Irvine
September
Weather in Irvine for September 2025
Your guide to Irvine weather in September - trends and predictions
In general, the average temperature in Irvine at the beginning of September is 27.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.4 °F by the end of September.
With an average of 2 rainy days, Irvine 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
24°/17°
Temperatures
15 km/h
Avg max wind
72 %
Avg humidity
Irvine in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  26° | 2  27° | 3  26° | 4  27° | 5 28° | 6 29° | 7 30° |
| 8  33° | 9  31° | 10 29° | 11 26° | 12 25° | 13 24° | 14 23° |
| 15 23° | 16 22° | 17 22° | 18 22° | 19 21° | 20 21° | 21 21° |
| 22 25° | 23 24° | 24 24° | 25 24° | 26 23° | 27 23° | 28 24° |
| 29 23° | 30 23° |
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Temperatures trend during September in Irvine
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 | Patchy rain possible | 26° /19° | 1.6 mm | 7 | |
| Sept. 2 | Cloudy | 27° /20° | 0 mm | 7 | |
| Sept. 3 | Overcast | 26° /19° | 0 mm | 6 | |
| Sept. 4 | Mist | 27° /19° | 0 mm | 7 | |
| Sept. 5 | Overcast | 28° /19° | 0 mm | 7 | |
| Sept. 6 | Overcast | 29° /21° | 0 mm | 7 | |
| Sept. 7 | Cloudy | 30° /20° | 0 mm | 7 | |
| Sept. 8 | Sunny | 33° /22° | 0.1 mm | 8 | |
| Sept. 9 | Partly cloudy | 31° /22° | 0 mm | 8 | |
| Sept. 10 | Overcast | 29° /20° | 0 mm | 7 | |
| Sept. 11 | Cloudy | 26° /19° | 0 mm | 6 | |
| Sept. 12 | Cloudy | 25° /17° | 0 mm | 6 | |
| Sept. 13 | Cloudy | 24° /17° | 0 mm | 6 | |
| Sept. 14 | Cloudy | 23° /16° | 0 mm | 6 | |
| Sept. 15 | Overcast | 23° /17° | 0 mm | 6 | |
| Sept. 16 | Mist | 22° /16° | 0.1 mm | 5 | |
| Sept. 17 | Mist | 22° /16° | 0 mm | 5 | |
| Sept. 18 | Mist | 22° /15° | 0 mm | 5 | |
| Sept. 19 | Mist | 21° /15° | 0 mm | 5 | |
| Sept. 20 | Patchy rain possible | 21° /15° | 0 mm | 5 | |
| Sept. 21 | Patchy rain possible | 21° /15° | 0.1 mm | 5 | |
| Sept. 22 | Overcast | 25° /15° | 0 mm | 6 | |
| Sept. 23 | Cloudy | 24° /16° | 0 mm | 6 | |
| Sept. 24 | Overcast | 24° /15° | 0 mm | 6 | |
| Sept. 25 | Cloudy | 24° /15° | 0 mm | 6 | |
| Sept. 26 | Overcast | 23° /13° | 0 mm | 5 | |
| Sept. 27 | Cloudy | 23° /14° | 0 mm | 6 | |
| Sept. 28 | Partly cloudy | 24° /14° | 0 mm | 6 | |
| Sept. 29 | Cloudy | 23° /14° | 0 mm | 6 | |
| Sept. 30 | Light rain shower | 23° /15° | 0.8 mm | 6 | |
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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.
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 24° 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 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.
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