Irvine weather in September
September in Irvine averages 80°F by day and 65°F at night, with 0.1 inches of precipitation. It is the 2nd-warmest and 9th-wettest month of the year here.
- Average high
- 80°F-1° vs August
- Average low
- 65°F0 nights below freezing
- Precipitation
- 0.1 in0 days with 0.1 in. or more
- Snow
- 0.0 in4 days at 90°F+
Is September a good time to visit Irvine?
Yes. September is one of the most comfortable months in Irvine by our rule (highs of 62 to 86°F, lows of 42°F or more and under 4.5 inches of precipitation). The most comfortable months overall are January to December.
On September 15 the sun rises at 6:34 am and sets at 6:57 pm, giving 12h 22m of daylight. Daylight all year.
What to pack for Irvine in September
- Summer clothes, with a light layer for air conditioning
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
September nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| Irvine | 80°F | 65°F | 0.1 in | |
| Tustin, CA | 4 mi | 80°F | 65°F | 0.1 in |
| Santa Ana, CA | 6 mi | 84°F | 64°F | 0.1 in |
| Newport Beach, CA | 6 mi | 74°F | 64°F | 0.1 in |
| Costa Mesa, CA | 6 mi | 80°F | 65°F | 0.1 in |
| Lake Forest, CA | 8 mi | 87°F | 61°F | 0.2 in |
| Orange, CA | 8 mi | 84°F | 64°F | 0.1 in |
Frequently asked questions
What is the weather like in Irvine in September?
In September, Irvine averages a high of 80°F and a low of 65°F, with 0.1 inches of precipitation (NOAA 1991-2020 normals).
Is September a good time to visit Irvine?
Yes. September is one of Irvine's most comfortable months by our rule: highs between 62°F and 86°F, lows of 42°F or more and modest rain.
Does it snow in Irvine in September?
Rarely. The September snowfall normal is under half an inch.
Before and after: Irvine in August and Irvine in October. All twelve months: Irvine weather by month.
NOAA NCEI 1991-2020 climate normals, station Santa Ana John Wayne Airport, CA, 3.1 miles from the city center; snowfall from Tustin Irvine Rch, CA.