FNUS52 KKEY 180848
FWFKEY

Fire Weather Planning Forecast for the Florida Keys
National Weather Service Key West FL
448 AM EDT Tue Aug 18 2026

.Discussion...
Warmer than normal weather continues while a Saharan Air Layer
lingers over the Florida Keys. Temperatures in the lower 90s
are likely across the island chain while dew points stay in the
mid to upper 70s. Relative humidity values are expected to
recover into the mid 80s during the overnight hours, but min RH
values will be able to drop into the lower 60s. Collapsing winds
suggest dispersion indices will be very low throughout the week.

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

                      Today        Tonight      Wed

Cloud Cover           Mclear       Mclear       Mclear
Chance Precip (%)     0            0            0
Chance of Thunder (%) 0            0            0
Weather Type          None         None         None
Max/Min Temp          93           81           93
Min/Max RH %          60           88           59
Wind 20ft AM (mph)    Lgt/Var                   NW  6
Wind 20ft PM (mph)    NW  5        NW  8        NW  5
Precip Duration
Precip Begin
Precip End
Precip Amount         0.00         0.00         0.00
Mixing Hgt(ft-agl)    2600         800          2700
Transport Wnd (mph)   NW  7        NW 10        W  7
Dispersion Index      15           10           20
Max LVORI             4            4            4

Remarks...None.

$$

.FORECAST FOR DAYS 3 THROUGH 7...
.WEDNESDAY NIGHT...Partly cloudy with a slight chance of showers
and thunderstorms. Lows in the lower 80s. West winds around
10 mph.
.THURSDAY...Mostly sunny with a slight chance of showers and
thunderstorms. Highs in the lower 90s. West winds around 5 mph.
.THURSDAY NIGHT...Partly cloudy. Lows in the lower 80s. Southwest
winds around 5 mph.
.FRIDAY...Sunny. Highs in the lower 90s. Southeast winds around
5 mph.
.FRIDAY NIGHT...Mostly clear with a slight chance of showers.
Lows in the lower 80s. South winds around 5 mph.
.SATURDAY...Sunny with a slight chance of showers and
thunderstorms. Highs around 90. Light winds.
.SATURDAY NIGHT...Partly cloudy with a slight chance of showers.
Lows in the lower 80s. Light winds.
.SUNDAY...Mostly sunny with a slight chance of showers and
thunderstorms. Highs around 90. Light winds.
.SUNDAY NIGHT...Partly cloudy with a slight chance of showers and
thunderstorms. Lows in the lower 80s. Northeast winds around
5 mph.
.MONDAY...Sunny with a slight chance of showers. Highs in the
lower 90s. East winds around 5 mph.

$$