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San Juan County, WA Weather Forecast
San Juan County, WA Weather Forecast Date: 236 PM PDT Sun Sep 27 2026
The area/counties/county of: San Juan County, including the cities of: Friday Harbor, Eastsound, and Roche Harbor.or toggle through each period.
Tonight... Clear in the evening then becoming partly cloudy. Lows in the mid 40s to lower 50s. Light wind.
Monday... Mostly sunny. Highs in the upper 50s to mid 60s. South wind to 10 mph increasing to 10 to 15 mph in the afternoon.
Monday Night... Breezy. Cloudy in the evening, then a chance of rain after midnight. Cloudy with rain likely in the morning. Rainfall amounts a tenth to a quarter of an inch possible. Lows in the upper 40s to mid 50s. South wind to 10 mph with gusts to 20 mph increasing to southeast 15 to 25 mph with gusts to 35 mph after midnight.
Tuesday... Breezy. Rain in the morning, then rain likely in the afternoon. Rainfall amounts a quarter to a half inch possible. Highs in the upper 50s to mid 60s. Southeast wind 15 to 25 mph becoming south 10 to 20 mph in the afternoon, gusts to 35 mph in the morning.
Tuesday Night... Partly cloudy. Lows in the mid 40s to lower 50s. Southwest wind 10 to 20 mph becoming west to 10 mph after midnight.
Wednesday... Mostly sunny. Highs in the lower 60s.
Wednesday Night... Partly cloudy. Lows in the mid 40s to lower 50s.
Thursday... Partly sunny. Highs in the lower 60s.
Thursday Night... Partly cloudy. Lows near 50.
Friday... Partly sunny. Highs in the lower 60s.
Friday Night... Partly cloudy. Lows near 50.
Saturday... Mostly sunny. Highs in the lower 60s.
Saturday Night... Mostly clear. Lows near 50.
POP = Probability of Precipitation
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