Irvine climate

Name: Irvine
Address: US

Irvine is warmest in August, with average highs of 28 °C, and coldest in January, when nights average 8.6 °C. February is the wettest month (91 mm) and August the driest (0.7 mm). Figures are 1991–2020 climate normals.

Across a full year Irvine averages 363 mm of rain and 125 days above 25 °C.

United States · 17 m elevation · population 256,927 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 28 °C
Coldest month January 8.6 °C
Driest month August 1 mm
Wettest month February 91 mm
Least cloud August 18 % cloud
Hottest on record September 40 °C
Coldest on record January 0.5 °C
Warmest sea August 21 °C

What to expectIrvine through the year

Irvine has a clear annual cycle: average daily highs run from 19 °C in January to 28 °C in August, a swing of 9.8 °C in mean temperature across the year.

Counted across a normal year, 125 days a year reach 25 °C, 26 of them reach 30 °C. The warmest reading in the 1991–2020 record is 40 °C, in September.

Rain is strongly seasonal. February averages 91 mm against 1 mm in August — 131 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Irvine is warmest in August at 21 °C and coldest in February at 15 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	18.7 °C	77 mm	47 %
February	18.7 °C	91 mm	48 %
March	19.6 °C	55 mm	48 %
April	21.1 °C	24 mm	39 %
May	22.3 °C	9 mm	38 %
June	24.6 °C	2 mm	27 %
July	27.1 °C	2 mm	23 %
August	28.2 °C	1 mm	18 %
September	27.6 °C	4 mm	21 %
October	25.1 °C	17 mm	30 %
November	21.8 °C	24 mm	36 %
December	18.4 °C	56 mm	43 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	18.7 °C	8.6 °C	12.9 °C	31.4 °C	0.5 °C	2	0
February	18.7 °C	9.2 °C	13.4 °C	30.6 °C	2.6 °C	2	0
March	19.6 °C	10.5 °C	14.5 °C	32.3 °C	3.9 °C	3	0
April	21.1 °C	11.9 °C	16.0 °C	34.1 °C	4.6 °C	5	1
May	22.3 °C	13.9 °C	17.5 °C	36.6 °C	8.1 °C	6	1
June	24.6 °C	15.7 °C	19.5 °C	36.9 °C	10.6 °C	12	1
July	27.1 °C	18.0 °C	21.9 °C	39.7 °C	13.4 °C	24	4
August	28.2 °C	18.8 °C	22.7 °C	38.0 °C	14.1 °C	27	7
September	27.6 °C	18.2 °C	22.1 °C	40.1 °C	12.7 °C	23	7
October	25.1 °C	15.4 °C	19.6 °C	40.1 °C	9.1 °C	14	4
November	21.8 °C	11.6 °C	16.1 °C	33.5 °C	3.4 °C	6	1
December	18.4 °C	8.6 °C	12.9 °C	29.4 °C	1.2 °C	1	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	77 mm	6	10 h/day	47 %	74 %	12 km/h	15.1 °C
February	91 mm	7	11 h/day	48 %	75 %	13 km/h	15.0 °C
March	55 mm	6	12 h/day	48 %	76 %	14 km/h	15.2 °C
April	24 mm	3	13 h/day	39 %	73 %	16 km/h	15.7 °C
May	9 mm	2	14 h/day	38 %	73 %	15 km/h	17.0 °C
June	2 mm	0	14 h/day	27 %	72 %	14 km/h	18.5 °C
July	2 mm	0	14 h/day	23 %	72 %	13 km/h	20.2 °C
August	1 mm	0	13 h/day	18 %	72 %	13 km/h	20.7 °C
September	4 mm	1	12 h/day	21 %	73 %	13 km/h	20.5 °C
October	17 mm	2	11 h/day	30 %	71 %	13 km/h	19.3 °C
November	24 mm	3	10 h/day	36 %	70 %	12 km/h	17.6 °C
December	56 mm	5	9.9 h/day	43 %	72 %	12 km/h	15.8 °C

How Irvine compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Irvine	28 °C	8.6 °C	363 mm	125
Santa Ana · United States	27 °C	8.4 °C	355 mm	100
Huntington Beach · United States	26 °C	8.4 °C	310 mm	84
Anaheim · United States	29 °C	7.1 °C	317 mm	142
Corona · United States	33 °C	6.1 °C	438 mm	189
Long Beach · United States	28 °C	7.8 °C	291 mm	111

Where Irvine ranks

Ranking	Position	Value
Places with the best weather in North America in May	2nd of 50	96/100
Places with the best weather in North America year-round	3rd of 50	90/100
Places with the best weather in North America in November	10th of 50	96/100
Places with the best weather in North America in April	13th of 50	95/100
Places with the best weather in the world year-round	13th of 50	90/100
Places with the best weather in the world in May	14th of 50	96/100

Planning a trip? See the best time to visit Irvine.

QuestionsCommon questions about Irvine’s climate

When is the best time to visit Irvine?

That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, October sit closest to 20 °C on average, August is the warmest month and August the driest. The month-by-month table above has the full picture.

How hot does Irvine get?

In August, the warmest month, daily highs average 28 °C. About 26 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.

How cold does it get in winter?

Nights average 8.6 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Irvine?

February, averaging 91 mm over 7 days with rain. The driest month is August with 1 mm. The year as a whole averages 363 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Irvine rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 33.669°, -117.823° , 17 m above sea level (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.