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Sumas, WA Weather Forecast

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Sumas, WA Weather Forecast

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Sumas WA weather - Fog - 47°F
Fog
47°F
Updated 12:03 am
Feels Like 45°F
Humidity 100%
Wind N 0 mph
Barometer  30.03 in
Dew Point 47°F
Sumas WA weather - Fog - 8°C
Fog
8°C
Updated 12:03 am
Feels Like 7°C
Humidity 100%
Wind N 0 km/h
Barometer  101.7 kPa
Dew Point 8°C
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Sumas Weather Forecast

TONIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY
Sumas, WA Weather - Tonight Partly Cloudy Sumas, WA Weather - Wednesday Patchy Fog Sumas, WA Weather - Wednesday Night Patchy Fog Sumas, WA Weather - Thursday Patchy Fog Sumas, WA Weather - Thursday Night Chance Of Rain Sumas, WA Weather - Friday Chance Of Rain Sumas, WA Weather - Friday Night Partly Cloudy Sumas, WA Weather - Saturday Mostly Sunny Sumas, WA Weather - Saturday Night Mostly Clear Sumas, WA Weather - Sunday Mostly Sunny Sumas, WA Weather - Sunday Night Partly Cloudy Sumas, WA Weather - Monday Mostly Sunny
Partly Cloudy Patchy Fog Patchy Fog Patchy Fog Chance of Rain Chance of Rain Partly Cloudy Mostly Sunny Mostly Clear Mostly Sunny Partly Cloudy Mostly Sunny
Lo: 46°FLo: 8°C Hi: 60°FHi: 16°C
 Lo: 46°FLo: 8°C Hi: 60°FHi: 16°C
 Lo: 50°FLo: 10°C Hi: 65°FHi: 18°C
 Lo: 49°FLo: 9°C Hi: 66°FHi: 19°C
 Lo: 50°FLo: 10°C Hi: 70°FHi: 21°C
 Lo: 51°FLo: 11°C Hi: 67°FHi: 19°C
POP = Probability of Precipitation.
Weather Outlook Updated: 236 PM PDT Tue Sep 29 2026 Sumas, WA Weather - WeatherWorld.com

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Issued: 824 PM PDT Tue Sep 29 2026

Aviation

... Westerly flow aloft will continue into Wednesday with an upper ridge axis centered well south of the region. Post-frontal low level onshore flow will weaken overnight and become northerly on Wednesday. Weak convergence persists over central Puget Sound this evening producing a few showers and MVFR ceilings. Confidence in the overall forecast ceilings areawide overnight is not high. However, lighter surface winds and remnant low level moisture will favor the development of IFR or low ...