Cupertino Weather in December

Cupertino in December averages 15°C (59°F) during the day and 5°C (41°F) at night. This is the wettest month of the year, and part of the winter season.

Rainfall in Cupertino in December

With the most rainfall occurring this month, it's practical to keep an umbrella handy for sudden downpours. You can typically expect 12 days of rain this month, averaging around 80 mm (3.1 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Cupertino in December

Daytime temperatures in Cupertino reach 15°C (59°F) in December, dropping to 5°C (41°F) at night. December marks the winter season. The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 5°C (41°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep. During December, the city enjoys the most temperate climate of the year.

Sunshine in Cupertino in December

The city usually sees around 160 hours of sunlight, indicating a moderately sunny period.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Cupertino. Our weather planner can help you explore destinations with more pleasant weather conditions.