Weather in Boulder: September
Average day temperature: | 66.7°F | |
Average night temperature: | 48.1°F | |
Number of sunny days: | 21 days | |
Day length: | 11.8 - 13.1 hours | |
Number of rainy days: | 1 day | |
Precipitation totals: | 0.9 in. | |
more information |
14 days
forecast
forecast
Boulder |
weather in
October
October
Boulder |
Air temperature in September, °F
Show year:
2023
2022
2021
The highest day temperature during September of 2023 was 76°F. At the same time the lowest night temperature was 39°F. Day and night temperature averages during September were 66.0°F and 50.4°F.
Sunny, partly cloudy and cloudy days
Mostly all days in September are sunny but cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in Boulder in September is 0.9 in. Other months of the year show relatively similar values.
Wind speed in September, mph
The average wind speed value in September is 6.5 mph
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 September is: 9.4.
Best time for vacation in Boulder
Boulder on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Boulder
Local time: 20:06
May 18, saturday
2100
55°F
E
6 mph
6 mph
May 19, sunday
0000
55°F
E
7 mph
7 mph
0300
54°F
E
6 mph
6 mph
0600
54°F
E
8 mph
8 mph
0900
66°F
NE
2 mph
2 mph
1200
70°F
E
14 mph
14 mph
1500
72°F
E
14 mph
14 mph
1800
68°F
NE
12 mph
12 mph