Santa Rosa Weather in December

December in Santa Rosa brings very high temperatures around 32°C (90°F) during the day, dropping to 20°C (68°F) at night, with quite a bit of rainfall expected, averaging around 177 mm (7 in) for the month.

Rainfall in Santa Rosa in December

Historically, approximately 11 days this month are expected to have rain, averaging 177 mm (7 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Santa Rosa in December

Temperatures in Santa Rosa in December top out at 32°C (90°F) and drop to 20°C (68°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. Nights cool down to 20°C (68°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit Santa Rosa. Our weather planner can help you explore destinations with more pleasant weather conditions.