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Weather in Big Sky, Montana for August 2026

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

    Temperatures

  • The forecast for the first days of August 2026 in Big Sky predicts a temperature of 27.4 °F, which is cooler than the historical average.

  • In general, the average temperature in Big Sky at the beginning of August is 22.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.7 °F by the end of August.

    • Rain 🌧️

  • Big Sky experiences moderate rainfall in August, with an average of 8 rainy days and a total precipitation of 133 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
23
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/11°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
49 %
Avg humidity

Big Sky Weather August

Move between months or click on a day
July
September
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
31°
2
Sunny
29°
3
Sunny
21°
4
Light rain shower
16°
5
Mist
18°
6
Partly cloudy
23°
7
Thundery outbreaks possible
20°
8
Patchy light snow with thunder
12°
9
Thundery outbreaks possible
16°
10
Partly cloudy
19°
11
Cloudy
20°
12
Partly cloudy
24°
13
Thundery outbreaks possible
23°
14
Partly cloudy
22°
15
Cloudy
22°
16
Light rain shower
23°
17
Light rain shower
21°
18
Thundery outbreaks possible
23°
19
Partly cloudy
26°
20
Overcast
25°
21
Sunny
22°
22
Sunny
20°
23
Partly cloudy
23°
24
Sunny
20°
25
Sunny
22°
26
Light rain shower
21°
27
Light rain shower
14°
28
Patchy light rain with thunder
14°
29
Partly cloudy
18°
30
Sunny
20°
31
Sunny
22°

Temperatures trend during August in Big Sky

See the weather trend as well as the moving average line

August weather in Big Sky day by day

Click on a date for more information
July September
Date Weather Temperatures Rain UV More
Aug. 1 Sunny
Sunny
 31° /16° 0 mm 8
Aug. 2 Sunny
Sunny
 29° /16° 0 mm 7
Aug. 3 Sunny
Sunny
 21° /9° 0 mm 12
Aug. 4 Light rain shower
Light rain shower
 16° /9° 24.8 mm 7
Aug. 5 Mist
Mist
 18° /8° 0 mm 12
Aug. 6 Partly cloudy
Partly cloudy
 23° /13° 0 mm 12
Aug. 7 Thundery outbreaks possible
Thundery outbreaks possible
 20° /13° 0 mm 11
Aug. 8 Patchy light snow with thunder
Patchy light snow with thunder
 12° /3° 14.8 mm 7
Aug. 9 Thundery outbreaks possible
Thundery outbreaks possible
 16° /7° 0 mm 12
Aug. 10 Partly cloudy
Partly cloudy
 19° /10° 0 mm 11
Aug. 11 Cloudy
Cloudy
 20° /11° 0 mm 11
Aug. 12 Partly cloudy
Partly cloudy
 24° /13° 0 mm 11
Aug. 13 Thundery outbreaks possible
Thundery outbreaks possible
 23° /15° 0 mm 11
Aug. 14 Partly cloudy
Partly cloudy
 22° /14° 0 mm 11
Aug. 15 Cloudy
Cloudy
 22° /13° 0 mm 11
Aug. 16 Light rain shower
Light rain shower
 23° /14° 4.8 mm 11
Aug. 17 Light rain shower
Light rain shower
 21° /12° 1.9 mm 11
Aug. 18 Thundery outbreaks possible
Thundery outbreaks possible
 23° /12° 0 mm 11
Aug. 19 Partly cloudy
Partly cloudy
 26° /17° 0 mm 10
Aug. 20 Overcast
Overcast
 25° /17° 0 mm 11
Aug. 21 Sunny
Sunny
 22° /12° 0 mm 10
Aug. 22 Sunny
Sunny
 20° /12° 0 mm 10
Aug. 23 Partly cloudy
Partly cloudy
 23° /10° 0 mm 10
Aug. 24 Sunny
Sunny
 20° /10° 0 mm 10
Aug. 25 Sunny
Sunny
 22° /10° 0 mm 10
Aug. 26 Light rain shower
Light rain shower
 21° /13° 2.5 mm 5
Aug. 27 Light rain shower
Light rain shower
 14° /10° 8.5 mm 2
Aug. 28 Patchy light rain with thunder
Patchy light rain with thunder
 14° /10° 44.5 mm 3
Aug. 29 Partly cloudy
Partly cloudy
 18° /9° 0 mm 9
Aug. 30 Sunny
Sunny
 20° /10° 0 mm 9
Aug. 31 Sunny
Sunny
 22° /11° 0 mm 9
Next
Important Notice
Our weather forecast for Big Sky in August 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.
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Big Sky in August - FAQ

What are the expected maximum and minimum temperatures in Big Sky during August?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Big Sky during August?
Significant rainfall exceeding 133 mm is expected in Big Sky during August, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Big Sky during August?
The average wind speed in Big Sky during August is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

August rainfall patterns in Big Sky

Explore the daily rainfall trends and prepare for Big Skys August weather 💧
Typically, Big Sky has 8 rainy days in August with a total of 133 mm of rainfall.

UV exposure in Big Sky during August

Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️

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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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