Long Island Weather Forecast
- 54
- 63
Mostly Sunny
- 56
- 69
Mostly Sunny
- 58
- 68
Mostly Sunny
- 56
- 67
Mostly Sunny
- 54
- 63
Mostly Cloudy
- 54
- 62
Mostly Cloudy
- 53
- 61
Slight Chance Rain
Today 9 Aug San Juan County
Mostly sunny. Highs in the upper 60s to mid 70s. Light wind.
Tonight 9 Aug San Juan County
Mostly clear. Lows in the mid 50s to lower 60s. Light wind.
Long Island Temperature Statistics
August Temperature
Friday Harbor Airport (6.8 miles)
Lowest 7 August, 2025
50 °FAverage August
60.1 °FHighest 2 August, 2025
71.1 °F
Climate (2020–Present)
Friday Harbor Airport (6.8 miles)
Average Low 2020–2025
44.3 °FAverage 2020–2025
51.7 °FAverage High 2020–2025
59.5 °F