FPUS52 KKEY 190800 ZFPKEY Zone Forecasts for the Florida Keys National Weather Service Key West FL 400 AM EDT Thu Mar 19 2026 FLZ076>078-192245- Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys- Including the communities of Key Largo, Marathon, and Key West 400 AM EDT Thu Mar 19 2026 .TODAY...Partly sunny with a slight chance of showers. Breezy with highs in the mid 70s. North to northeast winds 15 to 20 mph. Chance of rain 10 percent. .TONIGHT...Partly cloudy with a slight chance of showers. Breezy with lows in the mid 60s. North to northeast winds 15 to 20 mph. Chance of rain 10 percent. .FRIDAY...Mostly sunny with a slight chance of showers. Breezy with highs in the mid 70s. North to northeast winds 15 to 20 mph, decreasing to 10 to 15 mph. Chance of rain 10 percent. .FRIDAY NIGHT...Mostly clear. Lows in the upper 60s. Northeast winds 10 to 15 mph. .SATURDAY...Mostly sunny. Highs in the mid 70s. Northeast winds 10 to 15 mph. .SATURDAY NIGHT THROUGH TUESDAY...Mostly clear. Lows in the upper 60s. Highs in the upper 70s. .TUESDAY NIGHT AND WEDNESDAY...Mostly clear. A slight chance of showers. Lows near 70. Highs in the upper 70s. Chance of rain 10 percent. $$