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.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Castaic's climate page.

Castaic Temperature in December

Min Temperature 6°C (43°F)  

Max Temperature 18°C (64°F)  

Chance of Rain 27%  

Precipitation 63 mm (2.5 in)  

Rainy days 8 days  

Humidity 52% *  

Sunshine 220 hours *  

Percentage Sunshine 71% *  

* Data from: Los Angeles, the United States of America (65 KM, 40 Miles).

What to Wear in Castaic in December

Pleasant temperatures in December mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Castaic in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Castaic's climate page.

More climate data for Castaic

Temperature Rainfall Sunshine Humidity

See the full Castaic climate overview or explore weather in the United States of America.