582
FNUS52 KKEY 180840
FWFKEY

Fire Weather Planning Forecast for the Florida Keys
National Weather Service Key West FL
440 AM EDT Fri Sep 18 2026

.Discussion...
An upper level low will move across the Florida peninsula through
the end of the week and into the eastern Gulf over the weekend,
which will bring a wet weather pattern across the Keys over the
coming days. Daily rain chances will remain well above normal
with rain chances peaking around 60% to 70% and RH values
bottoming out in the mid 60s in the afternoon and recover into the
80s overnight. Surface winds will be light to gentle out of the
east to northeast through the end of the week before before winds
shift to a more east to southeast direction over the weekend.

FLZ076>078-182330-
Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys-
Including the cities of Key Largo, Marathon, and Key West
440 AM EDT Fri Sep 18 2026

                      Today        Tonight      Sat

Cloud Cover           Pcldy        Pcldy        Pcldy
Chance Precip (%)     50           50           50
Chance of Thunder (%) 50           50           50
Weather Type          Tstms        Tstms        Tstms
Max/Min Temp          90           78           89
Min/Max RH %          66           92           66
Wind 20ft AM (mph)    Lgt/Var                   Lgt/Var
Wind 20ft PM (mph)    Lgt/Var      NE  5        Lgt/Var
Precip Duration       2            2            2
Precip Begin          6 AM         Continuing   Continuing
Precip End            Continuing   Continuing   Continuing
Precip Amount         0.12         0.13         0.18
Mixing Hgt(ft-agl)    2900         1200         2800
Transport Wnd (mph)   E  7         E 12         E  8
Dispersion Index      21           7            21
Max LVORI             4            5            5

Remarks...None.

$$

.FORECAST FOR DAYS 3 THROUGH 7...
.SATURDAY NIGHT...Mostly cloudy with a chance of showers and
thunderstorms. Lows around 80. East winds around 5 mph.
.SUNDAY...Mostly sunny with showers likely and a chance of
thunderstorms. Highs in the upper 80s. Southeast winds around
5 mph.
.SUNDAY NIGHT...Mostly cloudy with showers likely and a chance of
thunderstorms. Lows around 80. South winds around 5 mph.
.MONDAY...Mostly sunny with showers likely and a chance of
thunderstorms. Highs in the upper 80s. South winds around 5 mph.
.MONDAY NIGHT...Mostly cloudy with showers likely and a chance of
thunderstorms. Lows in the lower 80s. South winds around 5 mph.
.TUESDAY...Partly sunny with showers likely and a chance of
thunderstorms. Highs in the upper 80s. South winds around 5 mph.
.TUESDAY NIGHT...Mostly cloudy with showers likely and a chance
of thunderstorms. Lows around 80. Southeast winds around 5 mph.
.WEDNESDAY...Mostly cloudy with showers likely and a chance of
thunderstorms. Highs in the upper 80s. Southeast winds around
5 mph.
.WEDNESDAY NIGHT...Mostly cloudy with showers likely and a chance
of thunderstorms. Lows around 80. East 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.

$$