FPUS52 KKEY 181958 ZFPKEY Zone Forecasts for the Florida Keys National Weather Service Key West FL 358 PM EDT Mon May 18 2026 FLZ076>078-191000- Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys- Including the communities of Key Largo, Marathon, and Key West 358 PM EDT Mon May 18 2026 .TONIGHT...Partly to mostly cloudy with a chance of showers and a slight chance of thunderstorms. Breezy. Lows near 80. East to southeast winds 15 to 20 mph. Chance of rain 40 percent. .TUESDAY...Partly cloudy with a chance of showers and a slight chance of thunderstorms. Breezy. Highs in the upper 80s. East winds 15 to 20 mph. Chance of rain 40 percent. .TUESDAY NIGHT...Partly cloudy with a chance of showers and a slight chance of thunderstorms. Breezy in the evening. Lows near 80. East winds 15 to 20 mph, decreasing to near 15 mph. Chance of rain 30 percent. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs near 90. East winds near 15 mph, decreasing to 10 to 15 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly clear with a slight chance of showers and thunderstorms. Lows near 80. East winds 10 to 15 mph. Chance of rain 20 percent. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. .THURSDAY NIGHT AND FRIDAY...Mostly clear with a slight chance of showers. Lows in the lower 80s. Highs in the upper 80s. Chance of rain 10 percent. .FRIDAY NIGHT...Mostly clear with a slight chance of showers and thunderstorms. Lows in the lower 80s. Chance of rain 20 percent. .SATURDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 10 percent. .SATURDAY NIGHT AND SUNDAY...Partly cloudy with a chance of showers and a slight chance of thunderstorms. Breezy. Lows in the lower 80s. Highs in the upper 80s. Chance of rain 30 percent. .SUNDAY NIGHT...Partly cloudy with a chance of showers and a slight chance of thunderstorms. Breezy. Lows in the lower 80s. Chance of rain 40 percent. .MEMORIAL DAY...Mostly sunny with a slight chance of showers and thunderstorms. Breezy with highs in the upper 80s. Chance of rain 20 percent. $$