The weather in Boulder in October is very cold with temperatures between 2°C and 13°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Boulder during the month of October. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
You can expect a few days of snow in Boulder during October. It’s important to get out your snow boots and warm mittens to stay warm while you explore Boulder.
Our weather forecast can give you a great sense of what weather to expect in Boulder in October 2025.
If you’re planning to visit Boulder in the near future, we highly recommend that you review the 14 day weather forecast for Boulder before you arrive.
Temperatures
13° / 2°
Rainy Days
3
Snowy Days
4
Dry Days
24
Rainfall
47
mm
Sun Hours
11.4
Hrs
