FOUS52 KKEY 181959 PFMKEY Point Forecast Matrices National Weather Service Key West FL 358 PM EDT Mon May 18 2026 FLZ078-190800- Key West-Monroe FL 24.55N 81.75W Elev. 3 ft 358 PM EDT Mon May 18 2026 Date 05/18/26 Tue 05/19/26 Wed 05/20/26 Thu EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 80 91 80 90 80 Temp 89 84 83 82 81 82 87 89 89 84 83 82 80 82 87 88 88 84 83 82 80 83 Dewpt 76 75 75 75 75 75 75 75 75 74 74 74 74 74 75 74 74 73 73 73 73 73 RH 66 74 77 79 82 79 68 64 64 72 74 77 82 77 68 63 63 70 72 74 79 72 Wind dir E E E E E E E E E E E E E E E E E E E E E E Wind spd 14 16 16 16 13 12 11 11 12 13 14 13 12 11 11 11 10 12 13 12 10 10 Clouds FW SC SC FW SC FW FW FW FW FW FW FW FW FW FW FW FW FW FW SC SC FW PoP 12hr 40 40 30 20 20 QPF 12hr 0.09 0 0.02 0 0 Rain shwrs C C C C C C C C C C C C C S S S S S S S S S Tstms S S S S S S S S S S S S S S S S S S S S S S Heat index 100 92 90 89 87 89 96 99 99 91 90 88 85 88 96 97 97 90 89 87 84 89 Max heat 102 90 89 99 102 90 88 98 98 89 89 Date 05/21 Fri 05/22/26 Sat 05/23/26 Sun 05/24/26 Mon 05/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 91 81 91 81 92 82 92 82 92 Temp 89 86 83 83 89 86 83 84 89 87 83 84 90 87 83 84 90 87 Dewpt 73 73 74 74 74 74 74 75 75 74 75 75 75 75 75 75 75 74 PWind dir E E E E E E E E E Wind char GN GN GN GN GN GN GN GN BZ Avg clouds FW FW FW SC FW FW FW FW FW FW FW SC SC FW SC SC SC SC PoP 12hr 20 10 5 10 10 20 20 40 20 Rain shwrs S S S S S S S S S S S S C C S S Tstms S S S S S S S S S S $$ FLZ077-190800- Marathon-Monroe FL 24.72N 81.04W Elev. 5 ft 358 PM EDT Mon May 18 2026 Date 05/18/26 Tue 05/19/26 Wed 05/20/26 Thu EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 79 86 80 86 80 Temp 85 83 82 82 81 82 84 85 85 83 82 82 80 82 84 85 85 83 83 82 81 82 Dewpt 75 75 75 75 75 75 75 75 75 75 74 74 74 74 74 74 73 73 73 73 73 73 RH 72 77 79 79 82 79 74 72 72 77 77 77 82 77 72 70 67 72 72 74 77 74 Wind dir E E E E E E E E E E E E E E E E E E E E E E Wind spd 14 16 16 16 13 12 11 11 12 13 13 13 12 11 11 11 11 12 13 12 10 10 Clouds SC SC SC SC SC SC SC SC FW SC FW FW SC SC FW FW FW FW FW SC SC FW PoP 12hr 40 40 30 20 20 QPF 12hr 0.05 0.02 0 0 0 Rain shwrs C C C C C C C C C C C C C S S S S S S S S S Tstms S S S S S S S S S S S S S S S S S S S S S S Heat index 94 90 89 89 87 89 92 94 94 90 88 88 85 88 91 93 92 89 89 87 86 87 Max heat 95 89 89 94 95 90 88 93 93 89 87 Date 05/21 Fri 05/22/26 Sat 05/23/26 Sun 05/24/26 Mon 05/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 87 80 87 81 88 81 88 81 88 Temp 85 84 82 83 85 85 83 83 86 85 83 83 86 85 84 83 86 86 Dewpt 73 73 74 74 74 74 74 75 75 75 75 75 75 75 75 75 75 75 PWind dir E E E E E E E E E Wind char GN GN GN GN GN GN GN GN GN Avg clouds FW FW FW SC FW FW FW FW FW FW FW SC SC SC SC SC SC SC PoP 12hr 20 10 10 20 20 30 30 40 20 Rain shwrs S S S S S S S S C C C C C C S S Tstms S S S S S S S S S S C C S S $$