FPUS56 KSGX 230734 ZFPSGX Zone Forecast Product for Extreme Southwest California National Weather Service San Diego CA 1234 AM PDT Sun Aug 23 2026 CAZ552-232100- Orange County Coastal Areas- Including the cities of Huntington Beach, Costa Mesa, Newport Beach, Laguna Beach, and San Clemente 1234 AM PDT Sun Aug 23 2026 ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Mostly sunny. Highs 78 to 83 at the beaches to 87 to 92 farther inland and near higher coastal terrain. Light winds becoming west 10 mph this afternoon. .TONIGHT...Mostly clear. Lows 66 to 69. Areas of winds west to 10 mph in the evening becoming light. .MONDAY...Mostly sunny. Highs 78 to 83 at the beaches to 86 to 91 farther inland and near higher coastal terrain. Light winds becoming south 10 mph in the afternoon. .MONDAY NIGHT...Mostly clear in the evening...becoming partly cloudy overnight with patchy fog. Lows 66 to 70. Light winds. .TUESDAY...Partly cloudy with patchy fog in the morning... becoming mostly sunny. Highs 79 to 83 at the beaches to 87 to 92 farther inland and near higher coastal terrain. Light winds becoming west 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows around 70. .WEDNESDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 80 to 85 at the beaches to 87 to 92 farther inland and near higher coastal terrain. .WEDNESDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 69 to 72. .THURSDAY...Partly cloudy. Highs 81 to 86 at the beaches to 90 to 95 farther inland and near higher coastal terrain. .THURSDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 69 to 72. .FRIDAY...Partly cloudy. Highs 82 to 87 at the beaches to 91 to 96 farther inland and near higher coastal terrain. .FRIDAY NIGHT...Mostly clear. Lows 69 to 73. .SATURDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 82 to 87 at the beaches to 89 to 94 farther inland and near higher coastal terrain. $$ CAZ554-232100- Orange County Inland Areas- Including the cities of Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 1234 AM PDT Sun Aug 23 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Mostly sunny. Highs 87 to 92 towards the coast to 96 to 99 farther inland. Light winds becoming west 10 mph this afternoon. .TONIGHT...Mostly clear. Lows 65 to 70. Light winds. .MONDAY...Mostly sunny. Highs 87 to 91 towards the coast to 94 to 97 farther inland. Light winds becoming southwest 10 mph in the afternoon. .MONDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 65 to 71. Light winds. .TUESDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 87 to 92 towards the coast to 95 to 98 farther inland. Light winds becoming west 10 mph with gusts to 25 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 67 to 73. .WEDNESDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 89 to 93 towards the coast to 96 to 99 farther inland. .WEDNESDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 70 to 74. .THURSDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 92 to 96 towards the coast to 99 to 102 farther inland. .THURSDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 70 to 74. .FRIDAY...Partly cloudy. Highs 93 to 98 towards the coast to 100 to 103 farther inland. .FRIDAY NIGHT...Mostly clear. Lows 70 to 75. .SATURDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 91 to 95 towards the coast to 100 farther inland. $$ CAZ043-232100- San Diego County Coastal Areas- Including the cities of Oceanside, Vista, Carlsbad, Encinitas, Chula Vista, National City, and San Diego 1234 AM PDT Sun Aug 23 2026 ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Mostly sunny. Highs 78 to 83 near the coast to 88 to 93 