Weather in Boulder: May
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Average day temperature: | 57.1°F |
| Average night temperature: | 40.1°F | |
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Number of sunny days: | 11 days |
| Day length: | 13.9 - 14.8 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 2.4 in. | |
| more information | ||
14 days
forecast
forecast
| Boulder |
weather in
June
June
| Boulder |
Air temperature in May, °F
Show year:
2026
2025
2024
The highest day temperature during May of 2026 was 80°F. At the same time the lowest night temperature was 26°F. Daily and nightly averages during May were 64.5°F and 44.2°F.
Sunny, partly cloudy and cloudy days
Number of sunny, partly cloudy and cloudy days in May is almost equal.
Precipitation total in May, in.
Precipitation total value in Boulder in May is 2.4 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 6.9 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: 8.2.
Best time for vacation in Boulder
Boulder on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Boulder
Local time: 07:39
July 21, tuesday
0900
79°F
SW
9 mph
9 mph
1200
86°F
W
7 mph
7 mph
1500
93°F
NW
9 mph
9 mph
1800
95°F
NW
14 mph
14 mph
2100
70°F
E
7 mph
7 mph
July 22, wednesday
0000
66°F
E
4 mph
4 mph
0300
63°F
E
6 mph
6 mph
0600
61°F
E
7 mph
7 mph
