The highest day temperature in April 2026 was 94°F. The lowest night temperature was 49°F. The average values for day and night temperatures during April were 79.5°F и 55.2°F respectivly.

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

Precipitation total in April for San Bernardino is 0.5 in.

The average wind speed in April is 4.8 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 San Bernardino in April is 10.1 hours.