The highest day temperature in May 2023 was 66°F. The lowest night temperature was 28°F. The average values for day and night temperatures during May were 55.9°F и 37.3°F respectivly.

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

Precipitation total in May for Boulder is 2.9 in. It makes may one of the most rainy months of the year.

The average wind speed in May is 6.2 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 May is 8.0 hours.