Weather · September
Orange County weather in September
Average highs of 87°F, lows of 61°F and 0.20 in of rain, from 30 years of weather records.
September is Orange County’s 2nd warmest month, with average highs of 87°F and lows of 61°F. That is about the same as August, and 10° above the yearly average high.
- Average high
- 87°F
- Average low
- 61°F
- Precipitation
- 0.20 in
- Wet days
- 0
- Sunrise · sunset
- 6:34 AM · 6:58 PM
What to wear in September
- Warm days: shorts and T-shirts.
What September weather is good for
What’s on in Orange County in September
Guides for this month: Halloween in Orange County.
See all upcoming events.
September compared with the months around it
Planning a trip? See the best time to visit Orange County and today’s forecast.
Questions
How hot does it get in Orange County in September?
Average highs are 87°F and average lows 61°F, for a daily mean of 74°F. Individual days run hotter or colder than these 30-year averages.
Does it rain in Orange County in September?
September averages 0.20 in of precipitation over about 0 days with at least 0.01 in. It is the 9th wettest month of the year.
What time is sunset in Orange County in September?
Around mid-September the sun rises about 6:34 AM and sets about 6:58 PM, for roughly 12.4 hours of daylight.
Is September a good time to visit Orange County?
The mildest months for visiting are May, June, October. September is warm, with Halloween events.
NOAA U.S. Climate Normals 1991–2020, Tustin Irvine Rch station (0.4 mi from downtown). Sunrise and sunset are calculated for September 15 at the city’s coordinates.