Marine Weather Net

Grassy Key, FL Weather Forecast




Grassy Key, Florida

 Lat: 24.72N, Lon: 81.05W

Current Conditions Updated: 653 AM EST TUE JAN 20 2026

Overcast
Temp: 59°F
  • Humidity:
  • 72%
  • Winds:
  • 16 MPH NNE
  • Gusts:
  • 29 MPH
  • Barometer:
  • 30.24 in.
  • Dewpoint:
  • 50°F
  • Heat index:
  • 59°F

  • Sunrise:
  • 7:09 AM EST
  • Sunset:
  • 5:58 PM EST
  • Moonrise:
  • 8:30 AM EST
  • Moonset:
  • 7:54 PM EST

TODAY

MOSTLY SUNNY
Hi: 71°F
Lo: 65°F

WEDNESDAY

PARTLY SUNNY
Hi: 75°F
Lo: 69°F
Precip: 10%

THURSDAY

PARTLY SUNNY
Hi: 79°F
Lo: 70°F
Precip: 30%

FRIDAY

PARTLY CLOUDY
Hi: 79°F
Lo: 67°F
Precip: 20%
Weather Forecast In Detail:
Forecast Issued: 400 AM EST Tue Jan 20 2026

Today...Partly sunny this morning, then becoming mostly sunny. Windy. Highs in the lower 70s. North to northeast winds 20 to 25 mph, becoming northeast.
Tonight...Partly cloudy and windy. Lows in the mid 60s. Northeast winds 20 to 25 mph, Decreasing to near 20 mph.
Wednesday...Partly sunny with a slight chance of showers. Breezy. Highs in the mid 70s. Northeast winds 15 to 20 mph, becoming northeast to east. Chance of rain 10 percent.
Wednesday Night...Mostly cloudy with a chance of showers. Breezy in the evening. Lows in the upper 60s. Northeast to east winds 15 to 20 mph, Decreasing to 10 to 15 mph. Chance of rain 30 percent.
Thursday...Partly sunny with a chance of showers. Highs in the upper 70s. Northeast winds near 10 mph. Chance of rain 30 percent.
Thursday Night...Mostly cloudy in the evening, then becoming partly cloudy. A slight chance of showers. Lows near 70. Chance of rain 20 percent.
Friday...Partly cloudy with a slight chance of showers. Highs in the upper 70s. Chance of rain 20 percent.
Friday Night...Mostly clear with a slight chance of showers. Lows in the lower 70s. Highs near 80. Chance of rain 10 percent.
Saturday...Mostly clear with a slight chance of showers. Lows in the lower 70s. Highs near 80. Chance of rain 10 percent.
Sunday...Mostly clear with a slight chance of showers. Lows in the lower 70s. Highs near 80. Chance of rain 10 percent.
Sunday Night...Mostly clear with a slight chance of showers. Lows in the mid to upper 60s. Chance of rain 10 percent.
Monday...Partly cloudy with a slight chance of showers. Highs in the mid 70s. Chance of rain 10 percent.
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