573
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.

$$