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, thin clouds will pass through at times, but overall, it will remain bright.
Temperature changes will be remarkable, ranging from a high of an enjoyable 62.6°F to a low of an icy 35.6°F.
Tomorrow, the peak temperature is predicted to be a couple of degrees higher than the usual high for October at 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.
Temperature changes will be remarkable, ranging from a high of an enjoyable 62.6°F to a low of an icy 35.6°F.
Tomorrow, the peak temperature is predicted to be a couple of degrees higher than the usual high for October at 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: 8mphW 278°
- Humidity: 53%
- 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 ▼
Models point to a combination of gloomy, sunny and rain-filled weather is anticipated.
With a probability of 56%, rainfall is expected only on Friday. Forecasted precipitation will be light at 0.28".
Expect a substantial fluctuation in daytime highs in the upcoming period. Maximum temperatures are forecasted between 48.2°F and 71.6°F, while the variation in nighttime lows will be also notably wide, as the minimum temperature is expected to range between 33.8°F and 48.2°F.
The warmest day will be Thursday, with a maximum of 71.6°F; next Sunday and Monday, with the highest temperature of 48.2°F, will be the coldest days in Roundup.
With a probability of 56%, rainfall is expected only on Friday. Forecasted precipitation will be light at 0.28".
Expect a substantial fluctuation in daytime highs in the upcoming period. Maximum temperatures are forecasted between 48.2°F and 71.6°F, while the variation in nighttime lows will be also notably wide, as the minimum temperature is expected to range between 33.8°F and 48.2°F.
The warmest day will be Thursday, with a maximum of 71.6°F; next Sunday and Monday, with the highest temperature of 48.2°F, will be the coldest days in Roundup.
Updated: Oct 18, 2026 @ 03:41:03 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 Roundup, expect partly sunny skies with periods of cloudiness.
Tomorrow, the maximum temperature will be 62.6°F, while the minimum temperature will be 35.6°F.
Tomorrow, the maximum temperature will be relatively higher than the average highest temperature in October. The lowest temperature tomorrow will be also a few degrees lower than the average low temperature.
Tomorrow, the maximum temperature will be relatively higher than the average highest temperature in October. The lowest temperature tomorrow will be also a few degrees lower than the average low temperature.
On Sunday, in Roundup, sunrise will be at 7:36 am and sunset at 6:22 pm (MDT).
In Roundup, tomorrow, there will be 10h and 46min of daylight.
