Monthly Climate
Menu

Best time to visit Swansea

August is the best time to visit Swansea for general sightseeing, with average highs of 19 °C and about 15 wet days. The comfortable season runs roughly June 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 August comfort 74/100
A beach holiday August sea 18 °C
The least cloud April 66 % average cloud cover
The least rain April 76 mm
Warmth July 19 °C
Cooler weather January 7.7 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 August 74 19 °C 15 30
2 July 74 19 °C 15 25
3 September 71 17 °C 12 27
4 June 70 17 °C 14 14
5 May 60 15 °C 14 5
6 October 54 14 °C 15 4
7 April 49 12 °C 13 4
8 November 39 11 °C 16 0
9 March 38 9.5 °C 13 4
10 February 31 7.9 °C 13 4
11 December 30 8.3 °C 15 0
12 January 26 7.7 °C 16 0

For a beach holiday

August scores highest, with a sea temperature of 18 °C and air temperatures around 19 °C. The sea never reaches 20 °C here.

Month Sea Air Sunshine Beach score
January 8.1 °C 7.7 °C 74 % 0
February 7.5 °C 7.9 °C 72 % 4
March 7.7 °C 9.5 °C 70 % 4
April 9.2 °C 12 °C 66 % 4
May 11 °C 15 °C 67 % 5
June 14 °C 17 °C 69 % 14
July 16 °C 19 °C 69 % 25
August 18 °C 19 °C 70 % 30
September 17 °C 17 °C 69 % 27
October 15 °C 14 °C 72 % 4
November 12 °C 11 °C 74 % 0
December 9.7 °C 8.3 °C 73 % 0

When to think twice

January scores lowest with about 16 wet days and highs near 7.7 °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 7.7 °C 124 mm 74 %
February 7.9 °C 95 mm 72 %
March 9.5 °C 83 mm 70 %
April 11.8 °C 76 mm 66 %
May 14.7 °C 83 mm 67 %
June 17.0 °C 86 mm 69 %
July 18.6 °C 95 mm 69 %
August 18.6 °C 100 mm 70 %
September 16.9 °C 93 mm 69 %
October 13.8 °C 133 mm 72 %
November 10.6 °C 127 mm 74 %
December 8.3 °C 137 mm 73 %

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.