10-day forecast for Sumas, WA: 41° to 63°, with precipitation expected on 3 days. The table below breaks each day into morning, afternoon, evening and overnight.
63°
Best day: Wednesday, October 21
54° · 0.4 in
Worst day: Monday, October 26
Tap any day below to see morning, afternoon, evening and overnight.
Sun, 1858° / 41°0
Morning41°feels 39°
Afternoon57°feels 55°
Evening50°feels 49°
Overnight43°feels 43°
58 °
Sumas, Sunday, 18 October
Overcast. High 58°, low 41°.
Pressure30.18 inHg
Wind2.1 mph N
Humidity76%
Visibility0.9 mi
Dew point47°
Mon, 1960° / 45°0
Morning45°feels 45°
Afternoon59°feels 58°
Evening51°feels 51°
Overnight47°feels 47°
60 °
Sumas, Monday, 19 October
Overcast. High 60°, low 45°.
Pressure29.97 inHg
Wind0.9 mph S
Humidity80%
Visibility6.0 mi
Dew point47°
Tue, 2062° / 42°0
Morning43°feels 43°
Afternoon62°feels 61°
Evening52°feels 52°
Overnight45°feels 45°
62 °
Sumas, Tuesday, 20 October
Mostly clear. High 62°, low 42°.
Pressure30.09 inHg
Wind1.3 mph NW
Humidity79%
Visibility4.1 mi
Dew point49°
Wed, 2163° / 46°0
Morning49°feels 49°
Afternoon57°feels 56°
Evening60°feels 59°
Overnight48°feels 48°
63 °
Sumas, Wednesday, 21 October
Clear. High 63°, low 46°.
Pressure29.97 inHg
Wind3.3 mph SW
Humidity73%
Visibility—
Dew point46°
Thu, 2258° / 43°0.02
Morning48°feels 48°
Afternoon53°feels 52°
Evening54°feels 53°
Overnight46°feels 44°
58 °
Sumas, Thursday, 22 October
Light rain. High 58°, low 43°.
Pressure29.97 inHg
Wind8.6 mph SW
Humidity87%
Visibility—
Dew point48°
Fri, 2356° / 42°0
Morning45°feels 45°
Afternoon51°feels 50°
Evening52°feels 50°
Overnight45°feels 43°
56 °
Sumas, Friday, 23 October
Overcast. High 56°, low 42°.
Pressure30.06 inHg
Wind4.4 mph E
Humidity69%
Visibility—
Dew point40°
Sat, 2450° / 46°0.17
Morning47°feels 45°
Afternoon49°feels 47°
Evening50°feels 49°
Overnight49°feels 48°
50 °
Sumas, Saturday, 24 October
Light rain. High 50°, low 46°.
Pressure29.74 inHg
Wind6.2 mph NE
Humidity90%
Visibility—
Dew point46°
Sun, 2559° / 44°0.02
Morning47°feels 46°
Afternoon54°feels 53°
Evening52°feels 51°
Overnight48°feels 48°
59 °
Sumas, Sunday, 25 October
Light rain. High 59°, low 44°.
Pressure29.94 inHg
Wind3.7 mph E
Humidity70%
Visibility—
Dew point44°
Mon, 2654° / 48°0.4
Morning48°feels 48°
Afternoon50°feels 48°
Evening50°feels 49°
Overnight48°feels 47°
54 °
Sumas, Monday, 26 October
Light rain. High 54°, low 48°.
Pressure29.68 inHg
Wind11.8 mph S
Humidity91%
Visibility—
Dew point47°
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.