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 August, 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: 2026-09-06. Each reading placed on San Bernardino, California, United States's own ±7-day seasonal distribution.

High 85°F Below Normal · 32nd pct

Low 74°F Very High · 96th pct

Feels-like 90°F Normal · 44th pct

Humidity 10.1 g/m³ Below Normal · 37th pct

Wind 8 mph Above Normal · 71st pct

Gust 10 mph Near Record · 0th pct

Precip 0.04 in Heavy · 81st pct

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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 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

Jan 34°–72°

Feb 35°–74°

Mar 38°–77°

Apr 41°–82°

May 47°–87°

Jun 53°–92°

Jul 60°–95°

Aug 60°–96°

Sep 55°–94°

Oct 48°–88°

Nov 39°–78°

Dec 34°–71°

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

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 →