Weather forecast for 10 daysGrantsdale, MT
Weather forecast for the weekend
Sunday Oct 18, 2026
- 64°F
- 34°F
Partly Cloudy
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 4mphE 86°
- Humidity: 66%
- UV index: 3
- Sunrise: 7:58 am MDT
- Sunset: 6:45 pm MDT
- details ▼
On Sunday, October 18, sunny moments will alternate with patchy cloud cover.
Daytime will experience a high of a breezy 64.4°F, significantly differing from the expected night low of an icy 33.8°F.
Today, the forecasted high will be higher and much closer to September's average high of 66.2°F than October's 50°F.
Sunrise will be at 7:58 am and sunset at 6:45 pm; the daylight will last for 10h and 47min.
Daytime will experience a high of a breezy 64.4°F, significantly differing from the expected night low of an icy 33.8°F.
Today, the forecasted high will be higher and much closer to September's average high of 66.2°F than October's 50°F.
Sunrise will be at 7:58 am and sunset at 6:45 pm; the daylight will last for 10h and 47min.
10-day overview
Daily temperatures
Warmest day: tomorrow 70°C.
Coldest day: Tuesday 27.10. 45°C.
Coldest day: Tuesday 27.10. 45°C.
Chance of precipitation
Highest chance: Thursday 58%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 64°F
- 34°F
Partly Cloudy
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 4mphE 86°
- Humidity: 66%
- UV index: 3
- Sunrise: 7:58 am MDT
- Sunset: 6:45 pm MDT
- details ▼
- Monday
- Oct 19, 2026
- 70°F
- 36°F
Mostly Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 6mphS 186°
- Humidity: 55%
- UV index: 3
- Sunrise: 7:59 am MDT
- Sunset: 6:43 pm MDT
- details ▼
- Tuesday
- Oct 20, 2026
- 64°F
- 37°F
Partly Cloudy
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 4mphNNW 345°
- Humidity: 60%
- UV index: 3
- Sunrise: 8:01 am MDT
- Sunset: 6:41 pm MDT
- details ▼
- Wednesday
- Oct 21, 2026
- 66°F
- 39°F
Partly Cloudy
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 4mphSSW 205°
- Humidity: 66%
- UV index: 3
- Sunrise: 8:02 am MDT
- Sunset: 6:39 pm MDT
- details ▼
- Thursday
- Oct 22, 2026
- 64°F
- 41°F
PM Showers
- Precip. probability: 58%
- Precipitation: 0.31"
- Wind: 4mphSW 218°
- Humidity: 75%
- UV index: 2
- Sunrise: 8:03 am MDT
- Sunset: 6:38 pm MDT
- details ▼
- Friday
- Oct 23, 2026
- 46°F
- 28°F
AM Showers
- Precip. probability: 43%
- Precipitation: 0.04"
- Wind: 7mphWNW 287°
- Humidity: 88%
- UV index: 2
- Sunrise: 8:05 am MDT
- Sunset: 6:36 pm MDT
- details ▼
- Saturday
- Oct 24, 2026
- 48°F
- 30°F
Partly Cloudy
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 5mphSSW 204°
- Humidity: 72%
- UV index: 3
- Sunrise: 8:06 am MDT
- Sunset: 6:34 pm MDT
- details ▼
- Sunday
- Oct 25, 2026
- 48°F
- 28°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 4mphWSW 258°
- Humidity: 81%
- UV index: 3
- Sunrise: 8:08 am MDT
- Sunset: 6:33 pm MDT
- details ▼
- Monday
- Oct 26, 2026
- 46°F
- 27°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 4mphNNW 330°
- Humidity: 83%
- UV index: 2
- Sunrise: 8:09 am MDT
- Sunset: 6:31 pm MDT
- details ▼
- Tuesday
- Oct 27, 2026
- 45°F
- 27°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 5mphWSW 237°
- Humidity: 86%
- UV index: 2
- Sunrise: 8:10 am MDT
- Sunset: 6:29 pm MDT
- details ▼
Looking ahead, conditions suggest a period of primarily overcast and occasionally rain-filled and clear weather is anticipated.
Rainfall is predicted for Thursday and Friday.
There will be a considerable variation in temperature over the next several days. The temperature is expected to swing from 44.6°F up to 69.8°F, while the variation in nighttime lows will be also notably wide, as the lowest temperatures will be recorded between 26.6°F and 41°F.
The warmest day will be Monday, with a maximum of 69.8°F; expect the coldest day on next Tuesday with a high of 44.6°F.
Rainfall is predicted for Thursday and Friday.
There will be a considerable variation in temperature over the next several days. The temperature is expected to swing from 44.6°F up to 69.8°F, while the variation in nighttime lows will be also notably wide, as the lowest temperatures will be recorded between 26.6°F and 41°F.
The warmest day will be Monday, with a maximum of 69.8°F; expect the coldest day on next Tuesday with a high of 44.6°F.
Updated: Oct 18, 2026 @ 10:49:59 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 Grantsdale, a mix of clouds and blue sky is expected.
Today, the highest temperature will be 64.4°F, while the lowest temperature will be 33.8°F.
Today, the highest temperature will be uncommonly higher than the average maximum of 50°F in October. Today, the lowest temperature will be in line with the average low temperature.
Today, the highest temperature will be uncommonly higher than the average maximum of 50°F in October. Today, the lowest temperature will be in line with the average low temperature.
On Sunday, in Grantsdale, sunrise will be at 7:58 am and sunset at 6:45 pm (MDT).
Today, the daylight will last for 10h and 47min.
