San Bruno (CA) Weather and Climate: A Comprehensive Guide
Temperatures see a moderate degree of fluctuation,
transitioning from warm conditions
to mild.
The city tends toward drier weather patterns.
Now, let’s break down all the climate details for a clearer picture.
Average maximum day and minimum night temperature
The climate in San Bruno experiences moderate temperature changes, with mild shifts between seasons. Average daytime temperatures reach a comfortable 23°C in September. In January, the coolest month of the year, temperatures drop to a moderate 14°C.
At night, you can expect cooler temperatures, with averages dropping to around 7°C during this month. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
San Bruno tends toward drier weather patterns, receiving approximately 481 mm of rain per year. San Bruno can be quite wet during December, receiving approximately 113 mm of precipitation over 13 rainy days. In contrast July, experiences much drier conditions, with 0.6 mm of rainfall, spread across a single rainy day. For more details, please visit our San Bruno 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
San Bruno can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 10.8 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 5.3 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 water temperature
The mean water temperature over the year ranges from 12°C in January to 14°C in June.
Water temperature over the year
Average humidity
The relative humidity is high throughout the year in San Bruno.
The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
Average wind speed
The mean wind speed over the year ranges from 3 m/s in January, November and December to 7 m/s in June and July.
The mean monthly wind speed over the year (meters per second)
broken clouds and slight rain broken clouds and chance of slight rain broken clouds and rainForecast for San Bruno (CA)
4 m/s
4 m/s
9 m/s
The best time of year to visit San Bruno in the United States of America
During the months of June, July, August, September and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Yes, the months of May, June, July, August and September are very dry.
September has an average maximum temperature of 23°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 14°C.
December tops the wettest month list with 113 mm of rainfall.
July is the driest month with 1 mm of precipitation.
May is the sunniest month with an average of 324 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.
