Block Island Weather Forecast
- 55
- 71
Mostly Cloudy
- 61
- 69
Slight Chance Rain Showers
- 63
- 70
Chance Rain Showers
- 64
- 71
Slight Chance Rain Showers
- 55
- 75
Mostly Sunny
- 56
- 65
Mostly Sunny
Today 15 Sep Block Island
Mostly sunny. Highs in the lower 70s. East Winds 5 to 10 Mph with Gusts up to 20 Mph.
Tonight 15 Sep Block Island
Mostly cloudy. Lows in the mid 50s. East Winds 5 to 10 Mph with Gusts up to 20 Mph.
Block Island Temperature Statistics
September Temperature
Block Island State Airport (0.6 miles)
Lowest 13 September, 2025
53.1 °FAverage September
64.7 °FHighest 6 September, 2025
75.9 °F
Climate (2020–Present)
Block Island State Airport (0.6 miles)
Average Low 2020–2025
47.1 °FAverage 2020–2025
52.4 °FAverage High 2020–2025
57.8 °F