Weather in Boulder: May
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Average day temperature: | 55.9°F |
| Average night temperature: | 39.4°F | |
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Number of sunny days: | 10 days |
| Day length: | 13.9 - 14.8 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 2.5 in. | |
| more information | ||
14 days
forecast
forecast
| Boulder |
weather in
June
June
| Boulder |
Air temperature in May, °F
Show year:
2025
2024
2023
The highest day temperature during May of 2025 was 72°F. At the same time the lowest night temperature was 30°F. Daily and nightly averages during May were 56.5°F and 40.7°F.
Sunny, partly cloudy and cloudy days
Mostly all days in May are partly cloudy but sunny or cloudy days are also possible.
Precipitation total in May, in.
Precipitation total value in Boulder in May is 2.5 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 6.8 mph It makes May one of the least windy months of the year.
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in May is: 8.1.
Best time for vacation in Boulder
Boulder on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Boulder
Local time: 03:11
April 09, thursday
0600
41°F
E
2 mph
2 mph
0900
55°F
W
2 mph
2 mph
1200
68°F
W
4 mph
4 mph
1500
72°F
SW
8 mph
8 mph
1800
66°F
SW
6 mph
6 mph
2100
55°F
S
5 mph
5 mph
April 10, friday
0000
46°F
E
4 mph
4 mph
0300
41°F
E
4 mph
4 mph
