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Climate in San Bernardino (California)


Average weather, temperature, rainfall, sunshine hours

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San Bernardino, where it's located


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Climate chart - San Bernardino
The climate of San Bernardino is subtropical, with mild, relatively rainy winters and very hot, sunny summers.
Precipitation is quite scarce, although there can be periods of bad weather in winter.
The sun shines very often.
The city is located in California, 90 km (55 mi) east of Los Angeles, at an altitude of 300 meters (1,000 feet). Just to the north, we find the San Bernardino Mountains, where the San Bernardino National Forest is located, while to the south-west we find the Santa Ana Mountains, which isolate the area from the ocean, making it hotter in summer.
In winter, however, sometimes at night it can be cold, and the temperature usually reaches -1/-3 °C (27/30 °F) on colder nights.
Due to its location in an area surrounded by mountains, the city is also subject to air stagnation and therefore pollution.
In summer, the days are often scorching, although the highest temperatures are recorded when the Santa Ana wind blows from the desert.
On the hottest days of the year, the temperature usually reaches 42/43 °C (108/109 °F). In July 2018, it reached 48 °C (118.5 °F).

San Bernardino

Best Time


To visit San Bernardino, you can choose the periods from mid-March to mid-April and from mid-October to mid-November. In winter, the weather is often mild and sunny, but sometimes it can be cold at night, and it can also rain.

San Bernardino - Climate data


In San Bernardino, the average temperature of the coldest month (December) is of 12,5 °C, that of the warmest month (August) is of 27,5 °C. Here are the average temperatures.
San Bernardino - Average temperatures (2009-2020)
Temperatures (°C)
MonthMinMaxMean
January5,919,912,9
February720,413,7
March8,72215,4
April10,825,518,2
May13,427,620,5
June15,93223,9
July18,835,126,9
August18,836,127,5
September17,434,425,9
October13,329,121,2
November8,723,916,3
December61912,5
Year12,127,119,55

Precipitation amounts to 405 millimeters per year: it is therefore quite scarce. It ranges from 0 millimeters in the driest months (June, July) to 105 millimeters in the wettest one (February). Here is the average precipitation.
San Bernardino - Average precipitation
MonthRain (mm)Days
January806
February1057
March657
April253
May52
June01
July01
August51
September51
October202
November353
December605
Year40538

San Bernardino - Weather by month

Based on the period 2009-2020
(January - February - March - April - May - June - July - August - September - October - November - December)


January is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of 12,9 °C, with a minimum of 5,9 °C and a maximum of 19,9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27 °C.
Rain iconPrecipitation amounts to 80 mm, distributed over 6 days.
The day lasts on average 10 hours and 10 minutes.
The average humidity is 45%.
The average wind speed is of 4,9 kph.


February is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of 13,7 °C, with a minimum of 7 °C and a maximum of 20,4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 1,5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27,5 °C.
Rain iconPrecipitation amounts to 105 mm, distributed over 7 days.
The day lasts on average 11 hours and 0 minutes.
The average humidity is 46%.
The average wind speed is of 5,9 kph.


March is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of 15,4 °C, with a minimum of 8,7 °C and a maximum of 22 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 4 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 30 °C.
Rain iconPrecipitation amounts to 65 mm, distributed over 7 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 49%.
The average wind speed is of 6,7 kph.


April is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of 18,2 °C, with a minimum of 10,8 °C and a maximum of 25,5 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 5,5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 34 °C.
Rain iconPrecipitation amounts to 25 mm, distributed over 3 days.
The day lasts on average 13 hours and 5 minutes.
The average humidity is 43%.
The average wind speed is of 8,4 kph.


May is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of 20,5 °C, with a minimum of 13,4 °C and a maximum of 27,6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 9 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 35,5 °C.
Rain iconPrecipitation amounts to only 5 mm, distributed over 2 days.
The day lasts on average 14 hours and 0 minutes.
The average humidity is 46%.
The average wind speed is of 8,6 kph.


June is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of 23,9 °C, with a minimum of 15,9 °C and a maximum of 32 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 12,5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 39 °C.
Rain iconPrecipitation amounts to only 0 mm, so on average it never rains in the whole month.
The day lasts on average 14 hours and 25 minutes. June 21, the winter solstice, is the shortest day of the year in the Southern Hemisphere.
The average humidity is 43%.
The average wind speed is of 8,7 kph.


July is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of 26,9 °C, with a minimum of 18,8 °C and a maximum of 35,1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 14,5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 41 °C.
Rain iconPrecipitation amounts to only 0 mm, so on average it never rains in the whole month.
The day lasts on average 14 hours and 5 minutes.
The average humidity is 40%.
The average wind speed is of 8,8 kph.


August, the hottest month of the year, is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of 27,5 °C, with a minimum of 18,8 °C and a maximum of 36,1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 14,5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 42 °C.
Rain iconPrecipitation amounts to only 5 mm, and all occurs in one day.
The day lasts on average 13 hours and 20 minutes.
The average humidity is 37%.
The average wind speed is of 8,3 kph.


September is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of 25,9 °C, with a minimum of 17,4 °C and a maximum of 34,4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 11,5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 41 °C.
Rain iconPrecipitation amounts to only 5 mm, and all occurs in one day.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 37%.
The average wind speed is of 7,5 kph.


October is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of 21,2 °C, with a minimum of 13,3 °C and a maximum of 29,1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 7,5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 37,5 °C.
Rain iconPrecipitation amounts to 20 mm, distributed over 2 days.
The day lasts on average 11 hours and 20 minutes.
The average humidity is 39%.
The average wind speed is of 6,7 kph.


November is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of 16,3 °C, with a minimum of 8,7 °C and a maximum of 23,9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 2,5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 33 °C.
Rain iconPrecipitation amounts to 35 mm, distributed over 3 days.
The day lasts on average 10 hours and 25 minutes.
The average humidity is 37%.
The average wind speed is of 5,4 kph.


December, the coldest month of the year, is generally a mild month. The average temperature is of 12,5 °C, with a minimum of 6 °C and a maximum of 19 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 26,5 °C.
Rain iconPrecipitation amounts to 60 mm, distributed over 5 days.
The day lasts on average 9 hours and 55 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
The average humidity is 45%.
The average wind speed is of 5,3 kph.

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