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Sumas WA Weather - Hazy - 64°F
Hazy
64°F
Updated 12:45 pm
Feels Like 61°F
Humidity 64%
Wind W 8 mph
Barometer  30.04 in
Dew Point 52°F
Sumas WA Weather - Hazy - 18°C
Hazy
18°C
Updated 12:45 pm
Feels Like 16°C
Humidity 64%
Wind W 13 km/h
Barometer  101.7 kPa
Dew Point 11°C
Sumas, WA Weather and Current Conditionssumas wa weather forecast

Sumas, WA Weather Forecast

Sumas Washington WeatherSumas, Washington Weather Weather Forecast
14 day API Sumas, WA weather forecast. Note. Our 7-day weather forecast for Sumas, Washington is our most reliable and accurate forecast. This model should only be used as a likely scenario. Forecasting more than 7 days is difficult.
Sumas, WA Weather Forecast Dated: 1245 PM Tue Sep 15 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and no major pressure swings will dominate.

Tuesday, September 15, 2026

Mid-Morning
Sumas Weather - 2026-09-15 - Morning - Overcast
54°F 12°C
Overcast
Mid-Afternoon
Sumas Weather - 2026-09-15 - Afternoon - Cloudy
69°F 20°C
Cloudy
Early-Evening
Sumas Weather - 2026-09-15 - Evening - Sunny
60°F 16°C
Sunny
Pleasant near 69°F 20°C, overcast in the morning, cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure.

Wednesday, September 16, 2026

Mid-Morning
Sumas Weather - 2026-09-16 - Morning - Sunny
58°F 14°C
Sunny
Mid-Afternoon
Sumas Weather - 2026-09-16 - Afternoon - Sunny
75°F 24°C
Sunny
Early-Evening
Sumas Weather - 2026-09-16 - Evening - Sunny
64°F 18°C
Sunny
Comfortable with temperatures reaching 75°F 24°C, sunny throughout the day, with steady humidity and barometric pressure falling.

Thursday, September 17, 2026

Mid-Morning
Sumas Weather - 2026-09-17 - Morning - Sunny
59°F 15°C
Sunny
Mid-Afternoon
Sumas Weather - 2026-09-17 - Afternoon - Sunny
77°F 25°C
Sunny
Early-Evening
Sumas Weather - 2026-09-17 - Evening - Sunny
62°F 17°C
Sunny
Enjoyable around 77°F 25°C, sunny throughout the day, with increasing humidity and steady pressure.

Friday, September 18, 2026

Mid-Morning
Sumas Weather - 2026-09-18 - Morning - Sunny
58°F 15°C
Sunny
Mid-Afternoon
Sumas Weather - 2026-09-18 - Afternoon - Sunny
73°F 23°C
Sunny
Early-Evening
Sumas Weather - 2026-09-18 - Evening - Sunny
61°F 16°C
Sunny
Mild temperatures up to 73°F 23°C, sunny throughout the day, with increasing humidity and steady pressure.

Saturday, September 19, 2026

Mid-Morning
Sumas Weather - 2026-09-19 - Morning - Overcast
57°F 14°C
Overcast
Mid-Afternoon
Sumas Weather - 2026-09-19 - Afternoon - Sunny
74°F 23°C
Sunny
Early-Evening
Sumas Weather - 2026-09-19 - Evening - Sunny
62°F 17°C
Sunny
Mild with a high of 74°F 23°C, overcast in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.

Sunday, September 20, 2026

Mid-Morning
Sumas Weather - 2026-09-20 - Morning - Sunny
58°F 14°C
Sunny
Mid-Afternoon
Sumas Weather - 2026-09-20 - Afternoon - Overcast
73°F 23°C
Overcast
Early-Evening
Sumas Weather - 2026-09-20 - Evening - Partly Cloudy
60°F 16°C
Partly Cloudy
Pleasant near 73°F 23°C, sunny in the morning, becoming cloudy through the afternoon and evening, with steady humidity and steady pressure.

Monday, September 21, 2026

Mid-Morning
Sumas Weather - 2026-09-21 - Morning - Sunny
56°F 13°C
Sunny
Mid-Afternoon
Sumas Weather - 2026-09-21 - Afternoon - Sunny
68°F 20°C
Sunny
Early-Evening
Sumas Weather - 2026-09-21 - Evening - Sunny
58°F 15°C
Sunny
Comfortable with temperatures reaching 68°F 20°C, cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds turning from the SSW to the S at 5 mph 8 km/h.

