Orange County
September
Weather in Orange County for September 2025
Your guide to Orange County weather in September - trends and predictions
In general, the average temperature in Orange County at the beginning of September is 30.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.9 °F by the end of September.
With an average of 2 rainy days, Orange County experiences minimal rainfall in September, ensuring that most days remain pleasantly dry.
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28
Dry days
2
Rainy days
0
Snow days
26°/17°
Temperatures
16 km/h
Avg max wind
66 %
Avg humidity
Orange County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  30° | 2  29° | 3  28° | 4 29° | 5 31° | 6 33° | 7  34° |
| 8  36° | 9 35° | 10 31° | 11 29° | 12 28° | 13 26° | 14 25° |
| 15 24° | 16 23° | 17 24° | 18 23° | 19 23° | 20 23° | 21 22° |
| 22 27° | 23 28° | 24  27° | 25 27° | 26 26° | 27 28° | 28 27° |
| 29 27° | 30 26° |
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Temperatures trend during September in Orange County
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September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Patchy rain possible | 30° /20° | 1.4 mm | 7 | |
| Sept. 2 | Cloudy | 29° /20° | 0 mm | 7 | |
| Sept. 3 | Overcast | 28° /20° | 0 mm | 7 | |
| Sept. 4 | Overcast | 29° /19° | 0 mm | 7 | |
| Sept. 5 | Overcast | 31° /20° | 0 mm | 8 | |
| Sept. 6 | Overcast | 33° /21° | 0 mm | 8 | |
| Sept. 7 | Partly cloudy | 34° /21° | 0 mm | 9 | |
| Sept. 8 | Sunny | 36° /23° | 0 mm | 8 | |
| Sept. 9 | Sunny | 35° /24° | 0 mm | 9 | |
| Sept. 10 | Cloudy | 31° /22° | 0 mm | 8 | |
| Sept. 11 | Partly cloudy | 29° /21° | 0 mm | 8 | |
| Sept. 12 | Cloudy | 28° /18° | 0 mm | 7 | |
| Sept. 13 | Cloudy | 26° /18° | 0 mm | 6 | |
| Sept. 14 | Overcast | 25° /17° | 0 mm | 7 | |
| Sept. 15 | Overcast | 24° /17° | 0 mm | 6 | |
| Sept. 16 | Overcast | 23° /17° | 0.1 mm | 5 | |
| Sept. 17 | Overcast | 24° /16° | 0 mm | 6 | |
| Sept. 18 | Overcast | 23° /16° | 0 mm | 5 | |
| Sept. 19 | Overcast | 23° /16° | 0 mm | 5 | |
| Sept. 20 | Overcast | 23° /15° | 0 mm | 5 | |
| Sept. 21 | Patchy rain possible | 22° /15° | 0.1 mm | 5 | |
| Sept. 22 | Overcast | 27° /16° | 0 mm | 7 | |
| Sept. 23 | Cloudy | 28° /17° | 0 mm | 7 | |
| Sept. 24 | Mist | 27° /15° | 0 mm | 7 | |
| Sept. 25 | Cloudy | 27° /16° | 0 mm | 7 | |
| Sept. 26 | Overcast | 26° /15° | 0 mm | 7 | |
| Sept. 27 | Partly cloudy | 28° /15° | 0 mm | 7 | |
| Sept. 28 | Partly cloudy | 27° /15° | 0 mm | 7 | |
| Sept. 29 | Overcast | 27° /16° | 0 mm | 7 | |
| Sept. 30 | Light rain shower | 26° /16° | 0.8 mm | 7 | |
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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.
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 26° and lows near 17°, 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 2 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.
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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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