Marine Weather Net

Grassy Key, FL Weather Forecast




Grassy Key, Florida

 Lat: 24.72N, Lon: 81.05W

Current Conditions Updated: 800 PM EDT SUN SEP 20 2026

Light Rain
Temp: 79°F
  • Humidity:
  • 93%
  • Winds:
  • 3 MPH NNW
  • Gusts:
  • N/A MPH
  • Barometer:
  • 29.89 in.
  • Dewpoint:
  • 77°F
  • Heat index:
  • 83°F

  • Sunrise:
  • 7:10 AM EDT
  • Sunset:
  • 7:22 PM EDT
  • Moonrise:
  • 3:42 PM EDT
  • Moonset:
  • 1:28 AM EDT

TONIGHT

CHANCE OF T-STORM
Lo: 79°F
Precip: 60%

MONDAY

CHANCE OF T-STORM
Hi: 89°F
Lo: 80°F
Precip: 50%

TUESDAY

CHANCE OF T-STORM
Hi: 89°F
Lo: 80°F
Precip: 70%

THURSDAY

CHANCE OF T-STORM
Hi: 89°F
Lo: 80°F
Precip: 60%
Weather Forecast In Detail:
Forecast Issued: 537 PM EDT Sun Sep 20 2026

CORRECTED WEATHER VERBIAGE IN FIRST PERIOD
Tonight...Showers likely with a chance of thunderstorms. Lows in the upper 70s. South winds 5 to 10 mph, becoming southwest. Chance of rain 60 percent.
Monday...Partly cloudy with a chance of showers and thunderstorms. Highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 50 percent.
Monday Night...Showers likely with a chance of thunderstorms. Lows near 80. South winds 10 to 15 mph. Chance of rain 70 percent.
Tuesday...Showers likely with a chance of thunderstorms. Highs in the upper 80s. South winds 5 to 10 mph, becoming south to southeast. Chance of rain 70 percent.
Tuesday Night...Showers likely with a chance of thunderstorms. Lows near 80. Southeast winds near 10 mph, increasing to 10 to 15 mph. Chance of rain 70 percent.
Wednesday And Wednesday Night...Showers likely with a chance of thunderstorms. Highs in the upper 80s. Lows near 80. Chance of rain 70 percent.
Thursday...Showers likely with a chance of thunderstorms. Highs in the upper 80s. Chance of rain 60 percent.
Thursday Night...Mostly cloudy with a chance of showers and thunderstorms. Lows near 80. Chance of rain 50 percent.
Friday...Mostly sunny with a chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 40 percent.
Friday Night...Mostly cloudy with a chance of showers and thunderstorms. Lows near 80. Chance of rain 50 percent.
Saturday...Showers likely with a chance of thunderstorms. Highs in the upper 80s. Chance of rain 60 percent.
Saturday Night...Mostly cloudy with a chance of showers and thunderstorms. Lows near 80. Chance of rain 50 percent.
Sunday...Showers likely with a chance of thunderstorms. Highs in the upper 80s. Chance of rain 70 percent.
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