Tuesday, September 22, 2026

Mid-Morning
Sumas Weather - 2026-09-22 - Morning - Partly Cloudy
53°F 12°C
Partly Cloudy
Mid-Afternoon
Sumas Weather - 2026-09-22 - Afternoon - Cloudy
65°F 18°C
Cloudy
Early-Evening
Sumas Weather - 2026-09-22 - Evening - Sunny
56°F 14°C
Sunny
Cool with a high near 65°F 18°C, cloudy in the morning, becoming partly cloudy through the afternoon and evening, with steady humidity and steady pressure.

Wednesday, September 23, 2026

Mid-Morning
Sumas Weather - 2026-09-23 - Morning - Cloudy
57°F 14°C
Cloudy
Mid-Afternoon
Sumas Weather - 2026-09-23 - Afternoon - Sunny
72°F 22°C
Sunny
Early-Evening
Sumas Weather - 2026-09-23 - Evening - Sunny
62°F 17°C
Sunny
Mild temperatures up to 72°F 22°C, overcast in the morning, cloudy in the afternoon, and sunny this evening, with increasing humidity and barometric pressure falling.

Thursday, September 24, 2026

Mid-Morning
Sumas Weather - 2026-09-24 - Morning - Partly Cloudy
60°F 15°C
Partly Cloudy
Mid-Afternoon
Sumas Weather - 2026-09-24 - Afternoon - Overcast
71°F 22°C
Overcast
Early-Evening
Sumas Weather - 2026-09-24 - Evening - Light Fog
59°F 15°C
Light Fog
Mild with a high of 71°F 22°C, cloudy in the morning, becoming overcast through the afternoon and evening, with increasing humidity and barometric pressure falling.

Friday, September 25, 2026

Mid-Morning
Sumas Weather - 2026-09-25 - Morning - Scattered Showers
50°F 10°C
Scattered Showers
Mid-Afternoon
Sumas Weather - 2026-09-25 - Afternoon - Overcast
53°F 12°C
Overcast
Early-Evening
Sumas Weather - 2026-09-25 - Evening - Scattered Showers
52°F 11°C
Scattered Showers
Chilly near 53°F 12°C, scattered downpours possible, with lower humidity and steady pressure.

Saturday, September 26, 2026

Mid-Morning
Sumas Weather - 2026-09-26 - Morning - Scattered Showers
50°F 10°C
Scattered Showers
Mid-Afternoon
Sumas Weather - 2026-09-26 - Afternoon - Scattered Showers
57°F 14°C
Scattered Showers
Early-Evening
Sumas Weather - 2026-09-26 - Evening - Light Showers
52°F 11°C
Light Showers
Crisp with a high near 57°F 14°C, locally heavy downpours at times, with lower humidity and steady pressure.

Sunday, September 27, 2026

Mid-Morning
Sumas Weather - 2026-09-27 - Morning - Light Showers
49°F 9°C
Light Showers
Mid-Afternoon
Sumas Weather - 2026-09-27 - Afternoon - Scattered Showers
52°F 11°C
Scattered Showers
Early-Evening
Sumas Weather - 2026-09-27 - Evening - Partly Cloudy
50°F 10°C
Partly Cloudy
Brisk around 52°F 11°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure.

Monday, September 28, 2026

Mid-Morning
Sumas Weather - 2026-09-28 - Morning - Overcast
51°F 11°C
Overcast
Mid-Afternoon
Sumas Weather - 2026-09-28 - Afternoon - Sunny
63°F 17°C
Sunny
Early-Evening
Sumas Weather - 2026-09-28 - Evening - Sunny
53°F 12°C
Sunny
Mildly cool near 63°F 17°C, overcast in the morning, cloudy in the afternoon, and sunny this evening, with steady humidity and barometric pressure falling.

