Irvine (CA)
September
Weather in Irvine, California for September 2025
Your guide to Irvine weather in September - trends and predictions
Beach Hazards Statement - See hour by hour.
Until now, September 2025 in Irvine is slightly cooler than the historical average by -1.3 °F.
The forecast for the next days in Irvine predicts temperatures to be around 26 °F, close to the historical average.
In general, the average temperature in Irvine at the beginning of September is 28.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.4 °F by the end of September.
Precipitation in Irvine during September is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
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29
Dry days
1
Rainy days
0
Snow days
25°/17°
Temperatures
15 km/h
Avg max wind
68 %
Avg humidity
Irvine Weather September
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Temperatures trend during September in Irvine
See the weather trend as well as the moving average line
September weather in Irvine day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 27° /18° | 1.1 mm | 7 | |
| Sept. 2 |  Cloudy | 28° /20° | 0 mm | 7 | |
| Sept. 3 |  Overcast | 29° /20° | 0 mm | 6 | |
| Sept. 4 |  Mist | 27° /19° | 0 mm | 7 | |
| Sept. 5 | Overcast | 28° /19° | 0 mm | 7 | |
| Sept. 6 | Overcast | 28° /19° | 0 mm | 7 | |
| Sept. 7 | Cloudy | 30° /19° | 0 mm | 7 | |
| Sept. 8 |  Sunny | 31° /20° | 0 mm | 7 | |
| Sept. 9 |  Partly cloudy | 28° /20° | 0 mm | 7 | |
| Sept. 10 | Overcast | 26° /19° | 0 mm | 6 | |
| Sept. 11 | Cloudy | 25° /18° | 0 mm | 6 | |
| Sept. 12 | Cloudy | 24° /17° | 0 mm | 6 | |
| Sept. 13 | Cloudy | 23° /16° | 0 mm | 5 | |
| Sept. 14 | Cloudy | 24° /16° | 0 mm | 5 | |
| Sept. 15 | Partly cloudy | 28° /19° | 0 mm | 1.9 | |
| Sept. 16 | Partly cloudy | 31° /20° | 0 mm | 1.9 | |
| Sept. 17 | Partly cloudy | 28° /20° | 0 mm | 1.6 | |
| Sept. 18 |  Moderate rain | 26° /22° | 14.6 mm | 1.9 | |
| Sept. 19 | Patchy rain possible | 26° /22° | 1.7 mm | 0 | |
| Sept. 20 | Sunny | 27° /22° | 0 mm | 6 | |
| Sept. 21 | Sunny | 27° /22° | 0 mm | 6 | |
| Sept. 22 | Patchy rain possible | 25° /21° | 0.8 mm | 5 | |
| Sept. 23 | Sunny | 25° /19° | 0 mm | 6 | |
| Sept. 24 | Partly cloudy | 28° /21° | 0 mm | 6 | |
| Sept. 25 | Sunny | 28° /22° | 0 mm | 6 | |
| Sept. 26 | Sunny | 24° /20° | 0 mm | 6 | |
| Sept. 27 | Sunny | 23° /18° | 0 mm | 5 | |
| Sept. 28 | Patchy rain possible | 22° /18° | 0.2 mm | 4 | |
| Sept. 29 | Cloudy | 23° /14° | 0 mm | 6 | |
| Sept. 30 | Light rain shower | 23° /15° | 0.8 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Irvine 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 Irvine forecast closer to your planned date for the most up-to-date weather information.
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Irvine in September - FAQ
What are the expected maximum and minimum temperatures in Irvine during September?
During September, expect a variety of temperatures with highs around 25° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Irvine during September?
Rainfall in Irvine 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 Irvine during September?
The average wind speed in Irvine during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Irvine
Explore the daily rainfall trends and prepare for Irvines September weather 💧
UV exposure in Irvine during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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