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.

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

Simi Valley Temperature in December

Min Temperature 7°C (45°F)  

Max Temperature 18°C (64°F)  

Chance of Rain 23%  

Precipitation 62 mm (2.4 in)  

Rainy days 7 days  

Humidity 52% *  

Sunshine 220 hours *  

Percentage Sunshine 71% *  

* Data from: Los Angeles, the United States of America (51 KM, 31 Miles).

What to Wear in Simi Valley in December

Comfortable temperatures call for an easy wardrobe in December. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Simi Valley 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 Simi Valley's climate page.

More climate data for Simi Valley

Temperature Rainfall Sunshine Humidity

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