Longmont Weather in October

The climate in Longmont during October can be summarized as mild and dry.

October is in the fall / autumn in Longmont and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 19°C (66°F), whilst at night 3°C (37°F) is normal.

On average October is the 5th driest month of the year in Longmont with around 27mm 1.1 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 8.6 hours of sunshine per day.

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 Longmont in October 2025.