San Bernardino, CA Weather & Climate Normals
What a normal year in San Bernardino actually looks like
On the 30-year record NOAA keeps for San Bernardino, CA, the comfort score comes out to 60/100, mild with real seasons: A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. Only 6 months a year land in the 55–75°F range this site treats as mild.
How much San Bernardino's weather actually swings
Average temperatures in San Bernardino run from 53°F in Dec up to 80°F in Aug, a 26.3°F seasonal swing, a middling gap by national standards.
San Bernardino, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 67°F | 41°F | 2.76in | 0in |
| Feb | 67°F | 42°F | 2.99in | 0in |
| Mar | 71°F | 45°F | 2.01in | 0in |
| Apr | 76°F | 48°F | 0.91in | 0in |
| May | 80°F | 52°F | 0.35in | 0in |
| Jun | 89°F | 56°F | 0.1in | 0in |
| Jul | 95°F | 63°F | 0.1in | 0in |
| Aug | 96°F | 63°F | 0.09in | 0in |
| Sep | 92°F | 60°F | 0.13in | 0in |
| Oct | 83°F | 53°F | 0.53in | 0in |
| Nov | 75°F | 45°F | 0.89in | 0in |
| Dec | 67°F | 40°F | 2.01in | 0in |
If you're timing a visit, Mar, Apr, May, Jun, Oct, and Nov are San Bernardino's mildest stretch; if you're moving there, you should plan around Aug's heat and Dec's cold instead.
How wet San Bernardino actually gets
Over a typical year, San Bernardino sees about 12.87in of precipitation a year across roughly 43 days with measurable rain or snow, with 0in of snow a year.
San Bernardino against the rest of the country
Out of 4876 cities scored here, San Bernardino comes in at 498; within CA alone it ranks 293 of 429. Population is about 224,775.
Checking the actual forecast
These figures come from Redlands, CA US, the NOAA station 9.2 miles from San Bernardino, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is