Charles Island Weather Forecast
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- 57
Rain Showers
- 48
- 57
Rain Showers
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- 57
Slight Chance Rain Showers
- 48
- 58
Partly Sunny
- 49
- 59
Partly Sunny
- 49
- 59
Partly Sunny
Today 18 May San Juan County
Mostly sunny. A slight chance of Showers in the morning. Highs in the upper 50s to mid 60s. West wind 10 to 20 Mph becoming southwest 10 to 15 Mph in the afternoon.
Tonight 18 May San Juan County
Mostly cloudy until early Morning, then a chance of Showers in the morning. Lows in the 40s. Southwest wind 10 to 15 Mph becoming southeast 10 to 20 Mph after midnight.
Charles Island Temperature Statistics
May Temperature
Friday Harbor Airport (7.5 miles)
Lowest 4 May, 2025
38.6 °FAverage May
59.5 °FHighest 6 May, 2025
85.6 °F
Climate (2020–Present)
Friday Harbor Airport (7.5 miles)
Average Low 2020–2025
44.3 °FAverage 2020–2025
51.6 °FAverage High 2020–2025
59.4 °F