Marine Weather Net

Grassy Key, FL Weather Forecast




Grassy Key, Florida

 Lat: 24.72N, Lon: 81.05W

Current Conditions Updated: 853 AM EDT SAT OCT 10 2026

Mostly Clear
Temp: 85°F
  • Humidity:
  • 77%
  • Winds:
  • 10 MPH SSE
  • Gusts:
  • 17 MPH
  • Barometer:
  • 29.98 in.
  • Dewpoint:
  • 77°F
  • Heat index:
  • 95°F

  • Sunrise:
  • 7:18 AM EDT
  • Sunset:
  • 7:01 PM EDT
  • Moonrise:
  • 7:15 AM EDT
  • Moonset:
  • 6:55 PM EDT

TODAY

MOSTLY SUNNY
Hi: 89°F
Lo: 81°F
Precip: 30%

SUNDAY

MOSTLY SUNNY
Hi: 90°F
Lo: 81°F
Precip: 20%

COLUMBUS DAY

MOSTLY SUNNY
Hi: 90°F
Lo: 79°F
Precip: 10%

WEDNESDAY

MOSTLY SUNNY
Hi: 85°F
Lo: 79°F
Weather Forecast In Detail:
Forecast Issued: 400 AM EDT Sat Oct 10 2026

Today...Mostly sunny in the morning, then becoming partly cloudy in the afternoon. A slight chance of showers this morning, then a chance of showers and a slight chance of thunderstorms this afternoon. Highs in the upper 80s. Southeast to south winds near 15 mph, Decreasing to 10 to 15 mph. Chance of rain 30 percent.
Tonight...Partly cloudy with a chance of showers and a slight chance of thunderstorms. Lows in the lower 80s. Southeast winds 10 to 15 mph, increasing to near 15 mph. Chance of rain 50 percent.
Sunday...Mostly sunny with a slight chance of showers and thunderstorms. Highs near 90. Southeast winds 10 to 15 mph, becoming east and Decreasing to 5 to 10 mph. Chance of rain 20 percent.
Sunday Night...Mostly clear with a slight chance of showers and thunderstorms. Lows in the lower 80s. Northeast to east winds near 10 mph. Chance of rain 10 percent.
Columbus Day...Mostly sunny with a slight chance of showers and thunderstorms. Highs near 90. Northeast to east winds near 10 mph. Chance of rain 10 percent.
Monday Night...Mostly clear with a slight chance of showers and thunderstorms. Lows near 80. Chance of rain 20 percent.
Tuesday And Tuesday Night...Mostly clear. Highs in the upper 80s. Lows in the upper 70s.
Wednesday...Mostly sunny. Highs in the mid 80s.
Wednesday Night...Mostly clear with a slight chance of showers. Lows in the upper 70s. Chance of rain 20 percent.
Thursday And Thursday Night...Mostly clear. A chance of showers and a slight chance of thunderstorms. Highs in the mid 80s. Lows in the upper 70s. Chance of rain 30 percent.
Friday...Mostly sunny with a chance of showers and a slight chance of thunderstorms. Highs in the mid 80s. Chance of rain 40 percent.
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