FPUS52 KKEY 211957 ZFPKEY Zone Forecasts for the Florida Keys National Weather Service Key West FL 357 PM EDT Sat Mar 21 2026 FLZ076>078-221045- Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys- Including the communities of Key Largo, Marathon, and Key West 357 PM EDT Sat Mar 21 2026 .TONIGHT...Mostly clear. Lows in the mid to upper 60s. North to northeast winds near 10 mph. .SUNDAY...Mostly sunny. Highs in the upper 70s. Northeast to east winds 5 to 10 mph. .SUNDAY NIGHT...Mostly clear. Lows in the upper 60s. Northeast to east 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 THROUGH WEDNESDAY NIGHT...Mostly clear. Highs near 80. Lows near 70. .THURSDAY...Partly cloudy with a slight chance of showers. Highs near 80. Chance of rain 10 percent. .THURSDAY NIGHT...Mostly clear. Lows near 70. .FRIDAY THROUGH SATURDAY...Partly cloudy with a slight chance of showers. Highs near 80. Lows in the lower 70s. Chance of rain 10 percent. $$ BT/AP