inland. Areas of winds west to 10 mph. .TONIGHT...Mostly clear in the evening...becoming partly cloudy overnight with patchy fog. Lows 66 to 70. Areas of winds west to 10 mph in the evening becoming light. .MONDAY...Partly cloudy. Highs 78 to 83 near the coast to 86 to 91 inland. Areas of winds southwest to 10 mph. .MONDAY NIGHT...Mostly clear in the evening...becoming partly cloudy overnight with patchy fog. Lows 65 to 70. Light winds. .TUESDAY...Partly cloudy with patchy fog in the morning... becoming mostly sunny. Highs 77 to 82 near the coast to 86 to 91 inland. Light winds becoming west 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 67 to 71. .WEDNESDAY...Partly cloudy. Highs 80 to 85 near the coast to 88 to 93 inland. .WEDNESDAY NIGHT...Partly cloudy. Lows 69 to 73. .THURSDAY...Partly cloudy. Highs 81 to 86 near the coast to 92 to 96 inland. .THURSDAY NIGHT...Partly cloudy. Lows 69 to 73. .FRIDAY...Partly cloudy. Highs 82 to 87 near the coast to 93 to 97 inland. .FRIDAY NIGHT...Partly cloudy. Lows 69 to 74. .SATURDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 81 to 86 near the coast to 91 to 95 inland. $$ CAZ050-232100- San Diego County Valleys- Including the cities of Escondido, El Cajon, San Marcos, La Mesa, Santee, and Poway 1234 AM PDT Sun Aug 23 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Mostly sunny. Highs 91 to 96 in the western valleys to 98 to 103 near the foothills. Areas of winds west to 10 mph. .TONIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 66 to 72. Areas of winds west to 10 mph in the evening becoming light. .MONDAY...Mostly sunny in the morning...becoming partly cloudy. Highs 89 to 94 in the western valleys to 94 to 99 near the foothills. Areas of winds west to 10 mph. .MONDAY NIGHT...Mostly clear. Lows 65 to 70. Areas of winds southwest to 10 mph in the evening becoming light. .TUESDAY...Mostly sunny. Highs 90 to 95 in the western valleys to 96 to 101 near the foothills. Light winds becoming west 10 to 15 mph with gusts to 25 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 67 to 72. .WEDNESDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 91 to 96 in the western valleys to 98 to 103 near the foothills. .WEDNESDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 70 to 75. .THURSDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 95 to 100 in the western valleys to 99 to 104 near the foothills. .THURSDAY NIGHT...Mostly clear. Lows 70 to 75. .FRIDAY...Partly cloudy. Highs 96 to 101 in the western valleys to 100 to 105 near the foothills. .FRIDAY NIGHT...Mostly clear. Lows 70 to 75. .SATURDAY...Mostly sunny. Highs 94 to 99 in the western valleys to 99 to 104 near the foothills. $$ CAZ048-232100- San Bernardino and Riverside County Valleys-The Inland Empire- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, and Corona 1234 AM PDT Sun Aug 23 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Sunny. Highs 101 to 107. Light winds becoming west 10 to 15 mph with gusts to 25 mph this afternoon. .TONIGHT...Mostly clear. Lows 67 to 73. Areas of winds west to 10 mph in the evening becoming light. .MONDAY...Mostly sunny. Highs 99 to 105. Areas of winds east to 10 mph becoming west in the afternoon. .MONDAY NIGHT...Mostly clear. Lows66 to 71. Areas of winds west to 10 mph in the evening becoming light. .TUESDAY...Mostly sunny. Highs 101 to 108. Light winds becoming west 10 to 15 mph with gusts to 25 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 68 to 73. .WEDNESDAY...Mostly sunny. Highs 101 to 109. .WEDNESDAY NIGHT...Mostly clear. Lows 70 to 74. .THURSDAY...Mostly sunny. Highs 103 to 109. .THURSDAY