Orange County (Anaheim)
September
Weather in Orange County, California for September 2025
Your guide to Orange County weather in September - trends and predictions
Beach Hazards Statement - See hour by hour.
Until now, September 2025 in Orange County is slightly cooler than the historical average by -1.1 °F.
The forecast for the next days in Orange County predicts temperatures to be around 30 °F, close to the historical average.
In general, the average temperature in Orange County at the beginning of September is 31.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 28.4 °F by the end of September.
Precipitation in Orange County during September is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
Rain 🌧️
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29
Dry days
1
Rainy days
0
Snow days
27°/18°
Temperatures
16 km/h
Avg max wind
61 %
Avg humidity
Orange County Weather September
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Temperatures trend during September in Orange County
See the weather trend as well as the moving average line
September weather in Orange County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 31° /20° | 0.9 mm | 7 | |
| Sept. 2 |  Cloudy | 31° /22° | 0 mm | 7 | |
| Sept. 3 |  Overcast | 31° /21° | 0 mm | 7 | |
| Sept. 4 | Overcast | 30° /20° | 0 mm | 7 | |
| Sept. 5 | Overcast | 31° /20° | 0 mm | 8 | |
| Sept. 6 | Overcast | 33° /20° | 0 mm | 8 | |
| Sept. 7 |  Sunny | 34° /20° | 0 mm | 8 | |
| Sept. 8 | Sunny | 34° /22° | 0 mm | 8 | |
| Sept. 9 | Sunny | 32° /21° | 0 mm | 8 | |
| Sept. 10 | Cloudy | 29° /20° | 0 mm | 7 | |
| Sept. 11 |  Partly cloudy | 27° /20° | 0 mm | 7 | |
| Sept. 12 | Cloudy | 27° /18° | 0 mm | 6 | |
| Sept. 13 | Cloudy | 26° /17° | 0 mm | 6 | |
| Sept. 14 | Overcast | 26° /17° | 0 mm | 6 | |
| Sept. 15 | Sunny | 33° /19° | 0 mm | 1.9 | |
| Sept. 16 | Sunny | 37° /21° | 0 mm | 1.9 | |
| Sept. 17 | Cloudy | 28° /20° | 0 mm | 1.5 | |
| Sept. 18 |  Moderate rain | 26° /22° | 8.3 mm | 1.9 | |
| Sept. 19 | Patchy rain possible | 26° /21° | 3 mm | 0 | |
| Sept. 20 | Sunny | 28° /20° | 0 mm | 6 | |
| Sept. 21 | Sunny | 31° /22° | 0 mm | 7 | |
| Sept. 22 | Sunny | 33° /24° | 0 mm | 7 | |
| Sept. 23 | Sunny | 32° /24° | 0 mm | 7 | |
| Sept. 24 | Sunny | 33° /24° | 0 mm | 7 | |
| Sept. 25 | Sunny | 32° /24° | 0 mm | 7 | |
| Sept. 26 | Sunny | 28° /21° | 0 mm | 6 | |
| Sept. 27 | Sunny | 27° /19° | 0 mm | 6 | |
| Sept. 28 | Sunny | 26° /19° | 0 mm | 6 | |
| Sept. 29 | Overcast | 27° /16° | 0 mm | 7 | |
| Sept. 30 | Light rain shower | 26° /16° | 0.8 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Orange County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Orange County forecast closer to your planned date for the most up-to-date weather information.
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Orange County in September - FAQ
What are the expected maximum and minimum temperatures in Orange County during September?
During September, expect a variety of temperatures with highs around 27° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Orange County during September?
Rainfall in Orange County during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Orange County during September?
The average wind speed in Orange County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Orange County
Explore the daily rainfall trends and prepare for Orange Countys September weather 💧
UV exposure in Orange County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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