Foster City (CA) Climate by Month
The weather in Foster City sees moderate temperature fluctuations over the course of a year.
Temperatures can be warm at the high end
to roughly mild at the low end.
It maintains relatively low levels of precipitation throughout the seasons.
Now, let’s explore all the climate details to give you a full picture.
Average day and night temperature
The climate in Foster City experiences moderate temperature changes, with mild shifts between seasons. On average, daytime temperatures range from a comfortable 24°C in September to a moderate 14°C in January. Nighttime temperatures can drop, with averages reaching 6°C in January.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Foster City tends toward drier weather patterns, receiving approximately 401 mm of rain per year. The seasons in Foster City, bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 96 mm of precipitation. This rainfall is distributed across 12 rainy days. In contrast, the driest month, July, experiences much less rainfall, totaling 0 mm over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.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
In Foster City, summer days are longer and more sunny, with daily sunshine hours peaking at 10.8 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.3 hours.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average water temperature
The mean water temperature over the year in Foster City ranges from 12°C in January to 14°C in June.
Water temperature over the year
Average humidity
The relative humidity is moderate throughout the year in Foster City.
Relative humidity over the year
Average wind speed
The mean wind speed over the year in Foster City ranges from 3°C in January to 7°C in June.
The mean monthly wind speed over the year (meters per second)
The best time of year to visit Foster City in the United States of America
During the months of May, 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 24°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 14°C.
December tops the wettest month list with 96 mm of rainfall.
July is the driest month with 0 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.
