The temperatures in Longmont in October are quite cold with temperatures between 5°C and 18°C, warm clothes are a must.
The wather in Longmont in October can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
You can expect a few days of snow in Longmont during October. It’s important to get out your snow boots and warm mittens to stay warm while you explore Longmont.
Our weather forecast can give you a great sense of what weather to expect in Longmont in October 2025.
If you’re planning to visit Longmont in the near future, we highly recommend that you review the 14 day weather forecast for Longmont before you arrive.
Temperatures
18° / 5°
Rainy Days
2
Snowy Days
3
Dry Days
26
Rainfall
33
mm
Sun Hours
11.5
Hrs
