Weather forecast for 10 daysSun River, MT

Weather forecast for the weekend

Saturday Oct 17, 2026

  • min.
  • 39°F
Partly Cloudy / Wind
Partly Cloudy / Wind
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 25mphWSW 248°
  • Humidity: 42%
  • UV index: 0
  • Sunrise: 7:48 am MDT
  • Sunset: 6:35 pm MDT
  • ▼
For the remainder of Saturday, expect blustery conditions under a sky filled with passing clouds.
The lowest forecasted temperature is a wintry 39.2°F.
Sunrise was at 7:48 am and sunset will be at 6:35 pm; the daylight will last for 10h and 46min.

Sunday Oct 18, 2026

  • 61°F
  • 36°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 9mphE 89°
  • Humidity: 52%
  • UV index: 3
  • Sunrise: 7:50 am MDT
  • Sunset: 6:33 pm MDT
  • ▼
Tomorrow, on Sunday, sunny moments will alternate with patchy cloud cover.
Expected temperature values will span from a comfortable 60.8°F down to a wintry 35.6°F.
Tomorrow, the maximum temperature is expected to be a couple of degrees higher than the common October peak of 54.5°F.
Sunrise will be at 7:50 am and sunset at 6:33 pm; tomorrow's daylight will last for 10h and 43min.

10-day overview

Daily temperatures

Warmest day: today 73°C.
Coldest period: Sunday - Monday 41°C.

Chance of precipitation

Highest chance: Friday 42%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • min.
  • 39°F
Partly Cloudy / Wind
Partly Cloudy / Wind
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 25mphWSW 248°
  • Humidity: 42%
  • UV index: 0
  • Sunrise: 7:48 am MDT
  • Sunset: 6:35 pm MDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 61°F
  • 36°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 9mphE 89°
  • Humidity: 52%
  • UV index: 3
  • Sunrise: 7:50 am MDT
  • Sunset: 6:33 pm MDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 68°F
  • 39°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 7mphSSW 195°
  • Humidity: 52%
  • UV index: 3
  • Sunrise: 7:51 am MDT
  • Sunset: 6:31 pm MDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 59°F
  • 37°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 7mphNW 325°
  • Humidity: 58%
  • UV index: 2
  • Sunrise: 7:53 am MDT
  • Sunset: 6:29 pm MDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 70°F
  • 46°F
Sunny
Sunny
  • Precip. probability: 7%
  • Precipitation: 0"
  • Wind: 11mphSSW 206°
  • Humidity: 53%
  • UV index: 3
  • Sunrise: 7:54 am MDT
  • Sunset: 6:28 pm MDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 68°F
  • 46°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0.08"
  • Wind: 11mphSW 215°
  • Humidity: 52%
  • UV index: 2
  • Sunrise: 7:56 am MDT
  • Sunset: 6:26 pm MDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 50°F
  • 36°F
Showers
Showers
  • Precip. probability: 42%
  • Precipitation: 0.12"
  • Wind: 13mphW 280°
  • Humidity: 74%
  • UV index: 2
  • Sunrise: 7:57 am MDT
  • Sunset: 6:24 pm MDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 46°F
  • 30°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 10%
  • Precipitation: 0"
  • Wind: 10mphSW 231°
  • Humidity: 59%
  • UV index: 2
  • Sunrise: 7:59 am MDT
  • Sunset: 6:22 pm MDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 41°F
  • 30°F
AM Snow Showers
AM Snow Showers
  • Precip. probability: 32%
  • Precipitation: 0.08"
  • Wind: 11mphNNW 336°
  • Humidity: 68%
  • UV index: 2
  • Sunrise: 8:00 am MDT
  • Sunset: 6:21 pm MDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 41°F
  • 32°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 13%
  • Precipitation: 0"
  • Wind: 10mphSW 233°
  • Humidity: 68%
  • UV index: 2
  • Sunrise: 8:02 am MDT
  • Sunset: 6:19 pm MDT
  • ▼
The weather will be unstable for the next ten days, and a mix of dull, sun-filled, rainy and snowy and cold weather is expected.
With a 42% probability, rainfall is forecasted only for Friday. Anticipated precipitation will be minimal at 0.12".
With a 32% probability, snowfall is forecasted only for next Sunday. Anticipated precipitation will be light at 0.12".
Expect a substantial fluctuation in daytime highs throughout the forecast window. Highs will range from 41°F to 69.8°F, while the difference in minimum temperatures will be also substantial, as nighttime lows are forecast to fall between 30.2°F and 46.4°F.
Wednesday is expected to be the warmest, reaching up to 69.8°F; the coldest days will be next Sunday and Monday, with a maximum of 41°F.
Updated: Oct 17, 2026 @ 21:01:06 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

On Sunday, the sky will feature a blend of clouds and sunshine.

Tomorrow, the maximum temperature will be 60.8°F, while the minimum temperature will be 35.6°F.
The highest temperature will be a few degrees higher than the average maximum of 54.5°F in October. The lowest temperature will be in line with the average low of 36.7°F.

On Sunday, in Sun River, sunrise will be at 7:50 am and sunset at 6:33 pm (MDT).

In Sun River, tomorrow, there will be 10h and 43min of daylight.