Weather forecast for 10 daysBig Sky, MT
Weather forecast for the weekend
Sunday Oct 18, 2026
- 61°F
- 30°F
Mostly Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 6mphSSW 213°
- Humidity: 47%
- UV index: 3
- Sunrise: 7:45 am MDT
- Sunset: 6:34 pm MDT
- details ▼
Today, in Big Sky, a pleasant, mostly sunny outlook is in place.
Temperature readings are predicted to span from a high of a comfortable 60.8°F to a low of a subzero 30.2°F.
Today, the maximum temperature will be higher and more reflective of September's average high of 63.5°F than October's of 45.5°F.
Sunrise will be at 7:45 am and sunset at 6:34 pm; the daylight will last for 10h and 49min.
Temperature readings are predicted to span from a high of a comfortable 60.8°F to a low of a subzero 30.2°F.
Today, the maximum temperature will be higher and more reflective of September's average high of 63.5°F than October's of 45.5°F.
Sunrise will be at 7:45 am and sunset at 6:34 pm; the daylight will last for 10h and 49min.
10-day overview
Daily temperatures
Warmest period: today - tomorrow 61°C.
Minimum temperature: 41°C.
Minimum temperature: 41°C.
Chance of precipitation
Highest chance: Friday 80%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 61°F
- 30°F
Mostly Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 6mphSSW 213°
- Humidity: 47%
- UV index: 3
- Sunrise: 7:45 am MDT
- Sunset: 6:34 pm MDT
- details ▼
- Monday
- Oct 19, 2026
- 61°F
- 34°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 9mphSSW 196°
- Humidity: 46%
- UV index: 3
- Sunrise: 7:46 am MDT
- Sunset: 6:33 pm MDT
- details ▼
- Tuesday
- Oct 20, 2026
- 59°F
- 36°F
Partly Cloudy
- Precip. probability: 15%
- Precipitation: 0"
- Wind: 6mphSSW 210°
- Humidity: 52%
- UV index: 2
- Sunrise: 7:48 am MDT
- Sunset: 6:31 pm MDT
- details ▼
- Wednesday
- Oct 21, 2026
- 59°F
- 37°F
Partly Cloudy
- Precip. probability: 22%
- Precipitation: 0"
- Wind: 9mphSSW 203°
- Humidity: 65%
- UV index: 3
- Sunrise: 7:49 am MDT
- Sunset: 6:29 pm MDT
- details ▼
- Thursday
- Oct 22, 2026
- 59°F
- 37°F
Partly Cloudy
- Precip. probability: 11%
- Precipitation: 0"
- Wind: 9mphSSW 194°
- Humidity: 64%
- UV index: 3
- Sunrise: 7:51 am MDT
- Sunset: 6:28 pm MDT
- details ▼
- Friday
- Oct 23, 2026
- 45°F
- 23°F
Rain
- Precip. probability: 80%
- Precipitation: 0.12"
- Wind: 7mphWSW 257°
- Humidity: 87%
- UV index: 1
- Sunrise: 7:52 am MDT
- Sunset: 6:26 pm MDT
- details ▼
- Saturday
- Oct 24, 2026
- 41°F
- 27°F
Partly Cloudy
- Precip. probability: 17%
- Precipitation: 0.59"
- Wind: 8mphSW 224°
- Humidity: 73%
- UV index: 3
- Sunrise: 7:53 am MDT
- Sunset: 6:25 pm MDT
- details ▼
- Sunday
- Oct 25, 2026
- 46°F
- 27°F
Partly Cloudy
- Precip. probability: 23%
- Precipitation: 0"
- Wind: 9mphSSW 198°
- Humidity: 63%
- UV index: 3
- Sunrise: 7:55 am MDT
- Sunset: 6:23 pm MDT
- details ▼
- Monday
- Oct 26, 2026
- 46°F
- 27°F
Partly Cloudy
- Precip. probability: 20%
- Precipitation: 0"
- Wind: 7mphSSW 202°
- Humidity: 64%
- UV index: 3
- Sunrise: 7:56 am MDT
- Sunset: 6:21 pm MDT
- details ▼
- Tuesday
- Oct 27, 2026
- 41°F
- 23°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 9mphSSW 205°
- Humidity: 73%
- UV index: 3
- Sunrise: 7:57 am MDT
- Sunset: 6:20 pm MDT
- details ▼
Primarily cloudy and occasionally sunny and rain-filled weather is predicted.
Rainfall is anticipated on Friday and Saturday.
There will be a considerable variation in temperature over the next several days. The maximum temperature will vary between 41°F and 60.8°F, while the lowest nightly temperature differences will be also quite pronounced, as nighttime lows are forecast to fall between 23°F and 37.4°F.
With a maximum temperature of 60.8°F, Sunday and Monday will be the warmest days in Big Sky; the coldest days will be Saturday and next Tuesday, with a maximum of 41°F.
Rainfall is anticipated on Friday and Saturday.
There will be a considerable variation in temperature over the next several days. The maximum temperature will vary between 41°F and 60.8°F, while the lowest nightly temperature differences will be also quite pronounced, as nighttime lows are forecast to fall between 23°F and 37.4°F.
With a maximum temperature of 60.8°F, Sunday and Monday will be the warmest days in Big Sky; the coldest days will be Saturday and next Tuesday, with a maximum of 41°F.
Updated: Oct 18, 2026 @ 06:03:13 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, mainly sunny skies with just a few high clouds are anticipated.
Today, the maximum temperature in Big Sky, Montana, will be 60.8°F, while the minimum temperature will be 30.2°F.
The maximum temperature will be significantly higher than the average highest temperature of 45.5°F in October. The lowest temperature today will be in line with the average low temperature.
The maximum temperature will be significantly higher than the average highest temperature of 45.5°F in October. The lowest temperature today will be in line with the average low temperature.
On Sunday, in Big Sky, sunrise will be at 7:45 am and sunset at 6:34 pm (MDT).
Today, the daylight will last for 10h and 49min.
