Weather forecast for 10 daysRoundup, MT
Weather forecast for the weekend
Sunday Oct 18, 2026
- 63°F
- 36°F
Partly Cloudy
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 11mphE 80°
- Humidity: 47%
- UV index: 3
- Sunrise: 7:36 am MDT
- Sunset: 6:22 pm MDT
- details ▼
Tomorrow, on Sunday, October 18, a mix of clouds and blue sky is expected.
Day and night temperatures will contrast sharply, ranging from a peak of a breezy 62.6°F to a low of a wintry 35.6°F.
The highest temperature for tomorrow is anticipated to be slightly warmer than the average October temperature of 56.3°F.
Sunrise will be at 7:36 am and sunset at 6:22 pm; tomorrow's daylight will last for 10h and 46min.
Day and night temperatures will contrast sharply, ranging from a peak of a breezy 62.6°F to a low of a wintry 35.6°F.
The highest temperature for tomorrow is anticipated to be slightly warmer than the average October temperature of 56.3°F.
Sunrise will be at 7:36 am and sunset at 6:22 pm; tomorrow's daylight will last for 10h and 46min.
10-day overview
Daily temperatures
Warmest day: Thursday 72°C.
Coldest period: Sunday - Monday 48°C.
Coldest period: Sunday - Monday 48°C.
Chance of precipitation
Highest chance: Friday 56%.
Long-term weather forecast
- Saturday
- Oct 17, 2026
- min.
- 39°F
Mostly Clear
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 7mphWNW 282°
- Humidity: 54%
- UV index: 0
- Sunrise: 7:34 am MDT
- Sunset: 6:24 pm MDT
- details ▼
- Sunday
- Oct 18, 2026
- 63°F
- 36°F
Partly Cloudy
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 11mphE 80°
- Humidity: 47%
- UV index: 3
- Sunrise: 7:36 am MDT
- Sunset: 6:22 pm MDT
- details ▼
- Monday
- Oct 19, 2026
- 68°F
- 41°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 12mphSSW 213°
- Humidity: 52%
- UV index: 3
- Sunrise: 7:37 am MDT
- Sunset: 6:20 pm MDT
- details ▼
- Tuesday
- Oct 20, 2026
- 68°F
- 37°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 11mphNNW 337°
- Humidity: 51%
- UV index: 3
- Sunrise: 7:38 am MDT
- Sunset: 6:18 pm MDT
- details ▼
- Wednesday
- Oct 21, 2026
- 66°F
- 43°F
Sunny
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 9mphSSW 204°
- Humidity: 59%
- UV index: 3
- Sunrise: 7:40 am MDT
- Sunset: 6:17 pm MDT
- details ▼
- Thursday
- Oct 22, 2026
- 72°F
- 48°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 12mphSW 223°
- Humidity: 54%
- UV index: 3
- Sunrise: 7:41 am MDT
- Sunset: 6:15 pm MDT
- details ▼
- Friday
- Oct 23, 2026
- 61°F
- 37°F
Showers
- Precip. probability: 56%
- Precipitation: 0.28"
- Wind: 13mphWNW 298°
- Humidity: 68%
- UV index: 2
- Sunrise: 7:43 am MDT
- Sunset: 6:13 pm MDT
- details ▼
- Saturday
- Oct 24, 2026
- 50°F
- 34°F
Mostly Sunny
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 10mphWNW 295°
- Humidity: 59%
- UV index: 3
- Sunrise: 7:44 am MDT
- Sunset: 6:12 pm MDT
- details ▼
- Sunday
- Oct 25, 2026
- 48°F
- 34°F
Partly Cloudy
- Precip. probability: 13%
- Precipitation: 0"
- Wind: 11mphN 10°
- Humidity: 69%
- UV index: 2
- Sunrise: 7:46 am MDT
- Sunset: 6:10 pm MDT
- details ▼
- Monday
- Oct 26, 2026
- 48°F
- 34°F
Partly Cloudy
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 11mphNW 309°
- Humidity: 64%
- UV index: 2
- Sunrise: 7:47 am MDT
- Sunset: 6:08 pm MDT
- details ▼
For the next ten days, a combination of overcast, bright and damp weather is predicted.
With a 56% probability, rainfall is forecasted only for Friday. The precipitation will be light at 0.28".
There will be a considerable variation in temperature in the upcoming days. The temperature is expected to swing from 48.2°F up to 71.6°F, while the lowest nightly temperature differences will be also quite pronounced, as temperatures overnight will fluctuate from 33.8°F up to 48.2°F.
The warmest day will be Thursday, with a maximum of 71.6°F; with a maximum temperature of 48.2°F, next Sunday and Monday will be the coldest days.
With a 56% probability, rainfall is forecasted only for Friday. The precipitation will be light at 0.28".
There will be a considerable variation in temperature in the upcoming days. The temperature is expected to swing from 48.2°F up to 71.6°F, while the lowest nightly temperature differences will be also quite pronounced, as temperatures overnight will fluctuate from 33.8°F up to 48.2°F.
The warmest day will be Thursday, with a maximum of 71.6°F; with a maximum temperature of 48.2°F, next Sunday and Monday will be the coldest days.
Updated: Oct 18, 2026 @ 04:42:23 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, a partly cloudy outlook will keep the sky interesting throughout the day.
Tomorrow, the highest temperature in Roundup will be 62.6°F, while the lowest temperature will be 35.6°F.
The maximum temperature tomorrow will be a few degrees higher than the average highest temperature in October. The lowest temperature will be also a couple of degrees lower than the average low of 39.7°F.
The maximum temperature tomorrow will be a few degrees higher than the average highest temperature in October. The lowest temperature will be also a couple of degrees lower than the average low of 39.7°F.
On Sunday, in Roundup, sunrise will be at 7:36 am and sunset at 6:22 pm (MDT).
In Roundup, the length of the day tomorrow will be 10h and 46min.
