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 33.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 31.3 °F by the end of September.
Orange County experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
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9
Dry days
21
Rainy days
0
Snow days
32°/23°
Temperatures
15 km/h
Avg max wind
72 %
Avg humidity
Orange County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  32° | 2  32° | 3  32° | 4  34° | 5  34° | 6 34° | 7 34° |
| 8 32° | 9  33° | 10 32° | 11 32° | 12 34° | 13 34° | 14 34° |
| 15 32° | 16 31° | 17 32° | 18 32° | 19 30° | 20  31° | 21 31° |
| 22 30° | 23 33° | 24 33° | 25  32° | 26 30° | 27 31° | 28 30° |
| 29 31° | 30 32° |
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Temperatures trend during September in Orange County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Moderate or heavy rain shower | 32° /24° | 14.2 mm | 7 | |
| Sept. 2 | Light rain shower | 32° /23° | 0.8 mm | 7 | |
| Sept. 3 | Cloudy | 32° /24° | 0.5 mm | 7 | |
| Sept. 4 | Partly cloudy | 34° /24° | 1.6 mm | 8 | |
| Sept. 5 | Overcast | 34° /24° | 3.7 mm | 7 | |
| Sept. 6 | Cloudy | 34° /23° | 4.9 mm | 8 | |
| Sept. 7 | Cloudy | 34° /24° | 9.7 mm | 8 | |
| Sept. 8 | Moderate or heavy rain shower | 32° /22° | 23.3 mm | 7 | |
| Sept. 9 | Mist | 33° /22° | 6.5 mm | 7 | |
| Sept. 10 | Fog | 32° /24° | 8.1 mm | 7 | |
| Sept. 11 | Fog | 32° /24° | 7.1 mm | 7 | |
| Sept. 12 | Fog | 34° /24° | 1.6 mm | 7 | |
| Sept. 13 | Fog | 34° /24° | 8.3 mm | 8 | |
| Sept. 14 | Moderate or heavy rain shower | 34° /24° | 5.6 mm | 7 | |
| Sept. 15 | Light rain shower | 32° /24° | 3.2 mm | 7 | |
| Sept. 16 | Moderate or heavy rain shower | 31° /23° | 12.3 mm | 7 | |
| Sept. 17 | Light rain shower | 32° /24° | 15.7 mm | 7 | |
| Sept. 18 | Light rain shower | 32° /23° | 32.4 mm | 7 | |
| Sept. 19 | Overcast | 30° /24° | 1.5 mm | 7 | |
| Sept. 20 | Patchy light rain with thunder | 31° /22° | 21.4 mm | 7 | |
| Sept. 21 | Moderate or heavy rain shower | 31° /22° | 5.9 mm | 8 | |
| Sept. 22 | Patchy rain possible | 30° /23° | 0 mm | 8 | |
| Sept. 23 | Partly cloudy | 33° /21° | 0 mm | 8 | |
| Sept. 24 | Light rain shower | 33° /23° | 2.1 mm | 8 | |
| Sept. 25 | Patchy light rain | 32° /24° | 9.9 mm | 7 | |
| Sept. 26 | Moderate or heavy rain shower | 30° /24° | 62.1 mm | 7 | |
| Sept. 27 | Moderate or heavy rain shower | 31° /24° | 22.7 mm | 7 | |
| Sept. 28 | Light rain shower | 30° /24° | 4.3 mm | 8 | |
| Sept. 29 | Light rain shower | 31° /23° | 31.6 mm | 7 | |
| Sept. 30 | Moderate or heavy rain shower | 32° /23° | 29.8 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 32° and lows near 23°, suitable for diverse activities and preferences.
How much rainfall should be expected in Orange County during September?
Significant rainfall exceeding 346.4 mm is expected in Orange County during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Orange County during September?
The average wind speed in Orange County during September is 15 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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