Weather forecast for 10 daysSun River, MT

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 73°F
  • 39°F
Partly Cloudy / Wind
Partly Cloudy / Wind
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 26mphSW 230°
  • Humidity: 20%
  • UV index: 3
  • Sunrise: 7:48 am MDT
  • Sunset: 6:35 pm MDT
  • ▼
On Saturday, October 17, moderate winds will accompany partly cloudy skies.
Temperatures will see a substantial oscillation, reaching a high of a warm 73.4°F and dropping to a low of a wintry 39.2°F.
The higher temperature of 73.4°F is more typical of September than October.
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: 10mphE 87°
  • Humidity: 52%
  • UV index: 3
  • Sunrise: 7:50 am MDT
  • Sunset: 6:33 pm MDT
  • ▼
On Sunday, in Sun River, a pleasant mix of sun and clouds will define the day.
The maximum temperature will be a breezy 60.8°F, while the minimum temperature will be a wintry 35.6°F.
The day’s highest temperature is anticipated to be relatively higher than the standard October average 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 45%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 73°F
  • 39°F
Partly Cloudy / Wind
Partly Cloudy / Wind
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 26mphSW 230°
  • Humidity: 20%
  • UV index: 3
  • 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: 10mphE 87°
  • 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 196°
  • 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: 8mphNW 324°
  • Humidity: 58%
  • UV index: 2
  • Sunrise: 7:53 am MDT
  • Sunset: 6:29 pm MDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 70°F
  • 45°F
Sunny
Sunny
  • Precip. probability: 7%
  • Precipitation: 0"
  • Wind: 11mphSSW 206°
  • Humidity: 54%
  • 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: 0.04"
  • Wind: 10mphSW 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: 45%
  • Precipitation: 0.16"
  • Wind: 14mphW 275°
  • Humidity: 72%
  • 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: 13%
  • Precipitation: 0"
  • Wind: 10mphSW 233°
  • Humidity: 60%
  • UV index: 2
  • Sunrise: 7:59 am MDT
  • Sunset: 6:22 pm MDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 41°F
  • 30°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 24%
  • Precipitation: 0"
  • Wind: 11mphNNW 334°
  • Humidity: 71%
  • 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: 9mphSW 236°
  • Humidity: 70%
  • UV index: 2
  • Sunrise: 8:02 am MDT
  • Sunset: 6:19 pm MDT
  • ▼
During the ten-day period, primarily overcast and occasionally mostly clear and rain-filled weather is predicted.
With a probability of 45%, rainfall is forecasted only for Friday. The precipitation will be light at 0.16".
Significant changes in temperature are expected in the upcoming period. The maximum temperature will vary between 41°F and 73.4°F, while the fluctuation in night temperatures will be also significant, as nighttime lows are forecast to fall between 30.2°F and 46.4°F.
Today is the warmest day, with a maximum temperature of 73.4°F; with a maximum temperature of 41°F, next Sunday and Monday will be the coldest days in Sun River.
Updated: Oct 17, 2026 @ 19:39:42 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Today, in Sun River, wind-swept clouds will drift across the sky, making for a partly cloudy and breezy day.

Today, the maximum temperature will be 73.4°F, while the minimum temperature will be 39.2°F.
Today, the highest temperature will be notably higher than the average maximum of 54.5°F in October. The lowest temperature today will be in line with the average low temperature.

On Saturday, in Sun River, sunrise was at 7:48 am and sunset will be at 6:35 pm (MDT).

In Sun River, the length of the day today will be 10h and 46min.

On Sunday, partly cloudy skies will persist, making for a mix of sun and clouds.

Tomorrow, the highest temperature will be 60.8°F, while the lowest 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. Tomorrow, the lowest temperature will be in line with the average low temperature.

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.