Irvine (CA)
September
Weather in Irvine, California for September 2026
Your guide to Irvine weather in September - trends and predictions
So far, September 2026 in Irvine shows a warmer trend than usual by 2.7 °F.
The forecast for the upcoming days in Irvine predicts a temperature of 31.9 °F, which is slightly above the historical average.
In general, the average temperature in Irvine at the beginning of September is 28.9 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 31 °F by the end of September.
With an average of 2 rainy days, Irvine experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
25°/18°
Temperatures
15 km/h
Avg max wind
70 %
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 |  Sunny | 28° /18° | 0.8 mm | 8 | |
| Sept. 2 | Sunny | 28° /19° | 0 mm | 8 | |
| Sept. 3 | Sunny | 29° /19° | 0 mm | 7 | |
| Sept. 4 | Sunny | 27° /18° | 0 mm | 8 | |
| Sept. 5 | Sunny | 30° /18° | 0 mm | 8 | |
| Sept. 6 |  Overcast | 29° /20° | 3.1 mm | 6 | |
| Sept. 7 |  Cloudy | 31° /19° | 0 mm | 6 | |
| Sept. 8 | Sunny | 34° /21° | 0 mm | 8 | |
| Sept. 9 |  Partly cloudy | 31° /21° | 0 mm | 7 | |
| Sept. 10 | Overcast | 29° /20° | 0 mm | 7 | |
| Sept. 11 | Sunny | 26° /19° | 0 mm | 7 | |
| Sept. 12 | Cloudy | 25° /18° | 0 mm | 7 | |
| Sept. 13 | Cloudy | 25° /17° | 0 mm | 6 | |
| Sept. 14 | Cloudy | 25° /17° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 25° /17° | 0 mm | 7 | |
| Sept. 16 |  Mist | 25° /17° | 0.1 mm | 6 | |
| Sept. 17 | Overcast | 24° /17° | 0 mm | 6 | |
| Sept. 18 | Overcast | 24° /17° | 2.3 mm | 6 | |
| Sept. 19 | Cloudy | 24° /16° | 0 mm | 6 | |
| Sept. 20 |  Patchy rain possible | 24° /16° | 0 mm | 5 | |
| Sept. 21 | Sunny | 25° /18° | 0 mm | 7.5 | |
| Sept. 22 | Sunny | 27° /19° | 0 mm | 7.5 | |
| Sept. 23 | Sunny | 30° /20° | 0 mm | 7.4 | |
| Sept. 24 | Sunny | 30° /20° | 0 mm | 7.4 | |
| Sept. 25 | Overcast | 32° /21° | 0 mm | 7.4 | |
| Sept. 26 | Overcast | 32° /23° | 0 mm | 7 | |
| Sept. 27 | Sunny | 30° /22° | 0 mm | 8 | |
| Sept. 28 | Sunny | 30° /20° | 0 mm | 7 | |
| Sept. 29 | Sunny | 31° /22° | 0 mm | 8 | |
| Sept. 30 | Sunny | 32° /21° | 0 mm | 8 | |
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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 18°, 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 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 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 💧
Typically, Irvine has 2 rainy days in September with a total of 4.9 mm of rainfall.
UV exposure in Irvine during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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