The weather in Longmont in August is hot. The average temperatures are between 16°C and 32°C. Usually the days in August are hot while the nights are a bit cooler.
You can expect a few rainy days in Longmont during August, but usually the weather is comfortable in August.
Our weather forecast can give you a great sense of what weather to expect in Longmont in August 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
32° / 16°
Rainy Days
1
Snowy Days
0
Dry Days
30
Rainfall
35
mm
Sun Hours
11.9
Hrs
