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Weather in Big Sky, Montana for October 2026

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

    Snow Forecast ❄️

  • The climate of Big Sky in October is quite snowy, averaging 11 snowy days.
    According to Big Sky snow forecast for October 2026, no snow is expected at the beginning of the month.

    • Temperatures

  • Expect cooler weather in first days of October 2026 in Big Sky with the forecast suggesting a temperature of 15.8 °F, lower than the historical average.

  • In general, the average temperature in Big Sky at the beginning of October is 11.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 3.3 °F by the end of October.

    • More

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

Average dry days
18
Dry days
Average rainy days
2
Rainy days
Average snowy days
11
Snow days
Average temperatures
7°/0°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
65 %
Avg humidity

Big Sky Weather October

Move between months or click on a day
September
November
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
17°
2
Sunny
18°
3
Overcast
18°
4
Heavy snow
8°
5
Moderate or heavy snow with thunder
0°
6
Mist
6°
7
Sunny
14°
8
Sunny
13°
9
Sunny
17°
10
Thundery outbreaks possible
16°
11
Thundery outbreaks possible
12°
12
Moderate or heavy snow showers
0°
13
Overcast
6°
14
Thundery outbreaks possible
8°
15
Heavy snow
4°
16
Moderate snow
1°
17
Overcast
5°
18
Overcast
4°
19
Moderate or heavy snow with thunder
4°
20
Moderate or heavy snow showers
0°
21
Cloudy
8°
22
Sunny
12°
23
Sunny
9°
24
Overcast
9°
25
Overcast
7°
26
Moderate or heavy snow showers
1°
27
Moderate or heavy snow with thunder
-2°
28
Partly cloudy
0°
29
Overcast
8°
30
Mist
4°
31
Cloudy
5°

Temperatures trend during October in Big Sky

See the weather trend as well as the moving average line

October weather in Big Sky day by day

Click on a date for more information
September November
Date Weather Temperatures Rain Snow More
Oct. 1 Sunny
Sunny
 17° /1° 0 mm 0 cm
Oct. 2 Sunny
Sunny
 18° /4° 0 mm 0 cm
Oct. 3 Overcast
Overcast
 18° /6° 0.9 mm 0 cm
Oct. 4 Heavy snow
Heavy snow
 8° /0° 68.2 mm 42 cm
Oct. 5 Moderate or heavy snow with thunder
Moderate or heavy snow with thunder
 0° /-3° 40.4 mm 25.6 cm
Oct. 6 Mist
Mist
 6° /-2° 0 mm 0 cm
Oct. 7 Sunny
Sunny
 14° /0° 0 mm 0 cm
Oct. 8 Sunny
Sunny
 13° /3° 0 mm 0 cm
Oct. 9 Sunny
Sunny
 17° /7° 0 mm 0 cm
Oct. 10 Thundery outbreaks possible
Thundery outbreaks possible
 16° /9° 0 mm 0 cm
Oct. 11 Thundery outbreaks possible
Thundery outbreaks possible
 12° /6° 9.8 mm 0 cm
Oct. 12 Moderate or heavy snow showers
Moderate or heavy snow showers
 0° /-3° 23.6 mm 17 cm
Oct. 13 Overcast
Overcast
 6° /-3° 0 mm 0 cm
Oct. 14 Thundery outbreaks possible
Thundery outbreaks possible
 8° /-2° 1.3 mm 0 cm
Oct. 15 Heavy snow
Heavy snow
 4° /0° 48.9 mm 21.8 cm
Oct. 16 Moderate snow
Moderate snow
 1° /0° 10.2 mm 7.4 cm
Oct. 17 Overcast
Overcast
 5° /-1° 0 mm 0 cm
Oct. 18 Overcast
Overcast
 4° /-3° 2.2 mm 1.6 cm
Oct. 19 Moderate or heavy snow with thunder
Moderate or heavy snow with thunder
 4° /-1° 20.3 mm 11 cm
Oct. 20 Moderate or heavy snow showers
Moderate or heavy snow showers
 0° /-3° 14.4 mm 8.2 cm
Oct. 21 Cloudy
Cloudy
 8° /-2° 0 mm 0 cm
Oct. 22 Sunny
Sunny
 12° /0° 0 mm 0 cm
Oct. 23 Sunny
Sunny
 9° /2° 0 mm 0 cm
Oct. 24 Overcast
Overcast
 9° /3° 0 mm 0 cm
Oct. 25 Overcast
Overcast
 7° /1° 1.5 mm 0.6 cm
Oct. 26 Moderate or heavy snow showers
Moderate or heavy snow showers
 1° /-1° 4.4 mm 1.9 cm
Oct. 27 Moderate or heavy snow with thunder
Moderate or heavy snow with thunder
 -2° /-8° 11.5 mm 8.3 cm
Oct. 28 Partly cloudy
Partly cloudy
 0° /-9° 0 mm 0 cm
Oct. 29 Overcast
Overcast
 8° /-5° 0 mm 0 cm
Oct. 30 Mist
Mist
 4° /-7° 0 mm 0 cm
Oct. 31 Cloudy
Cloudy
 5° /-4° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Big Sky in October 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 October - FAQ

What are the expected maximum and minimum temperatures in Big Sky during October?
Prepare for cooler days with highs just around 7° and colder nights, dipping below 0°.

How much rainfall should be expected in Big Sky during October?
Significant rainfall exceeding 256.7 mm is expected in Big Sky during October, occurring over more than 2 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Big Sky in October 2026?
Big Sky experiences an average snowfall of 145.4 cm during October, occurring over 11 days.

What are the typical wind conditions in Big Sky during October?
The average wind speed in Big Sky during October is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

Big Sky snow forecast October 2026

Track daily snowfall levels and discover Big Sky’s snowy potential this October ❄️
On average, Big Sky sees 11 snowy days during October, with approximately 145.4 cm of total snowfall.

October rainfall patterns in Big Sky

Explore the daily rainfall trends and prepare for Big Skys October weather 💧
Typically, Big Sky has 2 rainy days in October with a total of 256.7 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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