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As of 13:32 PDT

Weather in Sumas, WA

78°Current weather

Sumas, Saturday, 8 August, 13:32

Overcast. Feels like 78°. High 79°, low 58°.

Pressure30.06 inHg
Wind6.2 mph W
Humidity55%
Visibility6.2 mi
Dew point60°
Sun, 0978° / 52°0Overcast
78 °Overcast

Sumas, Sunday, 9 August

Overcast. High 78°, low 52°.

Pressure30.03 inHg
Wind4.4 mph W
Humidity49%
Visibility6.2 mi
Dew point51°
Mon, 1078° / 52°0Clear
78 °Clear

Sumas, Monday, 10 August

Clear. High 78°, low 52°.

Pressure30.06 inHg
Wind4.4 mph W
Humidity47%
Visibility6.2 mi
Dew point52°
Tue, 1178° / 54°0Clear
78 °Clear

Sumas, Tuesday, 11 August

Clear. High 78°, low 54°.

Pressure30.09 inHg
Wind4.4 mph W
Humidity46%
Visibility6.2 mi
Dew point53°
Wed, 1272° / 56°0Overcast
72 °Overcast

Sumas, Wednesday, 12 August

Overcast. High 72°, low 56°.

Pressure30.06 inHg
Wind3.6 mph SW
Humidity75%
Visibility6.2 mi
Dew point56°
Thu, 1374° / 55°0Overcast
74 °Overcast

Sumas, Thursday, 13 August

Overcast. High 74°, low 55°.

Pressure30.00 inHg
Wind3.1 mph W
Humidity58%
Visibility—
Dew point55°
Fri, 1483° / 54°0Clear
83 °Clear

Sumas, Friday, 14 August

Clear. High 83°, low 54°.

Pressure29.97 inHg
Wind6.7 mph W
Humidity37%
Visibility—
Dew point51°
Sat, 1580° / 57°0Overcast
80 °Overcast

Sumas, Saturday, 15 August

Overcast. High 80°, low 57°.

Pressure29.97 inHg
Wind5.4 mph SW
Humidity46%
Visibility—
Dew point54°
Sun, 1680° / 58°0Clear
80 °Clear

Sumas, Sunday, 16 August

Clear. High 80°, low 58°.

Pressure30.03 inHg
Wind5.8 mph W
Humidity40%
Visibility—
Dew point52°
Mon, 1783° / 59°0Overcast
83 °Overcast

Sumas, Monday, 17 August

Overcast. High 83°, low 59°.

Pressure30.03 inHg
Wind6.1 mph W
Humidity34%
Visibility—
Dew point49°
Tue, 1881° / 58°0Overcast
81 °Overcast

Sumas, Tuesday, 18 August

Overcast. High 81°, low 58°.

Pressure30.06 inHg
Wind5.7 mph W
Humidity36%
Visibility—
Dew point49°
Wed, 1963° / 59°0.06Light rain
63 °Light rain

Sumas, Wednesday, 19 August

Light rain. High 63°, low 59°.

Pressure30.09 inHg
Wind2.4 mph NE
Humidity97%
Visibility—
Dew point60°
Thu, 2079° / 57°0Overcast
79 °Overcast

Sumas, Thursday, 20 August

Overcast. High 79°, low 57°.

Pressure30.00 inHg
Wind6.5 mph W
Humidity49%
Visibility—
Dew point56°
Fri, 2181° / 59°0Mostly clear
81 °Mostly clear

Sumas, Friday, 21 August

Mostly clear. High 81°, low 59°.

Pressure30.03 inHg
Wind7.1 mph W
Humidity42%
Visibility—
Dew point54°
Sat, 2282° / 57°0Overcast
82 °Overcast

Sumas, Saturday, 22 August

Overcast. High 82°, low 57°.

Pressure30.00 inHg
Wind6.7 mph W
Humidity41%
Visibility—
Dew point54°
Sun, 2385° / 57°0Overcast
85 °Overcast

Sumas, Sunday, 23 August

Overcast. High 85°, low 57°.

Pressure29.91 inHg
Wind6 mph W
Humidity40%
Visibility—
Dew point55°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Sumas, WA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Sumas, WA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.