FPUS52 KKEY 220759 ZFPKEY Zone Forecasts for the Florida Keys National Weather Service Key West FL 359 AM EDT Sun Mar 22 2026 FLZ076>078-222300- Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys- Including the communities of Key Largo, Marathon, and Key West 359 AM EDT Sun Mar 22 2026 .TODAY...Mostly sunny. Highs in the upper 70s. Northeast to east winds 5 to 10 mph. .TONIGHT...Mostly clear. Lows in the upper 60s. Northeast winds 5 to 10 mph. .MONDAY...Mostly sunny. Highs in the upper 70s. Northeast winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the upper 60s. North to northeast winds 5 to 10 mph. .TUESDAY...Mostly sunny. Highs in the upper 70s. Northeast winds 5 to 10 mph. .TUESDAY NIGHT THROUGH FRIDAY...Mostly clear. Lows in the lower 70s. Highs near 80. .FRIDAY NIGHT...Partly cloudy. Lows in the lower 70s. .SATURDAY...Mostly sunny with a slight chance of showers. Highs in the upper 70s. Chance of rain 10 percent. $$