What is today's weather forecast for Sumas, WA?

Today's forecast for Sumas shows a high of 52 degrees and a low of 43 degrees Fahrenheit. Showers likely and possibly a thunderstorm.

What is the 7-day weather forecast for Sumas, WA?

The 7-day forecast for Sumas shows highs from 42 to 53 degrees and lows from 33 to 43 degrees Fahrenheit. Expect precipitation on 8 days with chances of 20% or higher.

Will it rain in Sumas, WA this week?

Yes, rain is possible in Sumas this week. Precipitation chances: Monday (90% chance), Tuesday (100% chance), Wednesday (90% chance), Thursday (100% chance), Friday (50% chance), Saturday (50% chance), Sunday (50% chance), Monday (50% chance).

How accurate is the Sumas weather forecast?

WeatherForYou provides highly accurate Sumas forecasts using National Weather Service data and current conditions from the nearest available weather stations, often miles closer than regional airports, for the most precise local forecasts.

Sumas, WA Weather Forecast and Current Conditions

WEATHER ALERTS - Special Weather Statement - Wind Advisory - Wind Advisory - Flood Watch

Current Conditions From Nearby Local Station

Switch to Metric Units

55°F
Feels Like 55°F

Humidity 65% Dew Point 43°F Wind SW 11 MPH Gusts 26 Barometer N/A

Visibility 1.2 mi.

Report from a MADIS/MESONET weather station 0.6 mi. SSW of central Sumas
at 4:32 PM Mon, Dec 15, 2025

Point Forecast at a Glance

MonDec 15

70%

TueDec 16

100%

WedDec 17

90%

ThuDec 18

100%

FriDec 19

50%

SatDec 20

50%

SunDec 21

50%

Jump to detailed forecast ↓

7-Day Temperature Trend

Week Ahead Summary

Cooling trend continues with high temperatures dropping from 52°F to 42°F. Unsettled weather expected with rain on most days, including one day with snow.

Climate Context

This week's forecast shows temperatures running 1°F above the historical average for December. Normal highs for this period are around 45°F with lows around 34°F.

This Date in Weather History

1987 - A major winter storm hit the Great Lakes Region, intensifying explosively as it crossed northern Illinois. High winds and heavy snow created blizzard conditions in southeastern Wisconsin. Winds gusted to 73 mph, and snowfall totals ranged up to 17 inches at LaFarge. The barometric pressure at Chicago IL dropped three quarters of an inch in six hours to 28.96 inches, a record low reading for December. Up to a foot of snow blanketed northern Illinois, and winds in the Chicago area gusted to 75 mph. O'Hare Airport in Chicago was closed for several hours, for only the fourth time in twenty years. High winds derailed train cars at Avon IN. Light winds and partly sunny skies were reported near the center of the storm, a feature typical of tropical storms.

Sumas, WA 7 Day Weather Forecast Details

Monday Dec 15

Day: Showers likely and possibly a thunderstorm. Mostly cloudy, with a steady temperature around 52. Breezy, with a southwest wind around 24 mph, with gusts as high as 40 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Night: Rain and thunderstorms. Low around 43. South southwest wind 13 to 18 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tuesday Dec 16

Day: Rain, mainly after 2pm. High near 53. South wind 9 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Night: Rain. Low around 41. Southwest wind around 17 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

Wednesday Dec 17

Day: Rain. High near 46. Southwest wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Night: Rain. Low around 39. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Dec 18

Day: Rain. High near 46. Chance of precipitation is 100%.

Night: Rain. Cloudy, with a low around 35.

Friday Dec 19

Day: Rain. Cloudy, with a high near 43.

Night: Rain. Cloudy, with a low around 35.

Saturday Dec 20

Day: Rain. Cloudy, with a high near 43.

Night: Rain likely, possibly mixed with snow. Mostly cloudy, with a low around 34.

Sunday Dec 21

Day: Rain likely, possibly mixed with snow. Mostly cloudy, with a high near 42.

Night: Rain likely, possibly mixed with snow. Mostly cloudy, with a low around 33.

Monday Dec 22

Day: Rain likely, possibly mixed with snow. Mostly cloudy, with a high near 43.

About Sumas, WA

Sumas (SOO-mas) is a city in Whatcom County, Washington, United States. It had a population of 1,583 as of the 2020 census. Sumas is located adjacent to the Canada–U.S. border and borders the city of Abbotsford, British Columbia. The Sumas–Huntingdon port of entry at the north end of State Route 9 operates 24 hours a day. Sumas shares Nooksack Valley School District with the cities of Nooksack and Everson. It is the northernmost settlement on Washington State Route 9.

Content from Wikipedia, licensed under CC BY-SA 3.0.

How We Provide Better Local Weather

Current conditions: We use the nearest available station to your location - including professional MESONET/MADIS and local weather stations - often miles closer than regional airports.

Forecasts: National Weather Service point forecasts predict for your specific area, not broad regional zones, making them far more relevant to your location.

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