Sumas, WA Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Sumas, WA in one place.
Mostly sunny, with a high near 65.
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: May 28, 2026 12:04 AM PDT.
The active forecast window currently covers May 30 to Jun 3, 2026 for Sumas, WA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 30 to Jun 3, 2026
- Latest sync
- May 28, 2026 12:04 AM PDT
- Forecast office
- SEW
- Source
- NOAA / NWS
Daily Outlook
This Week in Sumas
Tuesday looks like the warmest upcoming period in Sumas at 88 degrees F.
Saturday Night is the coolest period ahead with temperatures near 44 degrees F.
The strongest winds are forecast for Wednesday at about 2 to 9 mph ESE.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- May 28, 2026 12:04 AM PDT
- Coverage
- 5 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
Partly cloudy, with a low around 44.
Mostly sunny, with a high near 69.
Partly cloudy, with a low around 47.
Mostly sunny, with a high near 80.
Partly cloudy, with a low around 54.
Mostly sunny, with a high near 88.
A slight chance of rain after 11pm. Mostly cloudy, with a low around 57.
A slight chance of rain. Partly sunny, with a high near 83.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
May 30
|
Mostly Sunny
|
65°F |
5 to 8 mph
SW
|
|
Saturday Night
May 30
|
Partly Cloudy
|
44°F |
2 to 8 mph
S
|
|
Sunday
May 31
|
Mostly Sunny
|
69°F |
1 to 8 mph
SSW
|
|
Sunday Night
May 31
|
Partly Cloudy
|
47°F |
0 to 8 mph
S
|
|
Monday
Jun 1
|
Mostly Sunny
|
80°F |
0 to 7 mph
WNW
|
|
Monday Night
Jun 1
|
Partly Cloudy
|
54°F |
2 to 7 mph
NE
|
|
Tuesday
Jun 2
|
Mostly Sunny
|
88°F |
2 to 7 mph
N
|
|
Tuesday Night
Jun 2
|
Slight Chance Light Rain
|
57°F |
2 to 6 mph
WNW
|
|
Wednesday
Jun 3
|
Slight Chance Light Rain
|
83°F |
2 to 9 mph
ESE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Sumas.
