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 ▼
Tomorrow, on Sunday, blue skies and warm sunshine will define the conditions.
The highest daytime temperature will touch a breezy 60.8°F, creating a significant contrast with the anticipated nighttime low of a harsh 30.2°F.
Tomorrow, the weather pattern will resemble September more than October, with a forecast high of 60.8°F.
Sunrise will be at 7:45 am and sunset at 6:34 pm; tomorrow's daylight will last for 10h and 49min.
The highest daytime temperature will touch a breezy 60.8°F, creating a significant contrast with the anticipated nighttime low of a harsh 30.2°F.
Tomorrow, the weather pattern will resemble September more than October, with a forecast high of 60.8°F.
Sunrise will be at 7:45 am and sunset at 6:34 pm; tomorrow's daylight will last for 10h and 49min.
10-day overview
Daily temperatures
Warmest period: tomorrow - Monday 61°C.
Coldest day: Saturday 24.10. 41°C.
Coldest day: Saturday 24.10. 41°C.
Chance of precipitation
Highest chance: Friday 79%.
Long-term weather forecast
- Saturday
- Oct 17, 2026
- min.
- 30°F
Mostly Clear
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 6mphSSW 197°
- Humidity: 67%
- UV index: 0
- Sunrise: 7:44 am MDT
- Sunset: 6:36 pm MDT
- details ▼
- 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: 24%
- Precipitation: 0"
- Wind: 9mphSSW 202°
- 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: 16%
- Precipitation: 0.12"
- 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: 79%
- Precipitation: 0.59"
- Wind: 8mphWSW 253°
- Humidity: 88%
- 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"
- Wind: 7mphSW 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 ▼
Models point to a combination of primarily gloomy and occasionally sunny and rain-filled weather is predicted.
Rain is expected on Thursday and Friday.
Temperature differences will be noticeable in the upcoming days. The temperature is expected to swing from 41°F up to 60.8°F, while there will be also a marked difference in overnight low temperatures, as nighttime lows are forecast to fall between 23°F and 37.4°F.
Sunday and Monday, with the highest temperature of 60.8°F, will be the warmest days in Big Sky; expect the coldest day on next Saturday with a high of 41°F.
Rain is expected on Thursday and Friday.
Temperature differences will be noticeable in the upcoming days. The temperature is expected to swing from 41°F up to 60.8°F, while there will be also a marked difference in overnight low temperatures, as nighttime lows are forecast to fall between 23°F and 37.4°F.
Sunday and Monday, with the highest temperature of 60.8°F, will be the warmest days in Big Sky; expect the coldest day on next Saturday with a high of 41°F.
Updated: Oct 18, 2026 @ 05:24:21 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, clear skies with only minor cloud interruptions are in the outlook.
Tomorrow, the highest temperature will be 60.8°F, while the lowest temperature will be 30.2°F.
The maximum temperature will be noticeably higher than the average highest temperature of 45.5°F in October. Tomorrow, the lowest temperature will be in line with the average low temperature.
The maximum temperature will be noticeably higher than the average highest temperature of 45.5°F in October. Tomorrow, the lowest temperature 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).
Tomorrow, the daylight will last for 10h and 49min.
