Weather forecast for 10 daysSimms, MT

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 72°F
  • 39°F
Partly Cloudy / Wind
Partly Cloudy / Wind
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 25mphSW 232°
  • Humidity: 20%
  • UV index: 3
  • Sunrise: 7:49 am MDT
  • Sunset: 6:36 pm MDT
  • ▼
On Saturday, October 17, partly cloudy skies with gusty winds are expected.
Temperatures are set to span a considerable range, with a high of a delightful 71.6°F and a low of a wintry 39.2°F.
A high of 71.6°F is expected, which resembles September's climate average of 70.5°F more than October's 54.5°F.
Sunrise was at 7:49 am and sunset will be at 6:36 pm; the daylight will last for 10h and 46min.

Sunday Oct 18, 2026

  • 61°F
  • 36°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 9mphE 97°
  • Humidity: 53%
  • UV index: 3
  • Sunrise: 7:51 am MDT
  • Sunset: 6:34 pm MDT
  • ▼
Tomorrow, on Sunday, October 18, high-altitude clouds may scatter across the sky, but the sun will still shine.
The temperature is expected to vary between a comfortable 60.8°F and an icy 35.6°F.
Tomorrow's temperature peak is set to be slightly warmer than the typical October high of 54.5°F.
Sunrise will be at 7:51 am and sunset at 6:34 pm; tomorrow's daylight will last for 10h and 43min.

10-day overview

Daily temperatures

Warmest day: today 72°C.
Coldest day: Sunday 25.10. 39°C.

Chance of precipitation

Highest chance: Friday 43%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 72°F
  • 39°F
Partly Cloudy / Wind
Partly Cloudy / Wind
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 25mphSW 232°
  • Humidity: 20%
  • UV index: 3
  • Sunrise: 7:49 am MDT
  • Sunset: 6:36 pm MDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 61°F
  • 36°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 9mphE 97°
  • Humidity: 53%
  • UV index: 3
  • Sunrise: 7:51 am MDT
  • Sunset: 6:34 pm MDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 68°F
  • 39°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 11mphSSW 199°
  • Humidity: 51%
  • UV index: 3
  • Sunrise: 7:52 am MDT
  • Sunset: 6:32 pm MDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 59°F
  • 36°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 8mphNNW 337°
  • Humidity: 58%
  • UV index: 2
  • Sunrise: 7:54 am MDT
  • Sunset: 6:30 pm MDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 70°F
  • 45°F
Sunny
Sunny
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 12mphSSW 205°
  • Humidity: 52%
  • UV index: 3
  • Sunrise: 7:55 am MDT
  • Sunset: 6:28 pm MDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 68°F
  • 45°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 11mphSSW 212°
  • Humidity: 51%
  • UV index: 2
  • Sunrise: 7:57 am MDT
  • Sunset: 6:27 pm MDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 50°F
  • 34°F
Showers
Showers
  • Precip. probability: 43%
  • Precipitation: 0.12"
  • Wind: 12mphW 274°
  • Humidity: 72%
  • UV index: 2
  • Sunrise: 7:58 am MDT
  • Sunset: 6:25 pm MDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 46°F
  • 30°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 13%
  • Precipitation: 0"
  • Wind: 9mphSW 227°
  • Humidity: 60%
  • UV index: 2
  • Sunrise: 8:00 am MDT
  • Sunset: 6:23 pm MDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 39°F
  • 30°F
AM Snow Showers
AM Snow Showers
  • Precip. probability: 32%
  • Precipitation: 0.08"
  • Wind: 11mphNNW 340°
  • Humidity: 71%
  • UV index: 2
  • Sunrise: 8:01 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: 10mphWSW 237°
  • Humidity: 71%
  • UV index: 2
  • Sunrise: 8:03 am MDT
  • Sunset: 6:20 pm MDT
  • ▼
And a mix of overcast, mostly clear, rain-soaked and snow-blanketed weather is anticipated.
With a probability of 43%, rainfall is expected only on Friday. The precipitation will be minimal at 0.12".
With a 32% probability, snowfall is forecasted only for next Sunday. The precipitation will be light at 0.12".
Expect a substantial fluctuation in daytime highs in the upcoming period. Forecast highs will fluctuate between 39.2°F and 71.6°F, while the lowest night temperatures will vary also significantly, as nighttime lows are forecast to fall between 30.2°F and 44.6°F.
Today is the warmest day, with a maximum temperature of 71.6°F; the lowest daytime temperature of the period will be reached on next Sunday, peaking at 39.2°F.
Updated: Oct 17, 2026 @ 20:02:40 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

On Saturday, expect brisk winds and partly cloudy conditions.

Today, the maximum temperature in Simms will be 71.6°F, while the minimum temperature will be 39.2°F.
The maximum temperature will be notably higher than the average highest temperature of 54.5°F in October. Today, the lowest temperature will be in line with the average low temperature.

On Saturday, in Simms, sunrise was at 7:49 am and sunset will be at 6:36 pm (MDT).

In Simms, today, there will be 10h and 46min of daylight.

Tomorrow, in Simms, moderate cloud cover will mix with sunshine throughout the day.

Tomorrow, the highest temperature will be 60.8°F, while the lowest temperature will be 35.6°F.
The highest temperature will be slightly warmer 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 Simms, sunrise will be at 7:51 am and sunset at 6:34 pm (MDT).

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