FPUS52 KKEY 230800 ZFPKEY Zone Forecasts for the Florida Keys National Weather Service Key West FL 400 AM EDT Sun Aug 23 2026 FLZ076>078-232245- Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys- Including the communities of Key Largo, Marathon, and Key West 400 AM EDT Sun Aug 23 2026 .TODAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs near 90. Southeast to south winds near 5 mph. Chance of rain 20 percent. .TONIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower to mid 80s. East to southeast winds near 5 mph, increasing to 5 to 10 mph. Chance of rain 10 percent. .MONDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs near 90. East to southeast winds 5 to 10 mph, increasing to near 10 mph. Chance of rain 10 percent. .MONDAY NIGHT...Mostly clear with a slight chance of showers and thunderstorms. Lows in the lower to mid 80s. East to southeast winds 10 to 15 mph. Chance of rain 20 percent. .TUESDAY...Mostly sunny with a chance of showers and a slight chance of thunderstorms. Highs near 90. East to southeast winds 10 to 15 mph. Chance of rain 30 percent. .TUESDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms. Lows in the lower to mid 80s. Chance of rain 50 percent. .WEDNESDAY...Mostly cloudy with a chance of showers and thunderstorms. Highs near 90. Chance of rain 50 percent. .WEDNESDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 80s. Chance of rain 50 percent. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs near 90. Chance of rain 20 percent. .THURSDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. A chance of showers and thunderstorms. Lows in the lower 80s. Chance of rain 30 percent. .FRIDAY...Mostly sunny with a chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 30 percent. .FRIDAY NIGHT AND SATURDAY...Partly cloudy. A chance of showers and thunderstorms. Lows in the lower 80s. Highs in the lower 90s. Chance of rain 50 percent. $$ MJV