FPUS62 KKEY 180802 SFTKEY STZ000-182100- Tabular State Forecast for the Florida Keys National Weather Service Key West FL 402 AM EDT Mon May 18 2026 ROWS INCLUDE... Daily predominant daytime weather 6AM-6PM Forecast temperatures...early morning low/daytime high Probability of precipitation nighttime 6PM-6AM/daytime 6AM-6PM - indicates temperatures below zero MM indicates missing data FCST FCST FCST FCST FCST FCST FCST Today Tue Wed Thu Fri Sat Sun May 18 May 19 May 20 May 21 May 22 May 23 May 24 ...Upper Keys... Key Largo Ptcldy Sunny Sunny Sunny Sunny Sunny Sunny /86 80/86 80/86 80/86 81/87 82/87 82/88 /40 40/40 40/30 20/20 20/20 20/20 40/40 ...Middle Keys... Marathon Sunny Sunny Sunny Sunny Sunny Sunny Sunny /87 79/86 80/86 80/87 80/87 81/88 82/88 /40 40/40 40/30 20/20 20/10 10/10 40/40 ...Lower Keys... Key West Sunny Sunny Sunny Sunny Sunny Sunny Sunny /91 80/91 80/90 80/91 81/92 82/93 82/92 /40 40/40 40/30 20/20 20/10 10/10 30/30 $$