Orange County (Anaheim)
September
Weather in Orange County, California for September 2026
Your guide to Orange County weather in September - trends and predictions
So far, September 2026 in Orange County is slightly warmer than the historical average by 1.2 °F.
The forecast for the upcoming days in Orange County predicts a temperature of 28.1 °F, which is slightly above 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 27 °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
28°/19°
Temperatures
16 km/h
Avg max wind
63 %
Avg humidity
Orange County Weather September
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Temperatures trend during September in Orange County
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September weather in Orange County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /19° | 0.7 mm | 8 | |
| Sept. 2 | Sunny | 31° /20° | 0 mm | 8 | |
| Sept. 3 | Sunny | 31° /20° | 0 mm | 8 | |
| Sept. 4 | Sunny | 30° /19° | 0 mm | 8 | |
| Sept. 5 | Sunny | 32° /19° | 0 mm | 8 | |
| Sept. 6 |  Overcast | 32° /20° | 2.5 mm | 6 | |
| Sept. 7 | Sunny | 34° /20° | 0 mm | 7 | |
| Sept. 8 | Sunny | 36° /22° | 0 mm | 9 | |
| Sept. 9 | Sunny | 34° /22° | 0 mm | 8 | |
| Sept. 10 |  Cloudy | 31° /21° | 0 mm | 7 | |
| Sept. 11 |  Partly cloudy | 29° /20° | 0 mm | 7 | |
| Sept. 12 | Sunny | 28° /18° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 26° /18° | 0 mm | 7 | |
| Sept. 14 | Overcast | 26° /18° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 27° /18° | 0 mm | 7 | |
| Sept. 16 | Overcast | 26° /18° | 0 mm | 7 | |
| Sept. 17 | Overcast | 25° /18° | 0 mm | 7 | |
| Sept. 18 | Overcast | 26° /18° | 3.2 mm | 6 | |
| Sept. 19 | Overcast | 26° /18° | 0 mm | 7 | |
| Sept. 20 | Overcast | 25° /17° | 0 mm | 5 | |
| Sept. 21 | Sunny | 24° /20° | 0.1 mm | 7.4 | |
| Sept. 22 | Sunny | 23° /20° | 0 mm | 7.4 | |
| Sept. 23 | Sunny | 26° /21° | 0 mm | 7.4 | |
| Sept. 24 | Sunny | 26° /21° | 0 mm | 7.3 | |
| Sept. 25 | Overcast | 27° /22° | 0 mm | 7.4 | |
| Sept. 26 | Overcast | 28° /23° | 0 mm | 7 | |
| Sept. 27 | Sunny | 27° /22° | 0 mm | 7 | |
| Sept. 28 | Sunny | 26° /21° | 0 mm | 7 | |
| Sept. 29 | Sunny | 27° /22° | 0 mm | 7 | |
| Sept. 30 | Sunny | 28° /22° | 0 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 28° and lows near 19°, 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 💧
Typically, Orange County has 1 rainy days in September with a total of 5.8 mm of rainfall.
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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Where is Orange County?Get accurate weather forecasts for Orange County, located at latitude 33.835 and longitude -117.915. Stay updated with localized weather information tailored for Orange County.
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