The highest day temperature in April 2025 was 69°F. The lowest night temperature was 11°F. The average values for day and night temperatures during April were 48.9°F и 29.2°F respectivly.

Most of the days in April are sunny but you can also expect cloudy and gloomy days.

Precipitation total in April for Boulder is 1.6 in. It makes april one of the most rainy months of the year.

The average wind speed in April is 8.0 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 April is 8.0 hours.