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United States weather

Weather in Irvine for September 2025

Your guide to Irvine weather in September - trends and predictions

    Temperatures

  • 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.

    • Rain 🌧️

  • Precipitation in Irvine during September is a rare event, with an average of fewer than 2 rainy days.

    • More

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Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/17°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
68 %
Avg humidity

Irvine in September average weather

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
26°
2
Cloudy
27°
3
Overcast
26°
4
Mist
27°
5
Overcast
28°
6
Overcast
29°
7
Cloudy
30°
8
Sunny
33°
9
Partly cloudy
31°
10
Overcast
29°
11
Cloudy
26°
12
Cloudy
25°
13
Cloudy
24°
14
Cloudy
23°
15
Overcast
23°
16
Mist
22°
17
Mist
22°
18
Mist
22°
19
Mist
21°
20
Patchy rain possible
21°
21
Patchy rain possible
21°
22
Overcast
25°
23
Cloudy
24°
24
Overcast
24°
25
Cloudy
24°
26
Overcast
23°
27
Cloudy
23°
28
Partly cloudy
24°
29
Cloudy
23°
30
Light rain shower
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

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Patchy rain possible
Patchy rain possible
 26° /19° 1.6 mm 7
Sept. 2 Cloudy
Cloudy
 27° /20° 0 mm 7
Sept. 3 Overcast
Overcast
 26° /19° 0 mm 6
Sept. 4 Mist
Mist
 27° /19° 0 mm 7
Sept. 5 Overcast
Overcast
 28° /19° 0 mm 7
Sept. 6 Overcast
Overcast
 29° /21° 0 mm 7
Sept. 7 Cloudy
Cloudy
 30° /20° 0 mm 7
Sept. 8 Sunny
Sunny
 33° /22° 0.1 mm 8
Sept. 9 Partly cloudy
Partly cloudy
 31° /22° 0 mm 8
Sept. 10 Overcast
Overcast
 29° /20° 0 mm 7
Sept. 11 Cloudy
Cloudy
 26° /19° 0 mm 6
Sept. 12 Cloudy
Cloudy
 25° /17° 0 mm 6
Sept. 13 Cloudy
Cloudy
 24° /17° 0 mm 6
Sept. 14 Cloudy
Cloudy
 23° /16° 0 mm 6
Sept. 15 Overcast
Overcast
 23° /17° 0 mm 6
Sept. 16 Mist
Mist
 22° /16° 0.1 mm 5
Sept. 17 Mist
Mist
 22° /16° 0 mm 5
Sept. 18 Mist
Mist
 22° /15° 0 mm 5
Sept. 19 Mist
Mist
 21° /15° 0 mm 5
Sept. 20 Patchy rain possible
Patchy rain possible
 21° /15° 0 mm 5
Sept. 21 Patchy rain possible
Patchy rain possible
 21° /15° 0.1 mm 5
Sept. 22 Overcast
Overcast
 25° /15° 0 mm 6
Sept. 23 Cloudy
Cloudy
 24° /16° 0 mm 6
Sept. 24 Overcast
Overcast
 24° /15° 0 mm 6
Sept. 25 Cloudy
Cloudy
 24° /15° 0 mm 6
Sept. 26 Overcast
Overcast
 23° /13° 0 mm 5
Sept. 27 Cloudy
Cloudy
 23° /14° 0 mm 6
Sept. 28 Partly cloudy
Partly cloudy
 24° /14° 0 mm 6
Sept. 29 Cloudy
Cloudy
 23° /14° 0 mm 6
Sept. 30 Light rain shower
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 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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Location coordinates Where is Irvine?

Get accurate weather forecasts for Irvine, located at latitude 33.669 and longitude -117.823. Stay updated with localized weather information tailored for Irvine.

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