Castaic Weather in December

December in Castaic averages 18°C (64°F) during the day and 6°C (43°F) at night. It is the wettest month of the year, with 63 mm (2.5 in) of rainfall on average, so waterproof gear is a must.

Rainfall in Castaic in December

Given that this is the rainiest month, it's wise to carry an umbrella to stay dry during unexpected showers. Analyzing past climate data, one can expect approximately 8 days of rain, averaging 63 mm (2.5 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 Castaic in December

December in Castaic sees highs of 18°C (64°F) and lows of 6°C (43°F) overnight. The winter season takes place during December. The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 6°C (43°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep. Experience the year's lowest temperatures this month, but they are still mild and pleasant.

Sunshine in Castaic in December

There are approximately 220 hours of sunshine this month, resulting in mostly clear days.

If you prefer enjoying temperate temperatures and rain-free days, February, March, April, May, October and November typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.