Monthly Climate
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Best time to visit Donostia / San Sebastián

July is the best time to visit Donostia / San Sebastián for general sightseeing, with average highs of 22 °C and about 12 wet days. The comfortable season runs roughly June to October. 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 July comfort 84/100
A beach holiday August sea 22 °C
The least cloud August 57 % average cloud cover
The least rain July 81 mm
Warmth August 23 °C
Cooler weather January 11 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 July 84 22 °C 12 62
2 September 83 21 °C 13 55
3 June 83 21 °C 12 46
4 August 83 23 °C 12 67
5 October 77 19 °C 14 34
6 May 73 18 °C 15 20
7 April 60 15 °C 16 4
8 November 57 14 °C 16 8
9 March 57 14 °C 14 2
10 December 49 12 °C 15 1
11 February 48 12 °C 14 3
12 January 46 11 °C 15 1

For a beach holiday

August scores highest, with a sea temperature of 22 °C and air temperatures around 23 °C. The sea is above 20 °C from July to September.

Month Sea Air Sunshine Beach score
January 13 °C 11 °C 70 % 1
February 12 °C 12 °C 66 % 3
March 13 °C 14 °C 64 % 2
April 14 °C 15 °C 66 % 4
May 16 °C 18 °C 66 % 20
June 19 °C 21 °C 63 % 46
July 21 °C 22 °C 59 % 62
August 22 °C 23 °C 57 % 67
September 21 °C 21 °C 57 % 55
October 18 °C 19 °C 63 % 34
November 16 °C 14 °C 68 % 8
December 14 °C 12 °C 70 % 1

When to think twice

January scores lowest with about 15 wet days and highs near 11 °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 11.2 °C 144 mm 70 %
February 11.6 °C 130 mm 66 %
March 13.8 °C 120 mm 64 %
April 15.2 °C 128 mm 66 %
May 18.0 °C 122 mm 66 %
June 20.6 °C 95 mm 63 %
July 22.4 °C 81 mm 59 %
August 23.3 °C 89 mm 57 %
September 21.4 °C 102 mm 57 %
October 18.8 °C 134 mm 63 %
November 14.2 °C 178 mm 68 %
December 11.9 °C 142 mm 70 %

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.