Simi Valley Weather in December

Simi Valley in December sees moderate temperatures, with highs around 18°C (64°F) and overnight lows of 7°C (45°F). Rainfall is fairly high at around 62 mm (2.4 in) on average, so pack waterproofs just in case.

Rainfall in Simi Valley in December

This month experiences about 7 days of rain according to historical data, averaging 62 mm (2.4 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 Simi Valley in December

Daytime highs in Simi Valley in December reach 18°C (64°F), with nights around 7°C (45°F). During December, you'll experience the winter season. The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 7°C (45°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep. The weather this month is milder than usual, but still provides a warm and pleasant atmosphere.

Sunshine in Simi Valley in December

Enjoy a sunny month with about 220 hours of sunshine, the clear skies make Simi Valley even more beautiful.

December in Simi Valley can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.