Sunnyvale (CA) Sunshine Hours by Month

When exploring climate, sunlight hours tell an important story. This page shows the total number of hours of direct sunlight per month and the average hours per day in Sunnyvale, California, United States of America. The numbers reflect climate data gathered over a 30-year period, from 1990 to 2020.

Monthly hours of sunshine

Sunshine in Sunnyvale varies greatly throughout the year. The sunniest month, May, reaches an impressive 324 hours, while December, the darkest month, offers only 160 hours. The total annual amount of sun is 3058 hours.

Daily hours of sunshine

For those who appreciate different seasons, Sunnyvale serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 10.8 hours of sunshine daily, and embrace the darker days in December, offering only 5.3 hours of daily sunlight.

Average percent of sunshine

On average the sun shines 78% of the time during the day in April, the highest percentage of any month. December has the lowest percentage at 54%.

Sunnyvale enjoys an average of 3058 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

Seville, Spain, enjoys an impressive 2920 hours of sunshine per year, making it an ideal destination even in winter.

In contrast, Juneau, Alaska, receives only about 1523 hours of sunshine per year and is known for its very short days in winter and frequently overcast conditions.

Toronto, Canada, sees around 2071 hours of sunshine each year, with especially long, bright summer days.

Perth, Australia, enjoys 3180 hours of sunshine annually, the highest among major Australian cities.

December, Sunnyvale’s wettest month, receives 2.8 mm (0.1 in) of rainfall and has a maximum daytime temperature of 15°C (59°F). During the driest month July you can expect a temperature of 26°C (79°F).

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