10-day forecast for Sumas, WA: 36° to 65°, with precipitation expected on 4 days. The table below breaks each day into morning, afternoon, evening and overnight.
65°
Best day: Tuesday, October 20
46° · 0.63 in
Worst day: Saturday, October 24
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1961° / 47°0
Morning48°feels 48°
Afternoon61°feels 60°
Evening53°feels 52°
Overnight47°feels 47°
61 °
Sumas, Monday, 19 October
Clear. High 61°, low 47°.
Pressure29.97 inHg
Wind2.9 mph SW
Humidity74%
Visibility6.2 mi
Dew point48°
Tue, 2065° / 43°0
Morning44°feels 44°
Afternoon64°feels 63°
Evening54°feels 53°
Overnight47°feels 47°
65 °
Sumas, Tuesday, 20 October
Clear. High 65°, low 43°.
Pressure30.09 inHg
Wind2.1 mph NW
Humidity71%
Visibility6.2 mi
Dew point49°
Wed, 2165° / 47°0
Morning47°feels 47°
Afternoon65°feels 64°
Evening53°feels 53°
Overnight48°feels 48°
65 °
Sumas, Wednesday, 21 October
Clear. High 65°, low 47°.
Pressure29.94 inHg
Wind1.5 mph W
Humidity67%
Visibility6.2 mi
Dew point48°
Thu, 2257° / 46°0.04
Morning47°feels 47°
Afternoon53°feels 52°
Evening52°feels 51°
Overnight48°feels 48°
57 °
Sumas, Thursday, 22 October
Light rain. High 57°, low 46°.
Pressure29.94 inHg
Wind4.8 mph SW
Humidity76%
Visibility6.2 mi
Dew point46°
Fri, 2354° / 45°0.12
Morning48°feels 45°
Afternoon50°feels 46°
Evening50°feels 49°
Overnight46°feels 43°
54 °
Sumas, Friday, 23 October
Light rain. High 54°, low 45°.
Pressure30.24 inHg
Wind10 mph SW
Humidity90%
Visibility—
Dew point46°
Sat, 2446° / 41°0.63
Morning45°feels 41°
Afternoon44°feels 42°
Evening42°feels 39°
Overnight44°feels 42°
46 °
Sumas, Saturday, 24 October
Rain. High 46°, low 41°.
Pressure30.06 inHg
Wind7.3 mph NE
Humidity95%
Visibility—
Dew point44°
Sun, 2550° / 40°0.05
Morning46°feels 44°
Afternoon47°feels 45°
Evening48°feels 46°
Overnight41°feels 40°
50 °
Sumas, Sunday, 25 October
Light rain. High 50°, low 40°.
Pressure30.18 inHg
Wind6.1 mph NE
Humidity92%
Visibility—
Dew point44°
Mon, 2654° / 39°0
Morning41°feels 38°
Afternoon49°feels 46°
Evening49°feels 47°
Overnight39°feels 36°
54 °
Sumas, Monday, 26 October
Overcast. High 54°, low 39°.
Pressure30.15 inHg
Wind7.7 mph NE
Humidity58%
Visibility—
Dew point33°
Tue, 2754° / 36°0
Morning40°feels 36°
Afternoon48°feels 45°
Evening48°feels 46°
Overnight38°feels 37°
54 °
Sumas, Tuesday, 27 October
Mostly clear. High 54°, low 36°.
Pressure30.09 inHg
Wind6.7 mph NE
Humidity53%
Visibility—
Dew point30°
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.