Butte (MT)
September
Weather in Butte, Montana for September 2026
Your guide to Butte weather in September - trends and predictions
In general, the average temperature in Butte at the beginning of September is 24.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 22.1 °F by the end of September.
With an average of 4 rainy days, Butte experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
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26
Dry days
4
Rainy days
0
Snow days
22°/8°
Temperatures
15 km/h
Avg max wind
48 %
Avg humidity
Butte Weather September
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Temperatures trend during September in Butte
See the weather trend as well as the moving average line
September weather in Butte day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 27° /13° | 0 mm | 8 | |
| Sept. 2 | Sunny | 28° /13° | 0 mm | 8 | |
| Sept. 3 | Sunny | 27° /13° | 0 mm | 8 | |
| Sept. 4 | Sunny | 21° /10° | 0 mm | 8 | |
| Sept. 5 | Sunny | 19° /5° | 0 mm | 7 | |
| Sept. 6 | Sunny | 23° /6° | 0 mm | 7 | |
| Sept. 7 |  Overcast | 24° /11° | 0 mm | 6 | |
| Sept. 8 | Sunny | 23° /7° | 0 mm | 7 | |
| Sept. 9 |  Thundery outbreaks possible | 22° /11° | 0 mm | 3 | |
| Sept. 10 | Thundery outbreaks possible | 24° /9° | 0 mm | 7 | |
| Sept. 11 | Thundery outbreaks possible | 22° /8° | 0 mm | 7 | |
| Sept. 12 | Thundery outbreaks possible | 17° /7° | 0 mm | 5 | |
| Sept. 13 | Thundery outbreaks possible | 17° /6° | 0 mm | 5 | |
| Sept. 14 | Thundery outbreaks possible | 21° /8° | 0 mm | 6 | |
| Sept. 15 |  Moderate or heavy rain with thunder | 11° /7° | 21.6 mm | 2 | |
| Sept. 16 | Overcast | 16° /7° | 0 mm | 4 | |
| Sept. 17 |  Partly cloudy | 20° /7° | 0 mm | 6 | |
| Sept. 18 | Sunny | 23° /7° | 0 mm | 6 | |
| Sept. 19 | Overcast | 22° /9° | 0 mm | 4 | |
| Sept. 20 | Sunny | 24° /10° | 0 mm | 5 | |
| Sept. 21 | Overcast | 21° /8° | 45.3 mm | 5 | |
| Sept. 22 |  Cloudy | 15° /5° | 4.2 mm | 5 | |
| Sept. 23 | Sunny | 23° /4° | 0 mm | 5 | |
| Sept. 24 | Sunny | 24° /7° | 0 mm | 5 | |
| Sept. 25 | Sunny | 25° /9° | 0 mm | 5 | |
| Sept. 26 | Cloudy | 18° /8° | 0 mm | 5 | |
| Sept. 27 | Sunny | 22° /3° | 0 mm | 4 | |
| Sept. 28 | Partly cloudy | 24° /8° | 0 mm | 4 | |
| Sept. 29 | Moderate or heavy rain with thunder | 23° /9° | 21.5 mm | 4 | |
| Sept. 30 | Thundery outbreaks possible | 19° /8° | 0 mm | 3 | |
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Important Notice
Our weather forecast for Butte 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 Butte forecast closer to your planned date for the most up-to-date weather information.
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Butte in September - FAQ
What are the expected maximum and minimum temperatures in Butte during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Butte during September?
Moderate rainfall is anticipated in Butte during September, with a total of 92.6 mm spread over approximately 4 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Butte during September?
The average wind speed in Butte during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Butte
Explore the daily rainfall trends and prepare for Buttes September weather 💧
Typically, Butte has 4 rainy days in September with a total of 92.6 mm of rainfall.
UV exposure in Butte during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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