Weather forecast for 10 daysGarrison, MT
Weather forecast for the weekend
Sunday Oct 18, 2026
- 63°F
- 34°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 5mphESE 104°
- Humidity: 59%
- UV index: 3
- Sunrise: 7:53 am MDT
- Sunset: 6:39 pm MDT
- details ▼
Today, on Sunday, October 18, variable cloud cover will persist, but sunshine will break through.
The highest daytime temperature will touch a comfortable 62.6°F, creating a significant contrast with the expected nighttime low of a cold 33.8°F.
The day's peak of 62.6°F reflects September's seasonal pattern more than October's.
Sunrise will be at 7:53 am and sunset at 6:39 pm; the daylight will last for 10h and 46min.
The highest daytime temperature will touch a comfortable 62.6°F, creating a significant contrast with the expected nighttime low of a cold 33.8°F.
The day's peak of 62.6°F reflects September's seasonal pattern more than October's.
Sunrise will be at 7:53 am and sunset at 6:39 pm; the daylight will last for 10h and 46min.
10-day overview
Daily temperatures
Warmest day: tomorrow 70°C.
Coldest period: Sunday - Tuesday 45°C.
Coldest period: Sunday - Tuesday 45°C.
Chance of precipitation
Highest chance: Friday 68%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 63°F
- 34°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 5mphESE 104°
- Humidity: 59%
- UV index: 3
- Sunrise: 7:53 am MDT
- Sunset: 6:39 pm MDT
- details ▼
- Monday
- Oct 19, 2026
- 70°F
- 34°F
Mostly Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 7mphSSE 155°
- Humidity: 52%
- UV index: 3
- Sunrise: 7:54 am MDT
- Sunset: 6:37 pm MDT
- details ▼
- Tuesday
- Oct 20, 2026
- 64°F
- 34°F
Partly Cloudy
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 6mphE 85°
- Humidity: 55%
- UV index: 3
- Sunrise: 7:56 am MDT
- Sunset: 6:35 pm MDT
- details ▼
- Wednesday
- Oct 21, 2026
- 66°F
- 39°F
Mostly Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 4mphS 174°
- Humidity: 63%
- UV index: 3
- Sunrise: 7:57 am MDT
- Sunset: 6:34 pm MDT
- details ▼
- Thursday
- Oct 22, 2026
- 64°F
- 41°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 7mphS 184°
- Humidity: 66%
- UV index: 3
- Sunrise: 7:59 am MDT
- Sunset: 6:32 pm MDT
- details ▼
- Friday
- Oct 23, 2026
- 46°F
- 27°F
Showers
- Precip. probability: 68%
- Precipitation: 0.24"
- Wind: 12mphWNW 299°
- Humidity: 88%
- UV index: 2
- Sunrise: 8:00 am MDT
- Sunset: 6:30 pm MDT
- details ▼
- Saturday
- Oct 24, 2026
- 46°F
- 25°F
Partly Cloudy
- Precip. probability: 5%
- Precipitation: 0.12"
- Wind: 6mphW 274°
- Humidity: 65%
- UV index: 3
- Sunrise: 8:01 am MDT
- Sunset: 6:28 pm MDT
- details ▼
- Sunday
- Oct 25, 2026
- 45°F
- 27°F
Partly Cloudy
- Precip. probability: 16%
- Precipitation: 0"
- Wind: 7mphENE 61°
- Humidity: 71%
- UV index: 2
- Sunrise: 8:03 am MDT
- Sunset: 6:27 pm MDT
- details ▼
- Monday
- Oct 26, 2026
- 45°F
- 25°F
Partly Cloudy
- Precip. probability: 17%
- Precipitation: 0"
- Wind: 6mphNE 36°
- Humidity: 69%
- UV index: 2
- Sunrise: 8:04 am MDT
- Sunset: 6:25 pm MDT
- details ▼
- Tuesday
- Oct 27, 2026
- 45°F
- 25°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 7mphW 278°
- Humidity: 78%
- UV index: 2
- Sunrise: 8:06 am MDT
- Sunset: 6:24 pm MDT
- details ▼
Primarily overcast and occasionally sun-filled and damp weather is forecasted.
With a 68% probability, rainfall is expected only on Friday. Predicted precipitation will be light at 0.24".
The temperature will vary considerably over the next several days. Highs will range from 44.6°F to 69.8°F, while the nightly low temperatures will show also a considerable swing, as the minimum temperature is expected to range between 24.8°F and 41°F.
Monday is expected to be the warmest, reaching up to 69.8°F; with a maximum temperature of 44.6°F, next Sunday through next Tuesday will be the coldest days.
With a 68% probability, rainfall is expected only on Friday. Predicted precipitation will be light at 0.24".
The temperature will vary considerably over the next several days. Highs will range from 44.6°F to 69.8°F, while the nightly low temperatures will show also a considerable swing, as the minimum temperature is expected to range between 24.8°F and 41°F.
Monday is expected to be the warmest, reaching up to 69.8°F; with a maximum temperature of 44.6°F, next Sunday through next Tuesday will be the coldest days.
Updated: Oct 18, 2026 @ 07:19:18 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, in Garrison, clouds will come and go, but expect bright periods in between.
Today, the highest temperature will be 62.6°F, while the lowest temperature will be 33.8°F.
The highest temperature will be significantly higher than the average maximum of 48.6°F in October. The lowest temperature will be relatively higher than the average low of 29.8°F.
The highest temperature will be significantly higher than the average maximum of 48.6°F in October. The lowest temperature will be relatively higher than the average low of 29.8°F.
On Sunday, in Garrison, sunrise will be at 7:53 am and sunset at 6:39 pm (MDT).
Today, the daylight will last for 10h and 46min.
