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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: 136 PM PST Thu Nov 05 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.
Tonight... Windy. Mostly cloudy in the evening, then a slight chance of rain after midnight. Cloudy with a chance of rain late in the night. Lows in the 40s. Southeast wind 15 to 30 mph.
Friday... Windy. Rain at times in the morning, then rain likely in the late morning and early afternoon. Rain at times late in the afternoon. Rainfall amounts a quarter to a half inch possible. Highs in the lower to mid 50s. Southeast wind 20 to 35 mph becoming south 20 to 30 mph in the afternoon. Gusts to 45 mph.
Friday Night... Breezy. Mostly cloudy with rain likely in the evening, then mostly cloudy with a chance of rain after midnight. Rainfall amounts a tenth to a quarter of an inch possible. Lows in the mid 40s to lower 50s. South wind 15 to 25 mph with gusts to 35 mph becoming southeast 10 to 20 mph after midnight.
Saturday... Breezy. Mostly cloudy with a chance of rain. Highs near 60. East wind to 10 mph increasing to 15 to 25 mph with gusts to 40 mph in the afternoon.
Saturday Night... Windy, rain. Rainfall amounts a half inch to one inch possible. Lows in the mid to upper 40s. Southeast wind 20 to 35 mph becoming south after midnight. Gusts to 50 mph.
Sunday... Windy. Mostly cloudy with rain at times in the morning, then mostly cloudy with a chance of rain in the afternoon. Highs in the lower to mid 50s.
Sunday Night... Partly cloudy with a slight chance of rain in the evening, then mostly cloudy after midnight. Lows near 40.
Monday... Mostly cloudy. A chance of rain in the afternoon. Highs in the lower to mid 50s.
Monday Night... Windy. Rain likely in the evening, then rain at times after midnight. Lows in the mid to upper 40s.
Tuesday... Windy. Rain at times. Highs in the mid to upper 50s.
Tuesday Night... Windy. Rain at times. Lows near 50.
Veterans Day... Windy. Cloudy with rain likely in the morning, then mostly cloudy with a chance of rain in the afternoon. Highs near 60.
Wednesday Night... Windy. Rain likely. Lows in the upper 40s.
POP = Probability of Precipitation
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