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Sumas, WA Weather Forecast

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Sumas, WA Weather Forecast

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Sumas WA weather - Clear - 50°F
Clear
50°F
Updated 1:07 am
Feels Like 49°F
Humidity 96%
Wind N 0 mph
Barometer  30.12 in
Dew Point 49°F
Sumas WA weather - Clear - 10°C
Clear
10°C
Updated 1:07 am
Feels Like 9°C
Humidity 96%
Wind N 0 km/h
Barometer  101.9 kPa
Dew Point 9°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 Patchy Fog Sumas, WA Weather - Wednesday Patchy Fog Sumas, WA Weather - Wednesday Night Mostly Clear Sumas, WA Weather - Thursday Sunny Sumas, WA Weather - Thursday Night Clear Sumas, WA Weather - Friday Sunny Sumas, WA Weather - Friday Night Mostly Clear 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 Partly Sunny
Patchy Fog Patchy Fog Mostly Clear Sunny Clear Sunny Mostly Clear Mostly Sunny Mostly Clear Mostly Sunny Partly Cloudy Partly Sunny
Lo: 50°FLo: 10°C Hi: 70°FHi: 21°C
 Lo: 50°FLo: 10°C Hi: 75°FHi: 24°C
 Lo: 53°FLo: 12°C Hi: 70°FHi: 21°C
 Lo: 51°FLo: 11°C Hi: 70°FHi: 21°C
 Lo: 51°FLo: 11°C Hi: 73°FHi: 23°C
 Lo: 51°FLo: 11°C Hi: 70°FHi: 21°C
POP = Probability of Precipitation.
Weather Outlook Updated: 236 PM PDT Tue Sep 15 2026 Sumas, WA Weather - WeatherWorld.com

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Issued: 835 PM PDT Tue Sep 15 2026

Aviation

... North to northeast flow aloft tonight as a low digs southward and weak ridging noses over the area. VFR conditions this evening with clearing skies. Winds will continue to ease, becoming light to calm through early Wednesday morning. Clearing skies, light surface winds, and subsidence aloft will allow for areas of valley fog to develop, with the greatest chances being at the usual fog prone locations. (OLM, PWT, PAE, HQM) Clear skies will takeover the IFR/LIFR conditions late Wednesd...