NIGHT...Mostly clear. Lows 70 to 74. .FRIDAY...Partly cloudy. Hot. Highs 103 to 110. .FRIDAY NIGHT...Mostly clear. Lows 70 to 74. .SATURDAY...Mostly sunny. Highs 102 to 108. $$ CAZ057-232100- Santa Ana Mountains and Foothills- 1234 AM PDT Sun Aug 23 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Sunny. Highs 94 to 103. Light winds becoming west 10 to 15 mph with gusts to 25 mph this afternoon. .TONIGHT...Mostly clear. Lows 65 to 75. Areas of winds southwest to 10 mph in the evening becoming light. .MONDAY...Mostly sunny. Highs 92 to 102. Areas of winds east to 10 mph becoming southwest 10 mph in the afternoon. .MONDAY NIGHT...Mostly clear. Lows 65 to 74. Areas of winds west to 10 mph in the evening becoming light. .TUESDAY...Sunny. Highs 94 to 104. Light winds becoming west 10 to 15 mph with gusts to 25 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 67 to 76. .WEDNESDAY...Mostly sunny. Highs 95 to 105. .WEDNESDAY NIGHT...Mostly clear. Lows 70 to 78. .THURSDAY...Mostly sunny. Highs 97 to 107. .THURSDAY NIGHT...Mostly clear. Lows 70 to 78. .FRIDAY...Partly cloudy. Highs 98 to 108. .FRIDAY NIGHT...Mostly clear. Lows 70 to 78. .SATURDAY...Mostly sunny. Highs 96 to 106. $$ CAZ055-232100- San Bernardino County Mountains- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, and Wrightwood 1234 AM PDT Sun Aug 23 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Mostly sunny. Highs 78 to 88 above 6000 feet to 87 to 97 below 6000 feet. Areas of winds south 10 to 15 mph. Gusts to 30 mph this afternoon. .TONIGHT...Mostly clear. Cooler. Lows 53 to 63 above 6000 feet to 62 to 72 below 6000 feet. Areas of winds south 10 to 15 mph. Gusts to 30 mph...becoming 25 mph overnight. .MONDAY...Mostly sunny in the morning...becoming partly cloudy. Highs 77 to 87 above 6000 feet to 87 to 96 below 6000 feet. Areas of winds south to 10 mph...becoming 10 to 15 mph in the afternoon. .MONDAY NIGHT...Partly cloudy in the evening...becoming mostly clear. Lows 53 to 63 above 6000 feet to 62 to 72 below 6000 feet. Areas of winds west to 10 mph. .TUESDAY...Mostly sunny. Highs 78 to 88 above 6000 feet to 88 to 97 below 6000 feet. Areas of winds north 10 mph becoming west in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 57 to 67. .WEDNESDAY...Mostly sunny. Highs 80 to 90 above 6000 feet to 89 to 99 below 6000 feet. .WEDNESDAY NIGHT...Mostly clear. Lows 58 to 68. .THURSDAY...Mostly sunny. Highs 79 to 89 above 6000 feet to 89 to 98 below 6000 feet. .THURSDAY NIGHT...Mostly clear. Lows 58 to 68. .FRIDAY...Partly cloudy. Highs 80 to 90 above 6000 feet to 90 to 99 below 6000 feet. .FRIDAY NIGHT...Mostly clear. Lows 58 to 68. .SATURDAY...Mostly sunny. Highs 80 to 90 above 6000 feet to 89 to 98 below 6000 feet. $$ CAZ056-232100- Riverside County Mountains- Including the city of Idyllwild-Pine Cove 1234 AM PDT Sun Aug 23 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Mostly sunny. Highs 90 to 100. Areas of winds south to 10 mph becoming west with gusts to 25 mph this afternoon. .TONIGHT...Mostly clear. Lows 59 to 69. Areas of winds west 10 to 15 mph with gusts to 25 mph becoming north overnight. .MONDAY...Mostly sunny in the morning...becoming partly cloudy. Highs 87 to 97. Areas of winds east to 10 mph becoming west 10 mph in the afternoon. .MONDAY NIGHT...Mostly clear. Lows 60 to 70. Areas of winds west 10 mph in the evening becoming light. .TUESDAY...Mostly sunny. Highs 89 to 99. Areas of winds northwest to 10 mph. .TUESDAY NIGHT...Mostly clear. Lows 61 to 71. .WEDNESDAY...Mostly sunny. Highs 91 to 101. .WEDNESDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 62 to 72. .THURSDAY...Mostly