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Weather by the Numbers

Tue, 15th
Sumas WA Weather - Tuesday, Sep 15, 2026 - Patchy Rain Nearby
Hi: 70°F 21°C
Lo: 52°F 11°C
Sunrise 06:46 AM
Sunset 07:22 PM
Wind NNW 4 mph7 km/h
Dew Point 48°F9°C
uv Index 4
Barometric Pressure 30.06 in1018 mb
POP 14% *
Humidity 58%
Wed, 16th
Sumas WA Weather - Wednesday, Sep 16, 2026 - Sunny
Hi: 75°F 24°C
Lo: 48°F 9°C
Sunrise 06:47 AM
Sunset 07:20 PM
Wind NW 3 mph4 km/h
Dew Point 46°F8°C
uv Index 4
Barometric Pressure 30.15 in1021 mb
POP 1% *
Humidity 41%
Thu, 17th
Sumas WA Weather - Thursday, Sep 17, 2026 - Sunny
Hi: 77°F 25°C
Lo: 49°F 10°C
Sunrise 06:49 AM
Sunset 07:18 PM
Wind WNW 3 mph4 km/h
Dew Point 42°F6°C
uv Index 6
Barometric Pressure 30 in1016 mb
POP 1% *
Humidity 34%
Fri, 18th
Sumas WA Weather - Friday, Sep 18, 2026 - Sunny
Hi: 73°F 23°C
Lo: 50°F 10°C
Sunrise 06:50 AM
Sunset 07:15 PM
Wind WNW 3 mph5 km/h
Dew Point 48°F9°C
uv Index 6
Barometric Pressure 30.12 in1020 mb
POP 2% *
Humidity 48%
Sat, 19th
Sumas WA Weather - Saturday, Sep 19, 2026 - Sunny
Hi: 74°F 23°C
Lo: 51°F 10°C
Sunrise 06:52 AM
Sunset 07:13 PM
Wind W 3 mph5 km/h
Dew Point 50°F10°C
uv Index 6
Barometric Pressure 30.09 in1019 mb
POP 2% *
Humidity 50%
Sun, 20th
Sumas WA Weather - Sunday, Sep 20, 2026 - Partly Cloudy
Hi: 74°F 23°C
Lo: 50°F 10°C
Sunrise 06:53 AM
Sunset 07:11 PM
Wind W 3 mph5 km/h
Dew Point 49°F9°C
uv Index 6
Barometric Pressure 30.06 in1018 mb
POP 2% *
Humidity 47%
Mon, 21st
Sumas WA Weather - Monday, Sep 21, 2026 - Sunny
Hi: 69°F 20°C
Lo: 51°F 10°C
Sunrise 06:55 AM
Sunset 07:09 PM
Wind WSW 6 mph9 km/h
Dew Point 49°F10°C
uv Index 5
Barometric Pressure 30.09 in1019 mb
POP 3% *
Humidity 56%
Tue, 22nd
Sumas WA Weather - Tuesday, Sep 22, 2026 - Sunny
Hi: 65°F 18°C
Lo: 47°F 8°C
Sunrise 06:56 AM
Sunset 07:07 PM
Wind WSW 4 mph7 km/h
Dew Point 43°F6°C
uv Index 5
Barometric Pressure 30.27 in1025 mb
POP 3% *
Humidity 52%
Wed, 23rd
Sumas WA Weather - Wednesday, Sep 23, 2026 - Overcast
Hi: 72°F 22°C
Lo: 50°F 10°C
Sunrise 06:57 AM
Sunset 07:05 PM
Wind W 2 mph4 km/h
Dew Point 40°F5°C
uv Index 5
Barometric Pressure 30.24 in1024 mb
POP 7% *
Humidity 36%
Thu, 24th
Sumas WA Weather - Thursday, Sep 24, 2026 - Overcast
Hi: 73°F 23°C
Lo: 52°F 11°C
Sunrise 06:59 AM
Sunset 07:02 PM
Wind WSW 4 mph7 km/h
Dew Point 53°F12°C
uv Index 5
Barometric Pressure 29.91 in1013 mb
POP 7% *
Humidity 55%
Fri, 25th
Sumas WA Weather - Friday, Sep 25, 2026 - Patchy Rain Nearby
Hi: 54°F 12°C
Lo: 49°F 10°C
Sunrise 07:00 AM
Sunset 07:00 PM
Wind E 1 mph2 km/h
Dew Point 49°F9°C
uv Index 3
Barometric Pressure 29.85 in1011 mb
POP 29% *
Humidity 89%
Sat, 26th
Sumas WA Weather - Saturday, Sep 26, 2026 - Patchy Rain Nearby
Hi: 58°F 14°C
Lo: 45°F 7°C
Sunrise 07:02 AM
Sunset 06:58 PM
Wind NE 4 mph6 km/h
Dew Point 45°F7°C
uv Index 3
Barometric Pressure 29.88 in1012 mb
POP 23% *
Humidity 73%
Sun, 27th
Sumas WA Weather - Sunday, Sep 27, 2026 - Patchy Rain Nearby
Hi: 55°F 13°C
Lo: 44°F 7°C
Sunrise 07:03 AM
Sunset 06:56 PM
Wind SSW 4 mph6 km/h
Dew Point 48°F9°C
uv Index 3
Barometric Pressure 30.18 in1022 mb
POP 45% *
Humidity 91%
Mon, 28th
Sumas WA Weather - Monday, Sep 28, 2026 - Overcast
Hi: 64°F 18°C
Lo: 46°F 8°C
Sunrise 07:05 AM
Sunset 06:54 PM
Wind SE 3 mph5 km/h
Dew Point 40°F4°C
uv Index 4
Barometric Pressure 30.18 in1022 mb
POP 11% *
Humidity 48%
* POP = Probability of Precipitation. Data for 12:00 PM.