Boulder Weather in October

What's the weather like in Boulder (Montana) in October 2025?

The climate in Boulder during October can be summarized as cool and dry.

October is in the fall / autumn in Boulder and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 14°C (56°F), whilst at night -2°C (29°F) is normal.

Boulder weather averages (imperial / metric)
Daytime temperature 13.5°C 56.3°F
Nightly temperature -1.7°C 28.9°F
Average temperature 5.9°C 42.6°F
Daily sunshine 7.3 hrs
Avg rainfall 22 mm 0.9 ins
Rainy days 6 days
Sea temperature 11.7°C 53°F
Humidity 58%
Windspeed 14kph 9 mph

On average October is the 5th driest month of the year in Boulder with around 22mm 0.9 inches of rain making it a dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.3 hours of sunshine per day.

October temperatures in Boulder

Boulder average temperature in October

October rainfall

Boulder average rain in October

October hourly sunshine

Boulder average rain in October

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 Boulder in October 2025.

Other monthly averages

Best places to visit in October

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Boulder weather stats

Boulder weather statistics
Hottest month: July 26.8°C 80.2°F
Driest month: February 14mm 0.6ins
Sunniest month: July 12.7hrs
Coldest month: January -1.6°C 29.1°F
Wettest month: June 60mm 2.4ins
Map showing location of Boulder (46.23659, -112.12083) Boulder map pin © Google

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