Great Falls Weather in October
What's the weather like in Great Falls (Montana) in October 2025?
The climate in Great Falls during October can be summarized as cool and dry.
October is in the fall / autumn in Great Falls and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (60°F), whilst at night 2°C (36°F) is normal.
| Daytime temperature | 15.4°C 59.6°F |
|---|---|
| Nightly temperature | 2.1°C 35.7°F |
| Average temperature | 8.7°C 47.7°F |
| Daily sunshine | 7.1 hrs |
| Avg rainfall | 19 mm 0.7 ins |
| Rainy days | 5 days |
| Sea temperature | 11.2°C 52.1°F |
| Humidity | 54% |
| Windspeed | 19.1kph 12 mph |
On average October is the 4th driest month of the year in Great Falls with around 19mm 0.7 inches of rain making it a dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.1 hours of sunshine per day.
October temperatures in Great Falls
October rainfall
October hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Great Falls in October 2025.
Other monthly averages
Best places to visit in October
Great Falls weather stats
| Hottest month: | July | 27.8°C 82°F |
|---|---|---|
| Driest month: | February | 14mm 0.6ins |
| Sunniest month: | July | 13.1hrs |
| Coldest month: | January | -1.7°C 28.9°F |
| Wettest month: | June | 71mm 2.8ins |
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