Weather Alert
Grassy Key Weather Warning NWS WEATHER ALERT FOR THE GRASSY KEY, FL AREA - SHORTTERM FORECAST Issued: 759 AM EDT Thu Sep 17 2026 Grassy Key Weather Warning

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Grassy Key, FL Weather - Hour by Hour Forecast

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Grassy Key, FL Weather - Hour by Hour Forecast

24 Hour Forecast

Current Conditions - Clear. Temperature is 83°F28°C, dew point 77°F25°C, humidity 82%. Wind direction is NE at 9 mph14 km/h with visibility of 10.00 mi16 km. Barometric pressure is 30.03 in1017 mb.
Today - Showers likely with a chance of thunderstorms. Highs in the upper 80s. East winds near 10 mph. Chance of rain 60%... Full Forecast
Tonight - Showers likely with a chance of thunderstorms. Lows in the lower 80s. East winds 5 to 10 mph. Chance of rain 60%... Full Forecast

Grassy Key Hourly Weather

24 Hour Forecast Scroll
Thu, Sep 17
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Grassy Key, FL Hourly Weather - Partly Cloudy - 8:00 AM Grassy Key, FL Hourly Weather - Partly Cloudy - 9:00 AM Grassy Key, FL Hourly Weather - Partly Cloudy - 10:00 AM Grassy Key, FL Hourly Weather - Partly Cloudy - 11:00 AM Grassy Key, FL Hourly Weather - Partly Cloudy - 12:00 PM Grassy Key, FL Hourly Weather - Cloudy - 1:00 PM Grassy Key, FL Hourly Weather - Cloudy - 2:00 PM Grassy Key, FL Hourly Weather - Cloudy - 3:00 PM Grassy Key, FL Hourly Weather - Mostly Cloudy - 4:00 PM Grassy Key, FL Hourly Weather - Mostly Cloudy - 5:00 PM Grassy Key, FL Hourly Weather - Mostly Cloudy - 6:00 PM Grassy Key, FL Hourly Weather - Mostly Cloudy - 7:00 PM Grassy Key, FL Hourly Weather - Mostly Cloudy - 8:00 PM Grassy Key, FL Hourly Weather - Mostly Cloudy - 9:00 PM Grassy Key, FL Hourly Weather - Cloudy - 10:00 PM Grassy Key, FL Hourly Weather - Cloudy - 11:00 PM Grassy Key, FL Hourly Weather - Cloudy - 12:00 AM Grassy Key, FL Hourly Weather - Cloudy - 1:00 AM Grassy Key, FL Hourly Weather - Cloudy - 2:00 AM Grassy Key, FL Hourly Weather - Cloudy - 3:00 AM Grassy Key, FL Hourly Weather - Mostly Cloudy - 4:00 AM Grassy Key, FL Hourly Weather - Mostly Cloudy - 5:00 AM Grassy Key, FL Hourly Weather - Mostly Cloudy - 6:00 AM Grassy Key, FL Hourly Weather - Cloudy - 7:00 AM
Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Cloudy Cloudy Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Cloudy
84°F29°C 85°F29°C 87°F31°C 88°F31°C 88°F31°C 89°F32°C 89°F32°C 89°F32°C 88°F31°C 88°F31°C 87°F31°C 86°F30°C 85°F29°C 85°F29°C 84°F29°C 84°F29°C 84°F29°C 83°F28°C 83°F28°C 83°F28°C 83°F28°C 83°F28°C 83°F28°C 83°F28°C
Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain
36% 36% 36% 36% 36% 36% 36% 23% 23% 23% 23% 23% 23% 35% 35% 35% 35% 35% 35% 33% 33% 33% 33% 33%
75°F24°C 75°F24°C 76°F24°C 76°F24°C 76°F24°C 76°F24°C 76°F24°C 76°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C
75% 72% 70% 68% 68% 66% 66% 66% 66% 66% 68% 70% 72% 72% 75% 75% 75% 77% 77% 77% 77% 77% 77% 77%
E E E E E E E E E E E E ENE ENE ENE ENE ENE ENE ENE ENE E E E E
7 mph 7 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 8 mph 6 mph 6 mph 6 mph 5 mph 5 mph 5 mph 5 mph
10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km
Hour (EDT)
Weather
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POP = Probability of Precipitation. ** Indicates missing data/values from KMTH model statistics.

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Prob Precip % = Probability of Precipitation.

Grassy Key 36 Hour Forecast

POP = Probability of Precipitation. ** Indicates missing data/values from model statistics.

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