sunny. Highs 90 to 100. .THURSDAY NIGHT...Mostly clear. Lows 62 to 72. .FRIDAY...Partly cloudy. Highs 91 to 101. .FRIDAY NIGHT...Mostly clear. Lows 63 to 73. .SATURDAY...Mostly sunny. Highs 90 to 100. $$ CAZ058-232100- San Diego County Mountains- Including the cities of Julian and Pine Valley 1234 AM PDT Sun Aug 23 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Mostly sunny. Highs 93 to 101. Areas of winds south to 10 mph becoming southwest with gusts to 25 mph this afternoon. .TONIGHT...Mostly clear. Lows 64 to 74. Areas of winds west 10 to 15 mph with gusts to 25 mph...becoming to 10 mph overnight. .MONDAY...Mostly sunny in the morning, then partly cloudy with a slight chance of showers in the afternoon. Highs 90 to 98. Areas of winds east to 10 mph becoming west 10 mph in the afternoon. Chance of measurable precipitation 20 percent. .MONDAY NIGHT...Mostly clear. Lows 64 to 74. Areas of winds west to 10 mph in the evening becoming light. .TUESDAY...Mostly sunny. Highs 91 to 100. Areas of winds north to 10 mph becoming west with gusts to 25 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 64 to 74. .WEDNESDAY...Mostly sunny. Highs 93 to 102. .WEDNESDAY NIGHT...Mostly clear in the evening...becoming partly cloudy. Lows 67 to 77. .THURSDAY...Mostly sunny. Highs 94 to 102. .THURSDAY NIGHT...Mostly clear. Lows 67 to 77. .FRIDAY...Mostly sunny in the morning...becoming partly cloudy. Highs 95 to 103. .FRIDAY NIGHT...Partly cloudy in the evening...becoming mostly clear. Lows 67 to 77. .SATURDAY...Mostly sunny. Highs 94 to 102. $$ CAZ060-232100- Apple and Lucerne Valleys- Including the cities of Victorville, Hesperia, Apple Valley, and Lucerne Valley 1234 AM PDT Sun Aug 23 2026 ...EXTREME HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... .TODAY...Mostly sunny. Highs 101 to 108. Areas of winds west to 10 mph...becoming south 10 to 20 mph with gusts to 30 mph this afternoon. .TONIGHT...Mostly clear. Lows 67 to 76. Areas of winds west 10 to 15 mph with gusts to 25 mph becoming southwest overnight. .MONDAY...Mostly sunny in the morning...becoming partly cloudy. Highs 100 to 106. Areas of winds southeast to 10 mph becoming south with gusts to 30 mph in the afternoon. .MONDAY NIGHT...Mostly clear. Lows 68 to 77. Areas of winds west 10 to 15 mph. Gusts to 25 mph in the evening. .TUESDAY...Mostly sunny. Highs 101 to 107. Areas of winds west 10 mph. .TUESDAY NIGHT...Mostly clear. Lows 68 to 77. .WEDNESDAY...Mostly sunny. Highs 102 to 108. .WEDNESDAY NIGHT...Mostly clear. Lows 69 to 77. .THURSDAY...Mostly sunny. Highs 101 to 107. .THURSDAY NIGHT...Partly cloudy in the evening...becoming mostly clear. Lows 68 to 77. .FRIDAY...Partly cloudy in the morning...becoming mostly sunny. Highs 102 to 108. .FRIDAY NIGHT...Mostly clear. Lows 68 to 77. .SATURDAY...Mostly sunny. Highs 102 to 107. $$ CAZ065-232100- San Gorgonio Pass near Banning- 1234 AM PDT Sun Aug 23 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM PDT FRIDAY... .TODAY...Sunny, hot. Highs 106 to 109 through the pass to 111 to 115 in the northern Coachella Valley. Areas of winds west 10 to 15 mph with gusts to 25 mph becoming southeast with gusts to 30 mph this afternoon. .TONIGHT...Mostly clear. Not as warm. Lows around 77 through the pass to 84 to 87 in the northern Coachella Valley. Areas of winds west 10 to 20 mph with gusts to 35 mph becoming north with gusts to 30 mph overnight. .MONDAY...Mostly sunny. Hot. Highs around 105 through the pass to 110 in the northern Coachella Valley. Areas of winds east 10 mph becoming south with gusts to 25 mph in the afternoon. .MONDAY NIGHT...Mostly clear. Lows