Sunnyvale Weather in December

With daytime temperatures of 15°C (59°F) and nighttime lows of 5°C (41°F), December in Sunnyvale brings moderate temperatures during the day. It is also the wettest month of the year, so pack an umbrella.

Rainfall in Sunnyvale in December

Prepare for the wettest month with an umbrella to protect yourself from frequent rain. Typically, you can expect about 11 days of rain this month, with 70 mm (2.8 in) on average. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Sunnyvale in December

December in Sunnyvale brings moderate temperatures, with highs of 15°C (59°F) and nights around 5°C (41°F). The month of December belongs to the winter season. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 5°C (41°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. During this period, the city experiences its coolest temperatures annually.

Sunshine in Sunnyvale 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 Sunnyvale. Our weather planner can help you explore destinations with more pleasant weather conditions.