Weather forecast for 10 daysBoulder, MT

Weather forecast for the weekend

Sunday Oct 18, 2026

  • 63°F
  • 34°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 6mphSSW 194°
  • Humidity: 50%
  • UV index: 3
  • Sunrise: 7:50 am MDT
  • Sunset: 6:36 pm MDT
  • ▼
On Sunday, October 18, variable cloud cover will persist, but sunshine will break through.
Substantial temperature variations are expected, soaring to a maximum of an enjoyable 62.6°F and descending to a minimum of an icy 33.8°F.
The day's peak of 62.6°F reflects September's seasonal pattern more than October's.
Sunrise will be at 7:50 am and sunset at 6:36 pm; the daylight will last for 10h and 47min.

10-day overview

Daily temperatures

Warmest day: tomorrow 66°C.
Coldest period: Monday - Tuesday 39°C.

Chance of precipitation

Highest chance: Friday 77%.

Long-term weather forecast

  • Sunday
  • Oct 18, 2026
  • 63°F
  • 34°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 6mphSSW 194°
  • Humidity: 50%
  • UV index: 3
  • Sunrise: 7:50 am MDT
  • Sunset: 6:36 pm MDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 66°F
  • 36°F
Sunny
Sunny
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 9mphS 179°
  • Humidity: 48%
  • UV index: 3
  • Sunrise: 7:51 am MDT
  • Sunset: 6:35 pm MDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 64°F
  • 36°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 15%
  • Precipitation: 0"
  • Wind: 6mphNNE 20°
  • Humidity: 48%
  • UV index: 3
  • Sunrise: 7:52 am MDT
  • Sunset: 6:33 pm MDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 63°F
  • 39°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 8mphS 189°
  • Humidity: 61%
  • UV index: 3
  • Sunrise: 7:54 am MDT
  • Sunset: 6:31 pm MDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 63°F
  • 41°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 18%
  • Precipitation: 0"
  • Wind: 9mphSSW 193°
  • Humidity: 64%
  • UV index: 3
  • Sunrise: 7:55 am MDT
  • Sunset: 6:30 pm MDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 46°F
  • 27°F
Showers
Showers
  • Precip. probability: 77%
  • Precipitation: 0.16"
  • Wind: 10mphNW 309°
  • Humidity: 85%
  • UV index: 1
  • Sunrise: 7:57 am MDT
  • Sunset: 6:28 pm MDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 45°F
  • 27°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 7%
  • Precipitation: 0.12"
  • Wind: 7mphSW 216°
  • Humidity: 71%
  • UV index: 3
  • Sunrise: 7:58 am MDT
  • Sunset: 6:26 pm MDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 46°F
  • 27°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 18%
  • Precipitation: 0"
  • Wind: 8mphWNW 284°
  • Humidity: 75%
  • UV index: 2
  • Sunrise: 8:00 am MDT
  • Sunset: 6:25 pm MDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 39°F
  • 25°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 20%
  • Precipitation: 0"
  • Wind: 7mphNW 326°
  • Humidity: 71%
  • UV index: 2
  • Sunrise: 8:01 am MDT
  • Sunset: 6:23 pm MDT
  • ▼
  • Tuesday
  • Oct 27, 2026
  • 39°F
  • 25°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 20%
  • Precipitation: 0"
  • Wind: 7mphW 274°
  • Humidity: 80%
  • UV index: 2
  • Sunrise: 8:02 am MDT
  • Sunset: 6:21 pm MDT
  • ▼
For the next ten days, a combination of primarily cloud-filled and occasionally mostly clear and rain-soaked weather is forecasted.
With a probability of 77%, rainfall is expected only on Friday. Anticipated precipitation will be light at 0.16".
Temperature fluctuation will be noticeable across the forecast period. Maximum temperatures are forecasted between 39.2°F and 66.2°F, while the fluctuation in night temperatures will be also significant, as the minimum temperature is expected to range between 24.8°F and 41°F.
Expect the warmest day on Monday, with temperatures peaking at 66.2°F; next Monday and Tuesday, with the highest temperature of 39.2°F, will be the coldest days.
Updated: Oct 18, 2026 @ 08:35:40 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

On Sunday, in Boulder, partly cloudy skies will persist, making for a mix of sun and clouds.

Today, the maximum temperature will be 62.6°F, while the minimum temperature will be 33.8°F.
Today, the highest temperature will be notably higher than the average maximum of 50.9°F in October. The lowest temperature will be in line with the average low of 31.3°F.

On Sunday, in Boulder, sunrise will be at 7:50 am and sunset at 6:36 pm (MDT).

In Boulder, today, there will be 10h and 47min of daylight.