The temperatures in Longmont in May are quite cold with temperatures between 7°C and 21°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Longmont during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Please note that Longmont can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Longmont in May 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
21° / 7°
Rainy Days
7
Snowy Days
2
Dry Days
22
Rainfall
103
mm
Sun Hours
11.1
Hrs
