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City of Sumas, WASumas, WA 7-Day Night Weather Forecast
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Sumas, WA Weather Forecast
Sumas, WA Weather Forecast Date: 236 AM PDT Thu Sep 17 2026
The area/counties/county of: Lowlands Of Western Whatcom County, including the cities of: Bellingham, Sumas, Blaine, and Lynden.or toggle through each period.
Today... Sunny. Highs in the upper 60s to mid 70s. North wind to 10 mph becoming west in the afternoon.
Tonight... Mostly clear. Lows in the upper 40s to mid 50s. Southwest wind to 10 mph becoming south after midnight.
Friday... Sunny. Highs in the mid 60s to lower 70s. Southeast wind to 10 mph becoming southwest in the afternoon.
Friday Night... Partly cloudy. Lows in the lower to mid 50s. Light wind becoming southeast to 10 mph after midnight.
Saturday... Partly sunny. Highs in the mid 60s to lower 70s. Southeast wind to 10 mph in the morning becoming light.
Saturday Night... Mostly clear. Lows in the lower 50s.
Sunday... Sunny. Highs in the upper 60s to mid 70s.
Sunday Night... Partly cloudy. Lows in the lower 50s.
Monday... Partly sunny. Highs in the upper 60s to mid 70s.
Monday Night... Partly cloudy. Lows in the lower 50s.
Tuesday... Partly sunny. Highs near 70.
Tuesday Night... Partly cloudy with a slight chance of rain. Lows in the lower 50s.
POP = Probability of Precipitation
Sumas Radar Loop
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