Marine Weather Net

Grassy Key, FL Weather Forecast




Grassy Key, Florida

 Lat: 24.72N, Lon: 81.05W

Current Conditions Updated: 1253 PM EDT WED JUN 17 2026

Mostly Clear
Temp: 87°F
  • Humidity:
  • 76%
  • Winds:
  • 7 MPH S
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.03 in.
  • Dewpoint:
  • 79°F
  • Heat index:
  • 101°F

  • Sunrise:
  • 6:33 AM EDT
  • Sunset:
  • 8:13 PM EDT
  • Moonrise:
  • 9:11 AM EDT
  • Moonset:
  • 11:05 PM EDT

TODAY

MOSTLY SUNNY
Hi: 89°F
Lo: 81°F
Precip: 10%

THURSDAY

MOSTLY SUNNY
Hi: 90°F
Lo: 81°F
Precip: 10%

JUNETEENTH

MOSTLY SUNNY
Hi: 89°F
Lo: 81°F
Precip: 10%

TUESDAY

MOSTLY SUNNY
Hi: 90°F
Precip: 10%
Weather Forecast In Detail:
Forecast Issued: 358 AM EDT Wed Jun 17 2026

Today...Mostly sunny. A slight chance of showers and thunderstorms, mainly this morning. Highs in the upper 80s. Southeast to south winds near 10 mph, Decreasing to 5 to 10 mph. Chance of rain 10 percent.
Tonight...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 80s. East to southeast winds 5 to 10 mph, becoming southeast to south near 10 mph. Chance of rain 10 percent.
Thursday...Mostly sunny with a slight chance of showers and thunderstorms. Highs near 90. Southeast winds near 10 mph. Chance of rain 10 percent.
Thursday Night...Mostly clear. Lows in the lower 80s. Southeast winds near 10 mph.
Juneteenth...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Southeast winds near 10 mph, Decreasing to 5 to 10 mph. Chance of rain 10 percent.
Friday Night And Saturday...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 80s. Highs in the upper 80s. Chance of rain 10 percent.
Saturday Night...Mostly clear. Lows in the lower 80s. Highs near 90.
Sunday...Mostly clear. Lows in the lower 80s. Highs near 90.
Monday...Mostly clear. Lows in the lower 80s. Highs near 90.
Monday Night...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 80s. Chance of rain 10 percent.
Tuesday...Mostly sunny with a slight chance of showers. Highs near 90. Chance of rain 10 percent.
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