San Bernardino, California, United States climate
Average temperatures, precipitation and all-time records for San Bernardino, California, United States, with every day graded against ~46 years of local climate history (1980–2026). Its warmest month is July, averaging a high of 89°F, and its coldest is December, with an average low of 41°F.
San Bernardino is a city in and the county seat of San Bernardino County, California, United States. Located in the Inland Empire region of Southern California, the city had a population of 222,101 in the 2020 census, making it the 18th–most populous city in California. via Wikipedia
How today compares
Latest recorded day: 2026-07-24. Each reading placed on San Bernardino, California, United States's own ±7-day seasonal distribution.
San Bernardino average temperatures by month
Typical daily high and low, and average precipitation, for each month in San Bernardino, California, United States, based on 1980–2026 records. The wettest month is January (0.10 in on an average day).
| Month | Avg high | Avg low | Avg precip |
|---|---|---|---|
| January | 61°F | 41°F | 0.10 in |
| February | 62°F | 42°F | 0.10 in |
| March | 66°F | 45°F | 0.10 in |
| April | 71°F | 48°F | 0.00 in |
| May | 75°F | 53°F | 0.00 in |
| June | 83°F | 59°F | 0.00 in |
| July | 89°F | 65°F | 0.00 in |
| August | 89°F | 66°F | 0.00 in |
| September | 85°F | 62°F | 0.00 in |
| October | 78°F | 54°F | 0.00 in |
| November | 68°F | 46°F | 0.00 in |
| December | 61°F | 41°F | 0.10 in |
Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.
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Record extremes
- Hottest day on record: 111°F on 2020-09-06
- Coldest day on record: 23°F on 1990-12-23
Percentiles compare each day to San Bernardino, California, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →