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Weather in Big Sky, Montana for September 2027

Your guide to Big Sky weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Big Sky during September is quite rare, with fewer than 2 snowy days on average.

    • Rain 🌧️

  • Big Sky experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 121.1 mm.

    • More

  • Is September a good time to visit Big Sky? check out the best time to travel to Big Sky page.

  • ✨ Is September a good time to visit Big Sky? – Ask the AI Weatherman

Average dry days
20
Dry days
Average rainy days
9
Rainy days
Average snowy days
1
Snow days
Average temperatures
16°/6°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
52 %
Avg humidity

Big Sky Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
19°
2
Sunny
20°
3
Sunny
19°
4
Sunny
18°
5
Partly cloudy
17°
6
Sunny
20°
7
Thundery outbreaks possible
17°
8
Partly cloudy
16°
9
Light rain
17°
10
Thundery outbreaks possible
20°
11
Overcast
16°
12
Moderate or heavy rain with thunder
16°
13
Moderate rain
14°
14
Thundery outbreaks possible
12°
15
Moderate or heavy rain with thunder
12°
16
Moderate or heavy rain with thunder
14°
17
Mist
15°
18
Light rain
17°
19
Light rain
13°
20
Patchy rain possible
15°
21
Moderate rain
16°
22
Moderate or heavy snow with thunder
12°
23
Light rain
15°
24
Sunny
20°
25
Sunny
20°
26
Partly cloudy
14°
27
Sunny
16°
28
Patchy rain possible
16°
29
Thundery outbreaks possible
16°
30
Patchy rain possible
14°

Temperatures trend during September in Big Sky

See the weather trend as well as the moving average line

September weather in Big Sky day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Partly cloudy
Partly cloudy
 19° /10° 0.5 mm 0 cm
Sept. 2 Sunny
Sunny
 20° /9° 0 mm 0 cm
Sept. 3 Sunny
Sunny
 19° /9° 0 mm 0 cm
Sept. 4 Sunny
Sunny
 18° /7° 0 mm 0 cm
Sept. 5 Partly cloudy
Partly cloudy
 17° /5° 0 mm 0 cm
Sept. 6 Sunny
Sunny
 20° /6° 0 mm 0 cm
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
 17° /7° 1.5 mm 0 cm
Sept. 8 Partly cloudy
Partly cloudy
 16° /5° 0 mm 0 cm
Sept. 9 Light rain
Light rain
 17° /8° 3.2 mm 0 cm
Sept. 10 Thundery outbreaks possible
Thundery outbreaks possible
 20° /8° 0 mm 0 cm
Sept. 11 Overcast
Overcast
 16° /8° 0.6 mm 0 cm
Sept. 12 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 16° /5° 6.7 mm 0 cm
Sept. 13 Moderate rain
Moderate rain
 14° /5° 18.1 mm 0 cm
Sept. 14 Thundery outbreaks possible
Thundery outbreaks possible
 12° /4° 3.4 mm 0.5 cm
Sept. 15 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 12° /2° 9.6 mm 0 cm
Sept. 16 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 14° /4° 11.8 mm 0 cm
Sept. 17 Mist
Mist
 15° /5° 0.6 mm 0 cm
Sept. 18 Light rain
Light rain
 17° /6° 3.2 mm 0 cm
Sept. 19 Light rain
Light rain
 13° /6° 3.7 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 15° /7° 1 mm 0 cm
Sept. 21 Moderate rain
Moderate rain
 16° /6° 23.9 mm 0 cm
Sept. 22 Moderate or heavy snow with thunder
Moderate or heavy snow with thunder
 12° /4° 25.7 mm 1.7 cm
Sept. 23 Light rain
Light rain
 15° /4° 3 mm 0 cm
Sept. 24 Sunny
Sunny
 20° /6° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 20° /8° 0 mm 0 cm
Sept. 26 Partly cloudy
Partly cloudy
 14° /5° 0 mm 0 cm
Sept. 27 Sunny
Sunny
 16° /4° 0.8 mm 0 cm
Sept. 28 Patchy rain possible
Patchy rain possible
 16° /6° 2 mm 0 cm
Sept. 29 Thundery outbreaks possible
Thundery outbreaks possible
 16° /6° 0 mm 0 cm
Sept. 30 Patchy rain possible
Patchy rain possible
 14° /6° 1.8 mm 0 cm
Next
Important Notice
Our weather forecast for Big Sky in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Big Sky forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Big Sky in September - FAQ

What are the expected maximum and minimum temperatures in Big Sky during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Big Sky during September?
Significant rainfall exceeding 121.1 mm is expected in Big Sky during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Big Sky in September 2027?
Big Sky typically sees 0.5 cm of snowfall during September.

What are the typical wind conditions in Big Sky during September?
The average wind speed in Big Sky during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

Big Sky snow forecast September 2027

Track daily snowfall levels and discover Big Sky’s snowy potential this September ❄️
On average, Big Sky sees 1 snowy days during September, with approximately 0.5 cm of total snowfall.

September rainfall patterns in Big Sky

Explore the daily rainfall trends and prepare for Big Skys September weather 💧
Typically, Big Sky has 9 rainy days in September with a total of 121.1 mm of rainfall.
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Location coordinates Where is Big Sky?

Get accurate weather forecasts for Big Sky, located at latitude 45.285 and longitude -111.368. Stay updated with localized weather information tailored for Big Sky.

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