The highest day temperature in August 2026 was 102°F. The lowest night temperature was 46°F. The average values for day and night temperatures during August were 89.3°F и 62.5°F respectivly.

Most of the days in August are cloudy but you can also expect sunny or gloomy days.

Precipitation total in August for Boulder is 1.4 in.

The average wind speed in August is 6.5 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Boulder in August is 9.1 hours.