San Bernardino (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit San Bernardino.
Climate overview of San Bernardino
San Bernardino, California, United States of America, sees big temperature differences between seasons, with August peaking at 35°C (95°F) and December dropping to 19°C (66°F).
The city has a relatively dry climate, receiving around 276 mm (11 in) of rainfall per year. It does experience a distinct dry season from March to November, with very hot summers and pleasant winters. December is the wettest month and June the driest. Sunshine peaks in July, when the city sees around 12.3 hours of sunshine per day.
San Bernardino Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Bernardino - and find the best time to visit.
Monthly Temperature in San Bernardino
Visitors to San Bernardino can expect significant temperature changes throughout the year. On average, daytime temperatures range from a very hot 35°C (95°F) in August to a pleasant 19°C (66°F) in December.
Nighttime temperatures range from 18°C (64°F) in August to 6°C (43°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in San Bernardino
San Bernardino's climate is marked by below-average rainfall, accumulating 276 mm (11 in) of precipitation yearly. The seasons in San Bernardino bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 86 mm (3.4 in) of precipitation. This rainfall is distributed across 7 rainy days.
In contrast, the driest month, June, experiences much less rainfall, totaling 0.2 mm (0.01 in) over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our San Bernardino Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in San Bernardino
In San Bernardino, summer days are longer and more sunny, with daily sunshine hours peaking at 12.3 hours in July. As the darker season arrives, the brightness of the sun becomes less. January sees a soft sun for only 6.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit San Bernardino
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, February, March, April, May, October and November
- Warmest weather: July, August and September
- Most sunshine: July and August
- Fewer rainy days: May, June, July, August and September
- Seasonal pattern: A distinct dry season from March to November, with very hot summers and pleasant winters
Frequently asked questions about the climate in San Bernardino
What is the best time to visit San Bernardino?
January, February, March, April, May, October and November typically offer the most optimal weather in San Bernardino. In contrast, July, August and September tend to have less optimal conditions. San Bernardino has a distinct dry season from March to November, with very hot summers and pleasant winters.
What temperatures can I expect in San Bernardino?
Daytime highs range from 19°C (66°F) in December to 35°C (95°F) in August. Nighttime lows range from 6°C (43°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does San Bernardino get?
Annual rainfall is around 276 mm (11 in). December is the wettest month with 86 mm (3.4 in), while June is the driest with 0.2 mm (0.01 in).
How sunny is San Bernardino?
San Bernardino receives around 3,279 hours of sunshine per year. July is the sunniest month with 369 hours, while January is the cloudiest with just 198 hours. Overall, San Bernardino enjoys abundant sunshine.
San Bernardino 3-Day Forecast
San Bernardino (CA) 3-Day Forecast
San Bernardino on the map
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