Cupertino (CA) Weather & Climate: Best Time to Visit

In Cupertino, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a comfortable 28°C (82°F) in July to a moderate 15°C (59°F) in the coolest month, December.

Nights vary from 14°C (57°F) in July to around 5°C (41°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Cupertino typically sees modest rainfall throughout the year, with an average annual precipitation of 368 mm (14 in). The climate in Cupertino shows significant variation throughout the year. Expect moderate rainfall in December, the wettest month, with an average of 80 mm (3.1 in) of precipitation over 12 rainy days.

In contrast, the driest month July offers drier and sunnier days, with around 0.1 mm (0 in) of rainfall over 0 rainy days. For more details, please visit our Cupertino Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, Cupertino 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.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Cupertino.

The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year