Grand Isle Weather Forecast
- 75
- 92
Thunderstorms Likely
- 76
- 93
Chance Thunderstorms
- 75
- 92
Rain Showers
- 77
- 90
Thunderstorms Likely
- 77
- 89
Thunderstorms Likely
- 76
- 89
Thunderstorms Likely
- 76
- 90
Chance Thunderstorms
Today 5 Sep Mainland Southern Brevard
Partly sunny. A chance of Showers and Thunderstorms late in the Morning, then Showers and Thunderstorms likely late in the afternoon and towards Sunset. Highs in the lower 90s. Southwest Winds around 5 Mph becoming southeast 5 to 10 Mph late in the afternoon and towards Sunset. Chance of rain 70 percent. Heat index Values up to 107.
Tonight 5 Sep Mainland Southern Brevard
Considerable cloudiness with Showers and Thunderstorms likely early in the Evening, then considerable cloudiness with a slight chance of Showers and Thunderstorms in the late evening and early morning. Partly cloudy late. Lows in the mid 70s. Southeast Winds 5 to 10 Mph becoming southwest in the late evening and overnight. Chance of rain 70 percent.
Grand Isle Temperature Statistics
September Temperature
Cocoa - Patrick Air Force Base (6.2 miles)
Lowest 1 September, 2026
79.9 °FAverage September
83.4 °FHighest 1 September, 2026
88 °F
Climate (2021–2026)
Cocoa - Patrick Air Force Base (6.2 miles)
Average Low 2021–2026
70 °FAverage 2021–2026
75.2 °FAverage High 2021–2026
81.3 °F