Roundup Weather in October

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

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

October is in the fall / autumn in Roundup and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 16°C (61°F), whilst at night 1°C (34°F) is normal.

Roundup weather averages (imperial / metric)
Daytime temperature 16.3°C 61.3°F
Nightly temperature 1.3°C 34.3°F
Average temperature 8.8°C 47.8°F
Daily sunshine 7.2 hrs
Avg rainfall 26 mm 1 ins
Rainy days 6 days
Sea temperature 11.7°C 53.1°F
Humidity 54%
Windspeed 18kph 11 mph

On average October is the 6th driest month of the year in Roundup with around 26mm 1 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 7.2 hours of sunshine per day.

October temperatures in Roundup

Roundup average temperature in October

October rainfall

Roundup average rain in October

October hourly sunshine

Roundup 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 Roundup 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

Roundup weather stats

Roundup weather statistics
Hottest month: July 29.5°C 85.1°F
Driest month: February 13mm 0.5ins
Sunniest month: July 12.7hrs
Coldest month: January -0.3°C 31.5°F
Wettest month: May 73mm 2.9ins
Map showing location of Roundup (46.44524, -108.5418) Roundup map pin © Google

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