Average Monthly Sunshine in Foster City (CA)

The graphs on this page shows the average number of hours per month and per day that Foster City receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.

Monthly hours of sunshine

Those who love seasonal contrasts will appreciate Foster City. Expect long, bright days with 324 hours in May and darker periods with just 160 hours in December. The total annual amount of sun is 3072 hours.

Daily hours of sunshine

This means the city 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.

Foster City’s total hours of sunshine compared to other major cities

Foster City enjoys an average of 3072 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

Athens, Greece, enjoys 2769 hours of sunshine each year, making it one of the sunniest destinations in the Mediterranean region.

Boston, USA, enjoys 2629 hours of sunshine annually, with distinct seasons and many bright, sunny days.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 2520 hours of sunshine annually.

In Tokyo, Japan, the average annual sunshine is 1930 hours, with sunny periods between rainy seasons.

Other climate information

December, Foster City’s wettest month, receives 3.5 mm of rainfall and has a maximum daytime temperature of 14°C. During the driest month July you can expect a temperature of 24°C.

For more detailed insights into the city’s temperatures, check out our Temperature page. To explore more about precipitation patterns, visit our Foster City Precipitation page.