Weather forecast for 10 daysHalfmoon, MT

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 61°F
  • 30°F
Cloudy
Cloudy
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 11mphSW 228°
  • Humidity: 42%
  • UV index: 1
  • Sunrise: 8:00 am MDT
  • Sunset: 6:44 pm MDT
  • ▼
Today, on Saturday, October 17, expect persistent cloudiness.
The peak daytime temperature will touch an enjoyable 60.8°F, while the nighttime temperature will descend to a subzero 30.2°F.
Today, the predicted high will be higher and much closer to September's average high of 65.5°F than October's 48.4°F.
Sunrise was at 8:00 am and sunset will be at 6:44 pm; the daylight will last for 10h and 44min.

Sunday Oct 18, 2026

  • 59°F
  • 30°F
Sunny
Sunny
  • Precip. probability: 9%
  • Precipitation: 0"
  • Wind: 4mphE 88°
  • Humidity: 64%
  • UV index: 3
  • Sunrise: 8:01 am MDT
  • Sunset: 6:42 pm MDT
  • ▼
On Sunday, in Halfmoon, sunny conditions are also expected to continue.
Day and night temperatures will sharply contrast, oscillating between a refreshing 59°F and a subzero 30.2°F.
Tomorrow, the temperature will be higher and more consistent with September's typical high of 65.5°F than with October's 48.4°F.
Sunrise will be at 8:01 am and sunset at 6:42 pm; tomorrow's daylight will last for 10h and 41min.

10-day overview

Daily temperatures

Warmest period: Tuesday - Thursday 63°C.
Coldest day: Sunday 25.10. 45°C.

Chance of precipitation

Highest chance: Friday 46%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 61°F
  • 30°F
Cloudy
Cloudy
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 11mphSW 228°
  • Humidity: 42%
  • UV index: 1
  • Sunrise: 8:00 am MDT
  • Sunset: 6:44 pm MDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 59°F
  • 30°F
Sunny
Sunny
  • Precip. probability: 9%
  • Precipitation: 0"
  • Wind: 4mphE 88°
  • Humidity: 64%
  • UV index: 3
  • Sunrise: 8:01 am MDT
  • Sunset: 6:42 pm MDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 59°F
  • 34°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 3mphNE 40°
  • Humidity: 62%
  • UV index: 2
  • Sunrise: 8:03 am MDT
  • Sunset: 6:40 pm MDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 63°F
  • 32°F
AM Clouds / PM Sun
AM Clouds / PM Sun
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 4mphENE 77°
  • Humidity: 61%
  • UV index: 2
  • Sunrise: 8:04 am MDT
  • Sunset: 6:38 pm MDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 63°F
  • 36°F
Sunny
Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 6mphE 98°
  • Humidity: 62%
  • UV index: 2
  • Sunrise: 8:06 am MDT
  • Sunset: 6:36 pm MDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 63°F
  • 39°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 24%
  • Precipitation: 0.16"
  • Wind: 5mphE 94°
  • Humidity: 65%
  • UV index: 2
  • Sunrise: 8:07 am MDT
  • Sunset: 6:34 pm MDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 50°F
  • 28°F
Showers
Showers
  • Precip. probability: 46%
  • Precipitation: 0.08"
  • Wind: 8mphWSW 257°
  • Humidity: 84%
  • UV index: 2
  • Sunrise: 8:09 am MDT
  • Sunset: 6:33 pm MDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 46°F
  • 27°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 11%
  • Precipitation: 0"
  • Wind: 6mphSE 138°
  • Humidity: 72%
  • UV index: 2
  • Sunrise: 8:10 am MDT
  • Sunset: 6:31 pm MDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 45°F
  • 27°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 20%
  • Precipitation: 0"
  • Wind: 7mphENE 60°
  • Humidity: 68%
  • UV index: 2
  • Sunrise: 8:12 am MDT
  • Sunset: 6:29 pm MDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 46°F
  • 28°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 12%
  • Precipitation: 0"
  • Wind: 6mphENE 72°
  • Humidity: 70%
  • UV index: 2
  • Sunrise: 8:14 am MDT
  • Sunset: 6:27 pm MDT
  • ▼
Over the next ten days, a mix of primarily dull and occasionally clear and wet weather is anticipated.
Rainfall is predicted for Thursday and Friday.
The temperature will vary considerably in the coming days. Maximum temperatures are forecasted between 44.6°F and 62.6°F, while the nightly low temperatures will show also a considerable swing, as the lowest temperatures will be recorded between 26.6°F and 39.2°F.
Tuesday through Thursday, with the highest temperature of 62.6°F, will be the warmest days in Halfmoon; the coldest day will be next Sunday, with a maximum of 44.6°F.
Updated: Oct 17, 2026 @ 20:58:39 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Today, the sky will be blanketed in clouds.

Today, the maximum temperature will be 60.8°F, while the minimum temperature will be 30.2°F.
The maximum temperature today will be notably higher than the average highest temperature of 48.4°F in October. The lowest temperature today will be in line with the average low temperature.

On Saturday, in Halfmoon, sunrise was at 8:00 am and sunset will be at 6:44 pm (MDT).

In Halfmoon, today, there will be 10h and 44min of daylight.

Tomorrow, expect sunny weather with a crisp, clear sky.

Tomorrow, the maximum temperature in Halfmoon will be 59°F, while the minimum temperature will be 30.2°F.
Tomorrow, the highest temperature will be noticeably higher than the average maximum of 48.4°F in October. The lowest temperature will be in line with the average low of 30.7°F.

On Sunday, in Halfmoon, sunrise will be at 8:01 am and sunset at 6:42 pm (MDT).

In Halfmoon, the length of the day tomorrow will be 10h and 41min.