Sumas, WA Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Sumas, WA in one place.
Mostly cloudy, with a high near 61. South southwest wind around 1 mph.
Local Weather Overview
This forecast page for Sumas, WA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 12, 2026 2:20 AM PDT.
The active forecast window currently covers Oct 13 to Oct 18, 2026 for Sumas, WA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 2:20 AM PDT
- Forecast office
- SEW
- Source
- NOAA / NWS
Daily Outlook
This Week in Sumas
Thursday looks like the warmest upcoming period in Sumas at 72 degrees F.
Saturday Night is the coolest period ahead with temperatures near 45 degrees F.
The strongest winds are forecast for Saturday at about 6 mph SSW.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 2:20 AM PDT
- Coverage
- 6 days
- Time zone
- America/Los_Angeles
- Forecast office
- SEW
- Radar station
- KATX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of rain after 11pm. Cloudy, with a low around 48. East southeast wind around 2 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of rain before 5pm. Mostly cloudy, with a high near 62. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Mostly cloudy, with a low around 48.
Mostly sunny, with a high near 72.
Partly cloudy, with a low around 50.
A slight chance of rain after 5pm. Mostly sunny, with a high near 72.
Rain likely. Mostly cloudy, with a low around 51.
Rain likely. Mostly cloudy, with a high near 63.
A chance of rain. Mostly cloudy, with a low around 45.
A chance of rain. Mostly cloudy, with a high near 60.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Mostly Cloudy
|
61°F |
1 mph
SSW
|
|
Tuesday Night
Oct 13
|
Chance Light Rain
|
48°F |
2 mph
ESE
|
|
Wednesday
Oct 14
|
Chance Light Rain
|
62°F |
2 mph
ENE
|
|
Wednesday Night
Oct 14
|
Mostly Cloudy
|
48°F |
0 to 3 mph
NE
|
|
Thursday
Oct 15
|
Mostly Sunny
|
72°F |
1 to 5 mph
NNE
|
|
Thursday Night
Oct 15
|
Partly Cloudy
|
50°F |
3 mph
NE
|
|
Friday
Oct 16
|
Mostly Sunny then Slight Chance Light Rain
|
72°F |
0 to 3 mph
NNE
|
|
Friday Night
Oct 16
|
Light Rain Likely
|
51°F |
5 mph
S
|
|
Saturday
Oct 17
|
Light Rain Likely
|
63°F |
6 mph
SSW
|
|
Saturday Night
Oct 17
|
Chance Light Rain
|
45°F |
1 to 5 mph
SSE
|
|
Sunday
Oct 18
|
Chance Light Rain
|
60°F |
2 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Sumas.
