Average humidity in Foster City (CA)
On this page you find more information about the monthly relative humidity over the year in Foster City (California), the United States of America.
Foster City's humidity levels vary throughout the year. The highest levels occur in January, reaching 80% (very high), while the lowest is recorded in June at 71%.
Throughout the year, the average humidity in Foster City is 75%.
Humidity plays an important role in how temperatures are felt. During the warmest month, September, the maximum average temperature is around 24°C (75°F). Combined with high humidity during this period, the temperature can feel even warmer than the thermometer shows.
During the coldest month, December, the maximum average temperature is around 14°C (57°F). This period has high humidity. Check out our detailed temperature page for more information.
Foster City Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Foster City - and find the best time to visit.
Foster City 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Foster City climate overview or explore weather in the United States of America.
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