San Bernardino, California, United States climate

Average temperatures, precipitation and all-time records for San Bernardino, California, United States, with every day graded against ~45 years of local climate history (1981–2026). Its warmest month is August, averaging a high of 94°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: 2026-07-21. Each reading placed on San Bernardino, California, United States's own ±7-day seasonal distribution.

High 94°F Normal · 56th pct

Low 72°F Very High · 92nd pct

Feels-like 96°F Normal · 51st pct

Humidity 10.0 g/m³ Normal · 54th pct

Wind 11 mph Low · 17th pct

Precip 0.00 in Dry

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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 1981–2026 records. The wettest month is January (0.10 in on an average day).

Month	Avg high	Avg low	Avg precip
January	64°F	41°F	0.10 in
February	65°F	42°F	0.10 in
March	70°F	44°F	0.10 in
April	74°F	47°F	0.00 in
May	80°F	51°F	0.00 in
June	87°F	57°F	0.00 in
July	93°F	64°F	0.00 in
August	94°F	65°F	0.00 in
September	90°F	62°F	0.00 in
October	83°F	56°F	0.00 in
November	71°F	47°F	0.00 in
December	63°F	41°F	0.10 in

Jan 34°–75°

Feb 35°–77°

Mar 37°–82°

Apr 40°–86°

May 45°–91°

Jun 50°–96°

Jul 56°–100°

Aug 57°–102°

Sep 54°–99°

Oct 48°–93°

Nov 39°–83°

Dec 33°–75°

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: 114°F on 2020-09-06
Coldest day on record: 21°F on 1990-12-23

All San Bernardino weather records →

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 →