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Sumas, Washington Weather Forecast
Sumas, Washington Weather
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Weather Forecast for Sumas, Washington : Whatcom County
Issued: 1:25 pm PST Dec 16, 2025 Latitude: 49.0001217 Longitude: -122.2648752 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Wednesday Thursday Friday Saturday Sunday Monday
100% chance of rain on This Afternoon 100% chance of rain on Tonight 90% chance of rain on Wednesday 100% chance of thunderstorms on Thursday 90% chance of thunderstorms on Friday Rain on Saturday Rain and Snow on Sunday Rain on Monday
High: 53°F Low: 40°F High: 46°F High: 47°F High: 43°F High: 42°F High: 43°F High: 44°F
Low: 40°F Low: 36°F Low: 35°F Low: 35°F Low: 36°F  
Rain Rain Rain Thunderstorms Thunderstorms Rain Rain and Snow Rain
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Current Conditions at
BELLINGHAM - (KBLI)
52°
Cloudy
Light Rain Mist
as of 2:18 PM PST
Rel. Humidity: 87%
Dew Point: 48°F
Visibility: 6 Miles
Pressure: 29.70 in.
Flight Rule: MVFR
Wind Data
9 MPH
180° South
Cloud Level(s): Broken at 1500ft, Solid Overcast at 4600ft
Current Conditions at
SKAGIT RGNL ARPT - (KBVS)
48°
Cloudy
Mist
as of 2:15 PM PST
Rel. Humidity: 100%
Dew Point: 48°F
Visibility: 4 Miles
Pressure: 29.73 in.
Flight Rule: MVFR
Wind Data
3 MPH
070° East
Cloud Level(s): Solid Overcast at 1200ft
Current Conditions at
FRIDAY HARBOR - (KFHR)
46°
Cloudy
Light Rain Mist
as of 2:07 PM PST
Rel. Humidity: 100%
Dew Point: 46°F
Visibility: 5 Miles
Pressure: 29.71 in.
Flight Rule: MVFR
Wind Data
6 MPH
140° Southeast
Cloud Level(s): Scattered at 700ft, Scattered at 2000ft, Solid Overcast at 5500ft
100% chance of rain This Afternoon This Afternoon... Rain. High near 53. South wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

100% chance of rain Tonight Tonight... Rain, mainly before 5am. Low around 40. South southwest wind 18 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

90% chance of rain Wednesday Wednesday... Rain, mainly after noon. High near 46. Southwest wind 14 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

100% chance of rain Wednesday Night Wednesday Night... Rain. Low around 40. South wind 8 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

100% chance of thunderstorms Thursday Thursday... Rain before 4pm, then showers and possibly a thunderstorm after 4pm. High near 47. East southeast wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

90% chance of thunderstorms Thursday Night Thursday Night... Showers and possibly a thunderstorm before 10pm, then rain likely after 10pm. Low around 36. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

90% chance of thunderstorms Friday Friday... Rain likely, then showers and possibly a thunderstorm after 10am. High near 43. Chance of precipitation is 90%.

Rain on Friday Night Friday Night... Rain. Cloudy, with a low around 35.

Rain on Saturday Saturday... Rain. Cloudy, with a high near 42.

70% chance of rain & snow Saturday Night Saturday Night... Rain likely before 4am, then rain likely, possibly mixed with snow. Mostly cloudy, with a low around 35.

Rain and Snow on Sunday Sunday... Rain, possibly mixed with snow. Mostly cloudy, with a high near 43.

Rain on Sunday Night Sunday Night... Rain. Cloudy, with a low around 36.

Rain on Monday Monday... Rain. Mostly cloudy, with a high near 44.

Current Radar Image


Sun Almanac for Sumas, Washington
Sunrise: 07:58 AM
Sunset: 4:12 PM
Civil Sunrise:07:20 AM
Civil Sunset: 4:50 PM
Nautical Sunrise: 06:40 AM
Nautical Sunset: 5:30 PM
Astro Sunrise: 06:01 AM
Astro Sunset: 6:09 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.