When to go · Simi Valley
Simi Valley in December
Mixed month. Outside the best window (Mar–May, Oct–Nov). Across United States: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.
Key facts
- Verdict
- Mixed
- Temperature
- 20°C (68°F)68°F (20°C) / 3°C (37°F)37°F (3°C)
- average high / low
- Rain days
- 5
- Crowds
- High
- United States overall
- Prices
- High
- United States overall
Verdict
Outside the best window (Mar–May, Oct–Nov). Across United States: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.
Is another month better than December?
December is rated mixed. These months rate higher:
Weather in December
- Simi ValleyHighs around 20 °C (68 °F), lows around 3 °C (37 °F), rain on about 5 daysHighs around 68 °F (20 °C), lows around 37 °F (3 °C), rain on about 5 days
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Christmas Day big impact
25 Dec · United States
Most businesses closed; flights full from about 20 Dec to 2 Jan.
Crowds and prices
- Crowds · United States overall
- High
- Prices · United States overall
- High
United States overall: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.
High-price month: see what to book ahead.
Compare two months
Weather, crowds and prices for any two months in Simi Valley, side by side.
Verdict
Dec: Mixed
Mar: Great (better)
Daytime high
Dec: 20 °C (68 °F)68 °F (20 °C)
Mar: 23 °C (73 °F)73 °F (23 °C)
Night low
Dec: 3 °C (37 °F)37 °F (3 °C)
Mar: 6 °C (43 °F)43 °F (6 °C)
Rain days
Dec: 5
Mar: 5
Crowds
Dec: High
Mar: Medium
Prices
Dec: High
Mar: Medium
Festivals listed
Dec: 1
Mar: 2
December: Outside the best window (Mar–May, Oct–Nov). Across United States: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.
March: Inside Simi Valley's best window: Mar–May, Oct–Nov.
Simi Valley: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm coat, hat and gloves for mornings and evenings