Weather forecast for 10 daysSumas, WA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 61°F
- 45°F
Partly Cloudy
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 5mphNNE 15°
- Humidity: 66%
- UV index: 2
- Sunrise: 7:34 am PDT
- Sunset: 6:13 pm PDT
- details ▼
Today, in Sumas, a mix of clouds and blue sky is expected.
A temperature range of an enjoyable 60.8°F to a chilly 44.6°F is forecasted.
Today, the anticipated high temperature will be relatively higher than the average October peak of 56.1°F.
Sunrise will be at 7:34 am and sunset at 6:13 pm; the daylight will last for 10h and 38min.
A temperature range of an enjoyable 60.8°F to a chilly 44.6°F is forecasted.
Today, the anticipated high temperature will be relatively higher than the average October peak of 56.1°F.
Sunrise will be at 7:34 am and sunset at 6:13 pm; the daylight will last for 10h and 38min.
10-day overview
Daily temperatures
Warmest day: Tuesday 66°C.
Minimum temperature: 54°C.
Minimum temperature: 54°C.
Chance of precipitation
Highest chance: Friday 40%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 61°F
- 45°F
Partly Cloudy
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 5mphNNE 15°
- Humidity: 66%
- UV index: 2
- Sunrise: 7:34 am PDT
- Sunset: 6:13 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 61°F
- 39°F
AM Clouds / PM Sun
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 5mphWSW 255°
- Humidity: 66%
- UV index: 2
- Sunrise: 7:36 am PDT
- Sunset: 6:11 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 66°F
- 43°F
Sunny
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 6mphN 2°
- Humidity: 64%
- UV index: 2
- Sunrise: 7:37 am PDT
- Sunset: 6:09 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 64°F
- 45°F
Mostly Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 4mphNW 312°
- Humidity: 63%
- UV index: 2
- Sunrise: 7:39 am PDT
- Sunset: 6:07 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 57°F
- 43°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 7mphWSW 239°
- Humidity: 76%
- UV index: 2
- Sunrise: 7:41 am PDT
- Sunset: 6:05 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 54°F
- 41°F
AM Showers
- Precip. probability: 40%
- Precipitation: 0"
- Wind: 6mphSSW 207°
- Humidity: 73%
- UV index: 2
- Sunrise: 7:42 am PDT
- Sunset: 6:04 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 54°F
- 43°F
PM Showers
- Precip. probability: 31%
- Precipitation: 0.08"
- Wind: 6mphNE 47°
- Humidity: 70%
- UV index: 2
- Sunrise: 7:44 am PDT
- Sunset: 6:02 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 55°F
- 41°F
Partly Cloudy
- Precip. probability: 21%
- Precipitation: 0.08"
- Wind: 9mphNE 43°
- Humidity: 64%
- UV index: 2
- Sunrise: 7:45 am PDT
- Sunset: 6:00 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 55°F
- 41°F
Partly Cloudy
- Precip. probability: 14%
- Precipitation: 0"
- Wind: 6mphNNE 24°
- Humidity: 64%
- UV index: 2
- Sunrise: 7:47 am PDT
- Sunset: 5:58 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 54°F
- 41°F
Partly Cloudy
- Precip. probability: 20%
- Precipitation: 0"
- Wind: 6mphNE 41°
- Humidity: 72%
- UV index: 2
- Sunrise: 7:48 am PDT
- Sunset: 5:56 pm PDT
- details ▼
For the next ten days, a combination of overcast, sunny and damp weather is predicted.
With minimal precipitation of 0.08", rain is expected on Saturday and next Sunday.
Temperature variation will be noticeable in the coming days. Forecast highs will fluctuate between 53.6°F and 66.2°F, while the lowest nightly temperature differences will be negligible, as the overnight low will fall between 39.2°F and 44.6°F.
The warmest day will be Tuesday, with a maximum of 66.2°F; with a maximum temperature of 53.6°F, Friday, Saturday and next Tuesday will be the coldest days in Sumas, Washington.
With minimal precipitation of 0.08", rain is expected on Saturday and next Sunday.
Temperature variation will be noticeable in the coming days. Forecast highs will fluctuate between 53.6°F and 66.2°F, while the lowest nightly temperature differences will be negligible, as the overnight low will fall between 39.2°F and 44.6°F.
The warmest day will be Tuesday, with a maximum of 66.2°F; with a maximum temperature of 53.6°F, Friday, Saturday and next Tuesday will be the coldest days in Sumas, Washington.
Updated: Oct 18, 2026 @ 08:23:51 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Sunday, intermittent cloud cover is expected, allowing for some sunshine.
Today, the maximum temperature will be 60.8°F, while the minimum temperature will be 44.6°F.
The highest temperature will be moderately higher than the average maximum of 56.1°F in October. The lowest temperature will be in line with the average low of 42.3°F.
The highest temperature will be moderately higher than the average maximum of 56.1°F in October. The lowest temperature will be in line with the average low of 42.3°F.
On Sunday, in Sumas, sunrise will be at 7:34 am and sunset at 6:13 pm (PDT).
In Sumas, today, there will be 10h and 38min of daylight.
