FNUS52 KKEY 210933

FWFKEY



Fire Weather Planning Forecast for the Florida Keys

National Weather Service Key West FL

533 AM EDT Mon Sep 21 2026



.Discussion...

An upper level low will linger in the eastern Gulf waters into 

tonight but will finally lift away from the area on Tuesday. This

disturbance will continue to maintain a wet weather pattern 

across the Keys with scattered to numerous showers and 

thunderstorms possible at times through tonight. While this 

disturbance will finally departs the area on Tuesday, weather 

conditions will remain unsettled across the Keys for much of the 

week as tropical moisture from the Caribbean is expected to spread

into the area, bringing rain chances as high as 80% by Wednesday.

Surface winds will be mainly light to gentle mostly out of the 

southeast to south this week but will become more northerly by 

the end of the week in the wake of a weak cold front that moves 

through the area.



FLZ076>078-212330-

Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys-

Including the cities of Key Largo, Marathon, and Key West

533 AM EDT Mon Sep 21 2026



                      Today        Tonight      Tue          



Cloud Cover           Pcldy        Pcldy        Pcldy        

Chance Precip (%)     60           60           70           

Chance of Thunder (%) 50           50           50           

Weather Type          Tstms        Tstms        Tstms        

Max/Min Temp          89           78           89           

Min/Max RH %          67           90           69           

Wind 20ft AM (mph)    S  8                      S  8         

Wind 20ft PM (mph)    S  7         S  7         S  7         

Precip Duration       8            9            9            

Precip Begin          6 AM         Continuing   Continuing   

Precip End            Continuing   Continuing   Continuing   

Precip Amount         0.28         0.23         0.20         

Mixing Hgt(ft-agl)    3000         800          2900         

Transport Wnd (mph)   SW 12        S 13         S 10         

Dispersion Index      30           13           23           

Max LVORI             4            4            4            



Remarks...None.



$$



.FORECAST FOR DAYS 3 THROUGH 7...

.TUESDAY NIGHT...Mostly cloudy with showers likely and a chance

of thunderstorms. Lows around 80. South winds around 10 mph. 

.WEDNESDAY...Showers and a chance of thunderstorms. Highs in the

upper 80s. South winds around 5 mph. 

.WEDNESDAY NIGHT...Mostly cloudy with showers likely and a chance

of thunderstorms. Lows in the upper 70s. South winds around

5 mph. 

.THURSDAY...Partly sunny with showers likely and a chance of

thunderstorms. Highs in the upper 80s. East winds around 5 mph. 

.THURSDAY NIGHT...Mostly cloudy with a chance of showers and

thunderstorms. Lows around 80. Southeast winds around 5 mph. 

.FRIDAY...Mostly sunny with a chance of showers and

thunderstorms. Highs in the upper 80s. Northwest winds around

5 mph. 

.FRIDAY NIGHT...Partly cloudy with a chance of showers and

thunderstorms. Lows around 80. East winds around 5 mph. 

.SATURDAY...Mostly sunny with showers likely and a chance of

thunderstorms. Highs in the upper 80s. North winds around 5 mph. 

.SATURDAY NIGHT...Mostly cloudy with a chance of showers and

thunderstorms. Lows in the upper 70s. North winds around 5 mph. 

.SUNDAY...Partly sunny with showers likely and a chance of

thunderstorms. Highs in the upper 80s. Northeast winds around

5 mph. 



$$