The temperatures in Boulder in May are quite cold with temperatures between 5°C and 15°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Boulder. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
You can expect a few days of snow in Boulder during May. 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 May 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
15° / 5°
Rainy Days
11
Snowy Days
3
Dry Days
17
Rainfall
160
mm
Sun Hours
10.9
Hrs
