Monthly Climate
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Best time to visit Saint Helier

August is the best time to visit Saint Helier for general sightseeing, with average highs of 19 °C and about 10 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 77/100
A beach holiday August sea 18 °C
The least cloud July 54 % average cloud cover
The least rain July 49 mm
Warmth August 19 °C
Cooler weather February 8.7 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 August 77 19 °C 10 41
2 July 76 18 °C 9 36
3 September 72 18 °C 11 34
4 June 71 16 °C 9 22
5 May 61 14 °C 10 11
6 October 57 15 °C 15 11
7 April 50 11 °C 11 9
8 November 43 12 °C 17 0
9 March 39 9.8 °C 13 5
10 December 34 10 °C 17 0
11 February 34 8.7 °C 13 5
12 January 32 9.1 °C 15 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 9.5 °C 9.1 °C 74 % 0
February 8.7 °C 8.7 °C 70 % 5
March 8.7 °C 9.8 °C 66 % 5
April 10 °C 11 °C 59 % 9
May 12 °C 14 °C 61 % 11
June 15 °C 16 °C 57 % 22
July 17 °C 18 °C 54 % 36
August 18 °C 19 °C 57 % 41
September 18 °C 18 °C 59 % 34
October 16 °C 15 °C 68 % 11
November 14 °C 12 °C 73 % 0
December 11 °C 10 °C 73 % 0

When to think twice

January scores lowest with about 15 wet days and highs near 9.1 °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 9.1 °C 108 mm 74 %
February 8.7 °C 80 mm 70 %
March 9.8 °C 69 mm 66 %
April 11.4 °C 57 mm 59 %
May 13.9 °C 54 mm 61 %
June 16.3 °C 53 mm 57 %
July 18.1 °C 49 mm 54 %
August 18.6 °C 65 mm 57 %
September 17.6 °C 74 mm 59 %
October 15.2 °C 119 mm 68 %
November 12.2 °C 131 mm 73 %
December 10.0 °C 134 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.