10-day forecast for Sumas, WA: 34° to 59°, with precipitation expected on 6 days. The table below breaks each day into morning, afternoon, evening and overnight.
59°
Best day: Monday, October 26
52° · 0.64 in
Worst day: Wednesday, October 28
Tap any day below to see morning, afternoon, evening and overnight.
Sun, 2558° / 43°0.44
Morning46°feels 42°
Afternoon57°feels 56°
Evening49°feels 47°
Overnight43°feels 39°
58 °
Sumas, Sunday, 25 October
Rain. High 58°, low 43°.
Pressure29.97 inHg
Wind9.4 mph E
Humidity79%
Visibility6.2 mi
Dew point46°
Mon, 2659° / 46°0.04
Morning47°feels 46°
Afternoon58°feels 57°
Evening49°feels 49°
Overnight47°feels 43°
59 °
Sumas, Monday, 26 October
Light rain. High 59°, low 46°.
Pressure30.03 inHg
Wind1.5 mph SW
Humidity81%
Visibility6.2 mi
Dew point48°
Tue, 2754° / 43°0.31
Morning43°feels 43°
Afternoon53°feels 52°
Evening50°feels 50°
Overnight45°feels 45°
54 °
Sumas, Tuesday, 27 October
Rain. High 54°, low 43°.
Pressure30.03 inHg
Wind2.5 mph SW
Humidity86%
Visibility0.2 mi
Dew point46°
Wed, 2852° / 44°0.64
Morning45°feels 40°
Afternoon48°feels 46°
Evening49°feels 47°
Overnight46°feels 46°
52 °
Sumas, Wednesday, 28 October
Rain. High 52°, low 44°.
Pressure29.91 inHg
Wind4.4 mph NE
Humidity85%
Visibility6.2 mi
Dew point43°
Thu, 2947° / 41°0.2
Morning43°feels 42°
Afternoon45°feels 45°
Evening46°feels 46°
Overnight42°feels 41°
47 °
Sumas, Thursday, 29 October
Light rain. High 47°, low 41°.
Pressure29.91 inHg
Wind3.5 mph NE
Humidity92%
Visibility—
Dew point42°
Fri, 3049° / 35°0
Morning39°feels 39°
Afternoon44°feels 43°
Evening43°feels 43°
Overnight39°feels 39°
49 °
Sumas, Friday, 30 October
Partly cloudy. High 49°, low 35°.
Pressure30.00 inHg
Wind3.3 mph E
Humidity71%
Visibility—
Dew point35°
Sat, 3146° / 34°0
Morning37°feels 37°
Afternoon43°feels 43°
Evening42°feels 42°
Overnight40°feels 40°
46 °
Sumas, Saturday, 31 October
Light rain. High 46°, low 34°.
Pressure30.12 inHg
Wind3 mph NW
Humidity69%
Visibility—
Dew point32°
Sun, 0147° / 41°0.03
Morning43°feels 41°
Afternoon45°feels 44°
Evening46°feels 44°
Overnight46°feels 45°
47 °
Sumas, Sunday, 1 November
Light rain. High 47°, low 41°.
Pressure30.24 inHg
Wind5.4 mph NE
Humidity83%
Visibility—
Dew point40°
Mon, 0257° / 44°0.06
Morning48°feels 47°
Afternoon52°feels 50°
Evening51°feels 49°
Overnight47°feels 46°
57 °
Sumas, Monday, 2 November
Light rain. High 57°, low 44°.
Pressure29.97 inHg
Wind3.9 mph E
Humidity77%
Visibility—
Dew point44°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in Sumas, WA around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.