around 77 through the pass to 87 in the northern Coachella Valley. Areas of winds northwest 10 to 20 mph with gusts to 30 mph. .TUESDAY...Mostly sunny. Hot. Highs around 107 through the pass to 109 to 113 in the northern Coachella Valley. Areas of winds northwest 10 to 15 mph with gusts to 30 mph becoming south with gusts to 25 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 79 to 88. .WEDNESDAY...Mostly sunny. Very hot. Highs around 110 through the pass to 112 to 116 in the northern Coachella Valley. .WEDNESDAY NIGHT...Mostly clear. Lows 81 to 89. .THURSDAY...Mostly sunny. Hot. Highs around 108 through the pass to 110 to 113 in the northern Coachella Valley. .THURSDAY NIGHT...Mostly clear. Lows 81 to 89. .FRIDAY...Partly cloudy. Hot. Highs around 108 through the pass to 111 to 114 in the northern Coachella Valley. .FRIDAY NIGHT...Mostly clear. Breezy. Lows 81 to 89. .SATURDAY...Mostly sunny. Breezy, hot. Highs around 108 through the pass to 111 to 114 in the northern Coachella Valley. $$ CAZ061-232100- Coachella Valley- Including the cities of Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, and Coachella 1234 AM PDT Sun Aug 23 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM PDT FRIDAY... .TODAY...Sunny, hot. Highs around 114. Light winds becoming southeast 10 to 15 mph with gusts to 25 mph this afternoon. .TONIGHT...Partly cloudy in the evening...becoming mostly clear. Lows 83 to 86. Areas of winds north 10 to 15 mph with gusts to 25 mph becoming southeast overnight. .MONDAY...Partly cloudy in the morning...becoming mostly sunny. Hot. Highs around 110. Light winds becoming southeast 10 mph in the afternoon. .MONDAY NIGHT...Mostly clear. Lows 83 to 87. Areas of winds northwest to 10 mph. .TUESDAY...Sunny, hot. Highs 111 to 114. Areas of winds northwest to 10 mph becoming south 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 85 to 88. .WEDNESDAY...Mostly sunny. Very hot. Highs 113 to 116. .WEDNESDAY NIGHT...Mostly clear. Lows 86 to 90. .THURSDAY...Mostly sunny. Very hot. Highs 112 to 115. .THURSDAY NIGHT...Partly cloudy in the evening...becoming mostly clear. Lows 85 to 89. .FRIDAY...Partly cloudy in the morning...becoming mostly sunny. Very hot. Highs 113 to 116. .FRIDAY NIGHT...Mostly clear. Lows 86 to 90. .SATURDAY...Mostly sunny. Very hot. Highs 112 to 115. $$ CAZ062-232100- San Diego County Deserts- Including the city of Borrego Springs 1234 AM PDT Sun Aug 23 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM PDT FRIDAY... .TODAY...Mostly sunny. Very hot. Highs 112 to 116. Light winds becoming southeast 10 to 15 mph with gusts to 30 mph this afternoon. .TONIGHT...Partly cloudy in the evening...becoming mostly clear. Lows 81 to 87. Areas of winds west 10 to 15 mph with gusts to 25 mph...becoming to 10 mph overnight. .MONDAY...Mostly sunny. Hot. Highs 107 to 111. Areas of winds east to 10 mph in the morning becoming light. .MONDAY NIGHT...Mostly clear. Lows 83 to 89. Areas of winds west to 10 mph. .TUESDAY...Sunny, hot. Highs 110 to 114. Light winds becoming southeast 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 84 to 90. .WEDNESDAY...Mostly sunny. Very hot. Highs 112 to 116. .WEDNESDAY NIGHT...Mostly clear in the evening...becomingpartly cloudy. Lows 85 to 91. .THURSDAY...Mostly sunny. Very hot. Highs 112 to 116. .THURSDAY NIGHT...Partly cloudy in the evening...becoming mostly clear. Lows 86 to 91. .FRIDAY...Partly cloudy in the morning...becoming mostly sunny. Very hot. Highs 113 to 117. .FRIDAY NIGHT...Partly cloudy in the evening...becoming mostly clear. Lows 86 to 92. .SATURDAY...Mostly sunny. Very hot. Highs 112 to 117. $$