Monthly Climate
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Best time to visit Irvine

May is the best time to visit Irvine for general sightseeing, with average highs of 22 °C and about 2 wet days. The comfortable season runs roughly March to July. The sea stays above 20 °C from July to September.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking May comfort 96/100
A beach holiday August sea 21 °C
The least cloud August 18 % average cloud cover
The least rain August 1 mm
Warmth August 28 °C
Cooler weather December 18 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 May 96 22 °C 2 65
2 November 96 22 °C 3 65
3 April 95 21 °C 3 55
4 June 94 25 °C 0 78
5 October 93 25 °C 2 82
6 March 90 20 °C 6 43
7 December 87 18 °C 5 42
8 July 87 27 °C 0 88
9 January 86 19 °C 6 39
10 February 85 19 °C 7 37
11 September 84 28 °C 1 89
12 August 83 28 °C 0 90

For a beach holiday

August scores highest, with a sea temperature of 21 °C and air temperatures around 28 °C. The sea is above 20 °C from July to September.

Month Sea Air Sunshine Beach score
January 15 °C 19 °C 47 % 39
February 15 °C 19 °C 48 % 37
March 15 °C 20 °C 48 % 43
April 16 °C 21 °C 39 % 55
May 17 °C 22 °C 38 % 65
June 19 °C 25 °C 27 % 78
July 20 °C 27 °C 23 % 88
August 21 °C 28 °C 18 % 90
September 21 °C 28 °C 21 % 89
October 19 °C 25 °C 30 % 82
November 18 °C 22 °C 36 % 65
December 16 °C 18 °C 43 % 42

When to think twice

August scores lowest with about 0 wet days and highs near 28 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

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 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. 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.