Monthly Climate
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Best time to visit San Diego

October is the best time to visit San Diego for general sightseeing, with average highs of 23 °C and about 2 wet days. The comfortable season runs roughly April to November. 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 October comfort 95/100
A beach holiday August sea 21 °C
The least cloud August 28 % average cloud cover
The least rain June 2 mm
Warmth August 25 °C
Cooler weather December 18 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 95 23 °C 2 76
2 June 95 22 °C 0 70
3 November 94 21 °C 3 60
4 May 94 20 °C 2 59
5 July 92 24 °C 1 83
6 April 91 19 °C 4 50
7 September 90 25 °C 1 87
8 August 89 25 °C 1 89
9 March 85 18 °C 6 39
10 December 84 18 °C 6 39
11 January 83 18 °C 6 37
12 February 82 18 °C 6 34

For a beach holiday

August scores highest, with a sea temperature of 21 °C and air temperatures around 25 °C. The sea is above 20 °C from July to September.

Month Sea Air Sunshine Beach score
January 15 °C 18 °C 45 % 37
February 15 °C 18 °C 49 % 34
March 16 °C 18 °C 49 % 39
April 16 °C 19 °C 44 % 50
May 17 °C 20 °C 47 % 59
June 19 °C 22 °C 36 % 70
July 20 °C 24 °C 33 % 83
August 21 °C 25 °C 28 % 89
September 21 °C 25 °C 29 % 87
October 19 °C 23 °C 35 % 76
November 18 °C 21 °C 37 % 60
December 16 °C 18 °C 42 % 39

When to think twice

February scores lowest with about 6 wet days and highs near 18 °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 17.7 °C 58 mm 45 %
February 17.6 °C 72 mm 49 %
March 18.1 °C 49 mm 49 %
April 19.5 °C 24 mm 44 %
May 20.4 °C 10 mm 47 %
June 22.1 °C 2 mm 36 %
July 24.4 °C 2 mm 33 %
August 25.5 °C 2 mm 28 %
September 25.2 °C 4 mm 29 %
October 23.2 °C 15 mm 35 %
November 20.5 °C 22 mm 37 %
December 17.5 °C 49 mm 42 %

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.