San Bernardino Weather and Climate: A Comprehensive Guide
The climate in San Bernardino is marked by big temperature swings throughout the year.
Temperatures range from pleasant during the warmest months
to very cold in the cooler months.
It also has a notably wet climate with much precipitation.
Now, let’s explore all the climate details to give you a full picture.
Average maximum day and minimum night temperature
In San Bernardino, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a pleasant 18°C in July, the warmest time of the year, to a very cold -3°C during cooler months like January.
At night, temperatures typically drop to an average of around -11°C during these months.Check out our detailed temperature page for more information.
Temperature ranges by month
Precipitation and rainy days
San Bernardino experiences significant rain/snowfall throughout the year, averaging 1593 mm of precipitation annually. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, June receives heavy rainfall, averaging 174 mm of precipitation, recorded across 19 rainy days. In contrast, the drier season, February brings less snowfall, with 77 mm over 15 snowy days. 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 over the year
Seasonal changes in sunshine hours are quite dramatic in San Bernardino. While July receives considerable daily sunshine with up to 6.5 hours, December marks the darkest time of the year, where sunshine is scarce with only 2.4 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in San Bernardino.
The city experiences its highest humidity in September, reaching 75%. In April, the humidity drops to its lowest level at 66%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
overcast and chance of snow overcast and slight snow overcast and heavy snowForecast for San Bernardino
1 m/s
2 m/s
1 m/s
Select a Month of Interest
Check the conditions for any month of the year.
The best time of year to visit San Bernardino in Switzerland
Other facts from our historical weather data:Most rainfall (rainy season) is seen in May, June, July, August, October and November.
July has an average maximum temperature of 18°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of -3°C.
June tops the wettest month list with 174 mm of rainfall.
February is the driest month with 77 mm of precipitation.
July is the sunniest month with an average of 196 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
