When to go · Simi Valley
Simi Valley in September
Avoid month. Listed as a month to avoid: Jul–Sep (inland heat, often 35 °C (95 °F)+), Thanksgiving, Christmas and New Year's Day at the Reagan Library.Avoid month. Listed as a month to avoid: Jul–Sep (inland heat, often 95 °F (35 °C)+), Thanksgiving, Christmas and New Year's Day at the Reagan Library.
Key facts
- Verdict
- Avoid
- Temperature
- 34°C (93°F)93°F (34°C) / 13°C (55°F)55°F (13°C)
- average high / low
- Rain days
- 0
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Listed as a month to avoid: Jul–Sep (inland heat, often 35 °C (95 °F)+), Thanksgiving, Christmas and New Year's Day at the Reagan Library.Listed as a month to avoid: Jul–Sep (inland heat, often 95 °F (35 °C)+), Thanksgiving, Christmas and New Year's Day at the Reagan Library.
Is another month better than September?
September is rated avoid. These months rate higher:
Weather in September
- Simi ValleyHighs around 34 °C (93 °F), lows around 13 °C (55 °F), rain on about 0 daysHighs around 93 °F (34 °C), lows around 55 °F (13 °C), rain on about 0 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.
Labor Day big impact
1st Monday of September · United States
End of summer; last big road-trip weekend.
Crowds and prices
- Crowds · United States overall
- Medium
- Prices · United States overall
- Medium
United States overall: After Labor Day the crowds drop and parks stay open; Florida and the Gulf are at hurricane peak.
Compare two months
Weather, crowds and prices for any two months in Simi Valley, side by side.
Verdict
Sep: Avoid
Mar: Great (better)
Daytime high
Sep: 34 °C (93 °F)93 °F (34 °C)
Mar: 23 °C (73 °F)73 °F (23 °C)
Night low
Sep: 13 °C (55 °F)55 °F (13 °C)
Mar: 6 °C (43 °F)43 °F (6 °C)
Rain days
Sep: 0 (better)
Mar: 5
Crowds
Sep: Medium
Mar: Medium
Prices
Sep: Medium
Mar: Medium
Festivals listed
Sep: 1
Mar: 2
September: Listed as a month to avoid: Jul–Sep (inland heat, often 35 °C+), Thanksgiving, Christmas and New Year's Day at the Reagan Library.
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
- Light, breathable clothes, a sun hat and sunscreen