Weather forecast for 10 daysSimpson, MT
Weather forecast for the weekend
Sunday Oct 18, 2026
- 59°F
- 34°F
Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 9mphE 93°
- Humidity: 44%
- UV index: 2
- Sunrise: 7:46 am MDT
- Sunset: 6:25 pm MDT
- details ▼
Tomorrow, on Sunday, the weather remains calm, bright, and sunny.
Temperature is expected to swing from a high of a refreshing 59°F to a low of an icy 33.8°F.
The highest temperature for tomorrow is predicted to be relatively higher than the average October temperature of 54.3°F.
Sunrise will be at 7:46 am and sunset at 6:25 pm; tomorrow's daylight will last for 10h and 39min.
Temperature is expected to swing from a high of a refreshing 59°F to a low of an icy 33.8°F.
The highest temperature for tomorrow is predicted to be relatively higher than the average October temperature of 54.3°F.
Sunrise will be at 7:46 am and sunset at 6:25 pm; tomorrow's daylight will last for 10h and 39min.
10-day overview
Daily temperatures
Warmest day: Thursday 66°C.
Coldest day: Sunday 25.10. 41°C.
Coldest day: Sunday 25.10. 41°C.
Chance of precipitation
Highest chance: Friday 34%.
Long-term weather forecast
- Saturday
- Oct 17, 2026
- min.
- 36°F
Mostly Clear
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 19mphNW 310°
- Humidity: 51%
- UV index: 0
- Sunrise: 7:44 am MDT
- Sunset: 6:27 pm MDT
- details ▼
- Sunday
- Oct 18, 2026
- 59°F
- 34°F
Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 9mphE 93°
- Humidity: 44%
- UV index: 2
- Sunrise: 7:46 am MDT
- Sunset: 6:25 pm MDT
- details ▼
- Monday
- Oct 19, 2026
- 61°F
- 36°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 7mphESE 121°
- Humidity: 56%
- UV index: 2
- Sunrise: 7:47 am MDT
- Sunset: 6:23 pm MDT
- details ▼
- Tuesday
- Oct 20, 2026
- 59°F
- 30°F
AM Clouds / PM Sun
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 10mphNW 319°
- Humidity: 55%
- UV index: 2
- Sunrise: 7:49 am MDT
- Sunset: 6:21 pm MDT
- details ▼
- Wednesday
- Oct 21, 2026
- 63°F
- 37°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 10mphSE 141°
- Humidity: 62%
- UV index: 2
- Sunrise: 7:51 am MDT
- Sunset: 6:19 pm MDT
- details ▼
- Thursday
- Oct 22, 2026
- 66°F
- 43°F
Partly Cloudy
- Precip. probability: 6%
- Precipitation: 0.04"
- Wind: 9mphS 173°
- Humidity: 60%
- UV index: 2
- Sunrise: 7:52 am MDT
- Sunset: 6:17 pm MDT
- details ▼
- Friday
- Oct 23, 2026
- 50°F
- 32°F
Few Showers
- Precip. probability: 34%
- Precipitation: 0.12"
- Wind: 17mphNW 313°
- Humidity: 75%
- UV index: 2
- Sunrise: 7:54 am MDT
- Sunset: 6:15 pm MDT
- details ▼
- Saturday
- Oct 24, 2026
- 45°F
- 27°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 14mphWNW 298°
- Humidity: 64%
- UV index: 2
- Sunrise: 7:55 am MDT
- Sunset: 6:14 pm MDT
- details ▼
- Sunday
- Oct 25, 2026
- 41°F
- 28°F
AM Snow Showers
- Precip. probability: 33%
- Precipitation: 0.08"
- Wind: 11mphNE 34°
- Humidity: 73%
- UV index: 2
- Sunrise: 7:57 am MDT
- Sunset: 6:12 pm MDT
- details ▼
- Monday
- Oct 26, 2026
- 43°F
- 27°F
Sunny
- Precip. probability: 13%
- Precipitation: 0"
- Wind: 10mphESE 121°
- Humidity: 69%
- UV index: 2
- Sunrise: 7:58 am MDT
- Sunset: 6:10 pm MDT
- details ▼
And a mix of overcast, sun-filled, rain-filled and snow-covered weather is anticipated.
With a probability of 34%, rainfall is anticipated only on Friday. Expected precipitation will be minimal at 0.12".
With a probability of 33%, 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 days. Maximum temperatures are forecasted between 41°F and 66.2°F, while the lowest nightly temperature differences will be also quite pronounced, as the overnight lows will vary from 26.6°F to 42.8°F.
With the highest temperature of 66.2°F, Thursday will be the warmest day; the lowest daytime temperature of the period will be reached on next Sunday, peaking at 41°F.
With a probability of 34%, rainfall is anticipated only on Friday. Expected precipitation will be minimal at 0.12".
With a probability of 33%, 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 days. Maximum temperatures are forecasted between 41°F and 66.2°F, while the lowest nightly temperature differences will be also quite pronounced, as the overnight lows will vary from 26.6°F to 42.8°F.
With the highest temperature of 66.2°F, Thursday will be the warmest day; the lowest daytime temperature of the period will be reached on next Sunday, peaking at 41°F.
Updated: Oct 18, 2026 @ 02:19:31 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
Tomorrow, skies are expected to be clear and full of sunshine.
Tomorrow, the maximum temperature will be 59°F, while the minimum temperature will be 33.8°F.
The highest temperature tomorrow will be moderately higher than the average maximum temperature in October. The lowest temperature will be also slightly cooler than the average low of 38.8°F.
The highest temperature tomorrow will be moderately higher than the average maximum temperature in October. The lowest temperature will be also slightly cooler than the average low of 38.8°F.
On Sunday, in Simpson, sunrise will be at 7:46 am and sunset at 6:25 pm (MDT).
In Simpson, Montana, tomorrow, there will be 10h and 39min of daylight.
