10-day forecast for Sumas, WA: 42° to 67°, with precipitation expected on 1 day. The table below breaks each day into morning, afternoon, evening and overnight.
67°
Best day: Sunday, October 25
62° · 0.28 in
Worst day: Saturday, October 17
Tap any day below to see morning, afternoon, evening and overnight.
Sun, 1859° / 45°0
Morning45°feels 43°
Afternoon58°feels 56°
Evening50°feels 50°
Overnight47°feels 47°
59 °
Sumas, Sunday, 18 October
Overcast. High 59°, low 45°.
Pressure30.15 inHg
Wind3.1 mph NE
Humidity72%
Visibility1.4 mi
Dew point46°
Mon, 1960° / 48°0
Morning50°feels 49°
Afternoon59°feels 58°
Evening52°feels 51°
Overnight50°feels 50°
60 °
Sumas, Monday, 19 October
Overcast. High 60°, low 48°.
Pressure29.97 inHg
Wind0.4 mph N
Humidity81%
Visibility3.3 mi
Dew point48°
Tue, 2065° / 42°0
Morning42°feels 42°
Afternoon64°feels 63°
Evening53°feels 52°
Overnight46°feels 46°
65 °
Sumas, Tuesday, 20 October
Clear. High 65°, low 42°.
Pressure30.06 inHg
Wind2.9 mph NW
Humidity69%
Visibility6.2 mi
Dew point48°
Wed, 2164° / 46°0
Morning46°feels 46°
Afternoon64°feels 63°
Evening60°feels 60°
Overnight47°feels 47°
64 °
Sumas, Wednesday, 21 October
Clear. High 64°, low 46°.
Pressure29.94 inHg
Wind0.9 mph SW
Humidity69%
Visibility6.2 mi
Dew point48°
Thu, 2257° / 45°0
Morning49°feels 48°
Afternoon54°feels 53°
Evening54°feels 53°
Overnight48°feels 48°
57 °
Sumas, Thursday, 22 October
Mostly clear. High 57°, low 45°.
Pressure29.94 inHg
Wind7.9 mph SW
Humidity79%
Visibility—
Dew point46°
Fri, 2359° / 44°0.01
Morning49°feels 46°
Afternoon53°feels 51°
Evening54°feels 52°
Overnight44°feels 44°
59 °
Sumas, Friday, 23 October
Light rain. High 59°, low 44°.
Pressure30.18 inHg
Wind7.2 mph W
Humidity79%
Visibility—
Dew point45°
Sat, 2463° / 43°0
Morning47°feels 45°
Afternoon56°feels 53°
Evening55°feels 54°
Overnight47°feels 46°
63 °
Sumas, Saturday, 24 October
Overcast. High 63°, low 43°.
Pressure30.30 inHg
Wind5.1 mph NE
Humidity43%
Visibility—
Dew point32°
Sun, 2567° / 45°0
Morning50°feels 50°
Afternoon59°feels 57°
Evening59°feels 57°
Overnight50°feels 48°
67 °
Sumas, Sunday, 25 October
Overcast. High 67°, low 45°.
Pressure30.15 inHg
Wind3.8 mph N
Humidity42%
Visibility—
Dew point34°
Mon, 2665° / 48°0
Morning52°feels 51°
Afternoon59°feels 57°
Evening57°feels 56°
Overnight48°feels 48°
65 °
Sumas, Monday, 26 October
Overcast. High 65°, low 48°.
Pressure29.88 inHg
Wind2.4 mph E
Humidity47%
Visibility—
Dew point38°
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.