Climate
San Bernardino weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: April, May, October, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 67°F | 41°F | 2.8 in | 7 |
| February | 67°F | 42°F | 3.0 in | 8 |
| March | 71°F | 45°F | 2.0 in | 6 |
| April | 76°F | 48°F | 0.90 in | 4 |
| May | 80°F | 52°F | 0.30 in | 3 |
| June | 89°F | 56°F | 0.10 in | 1 |
| July | 95°F | 63°F | 0.10 in | 1 |
| August | 96°F | 63°F | 0.10 in | 1 |
| September | 92°F | 60°F | 0.10 in | 1 |
| October | 83°F | 53°F | 0.50 in | 3 |
| November | 75°F | 45°F | 0.90 in | 4 |
| December | 67°F | 40°F | 2.0 in | 6 |
NOAA U.S. Climate Normals 1991–2020, Redlands, Ca Us (7.3 mi away, 1,410 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in San Bernardino?
August, with an average high of 96°F and low of 63°F.
What is the coldest month in San Bernardino?
December, with an average low of 40°F and high of 67°F.
When does it rain most in San Bernardino?
February is the wettest month, averaging 3.0 in of precipitation; the year totals about 12.8 inches.
What is the best time to visit San Bernardino?
For mild weather (highs between 65°F and 85°F) with the least rain, April, May, October.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the Redlands weather station, 7.3 miles from downtown: 30-year averages, not a forecast.