Monthly Climate
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Best time to visit St Helens

July is the best time to visit St Helens for general sightseeing, with average highs of 19 °C and about 14 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 July comfort 76/100
A beach holiday August sea 17 °C
The least cloud May 67 % average cloud cover
The least rain April 65 mm
Warmth July 19 °C
Cooler weather January 6.9 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 July 76 19 °C 14 26
2 August 74 19 °C 15 28
3 June 71 17 °C 13 15
4 September 69 17 °C 13 21
5 May 61 15 °C 13 8
6 October 52 13 °C 15 1
7 April 48 12 °C 12 6
8 March 36 9.4 °C 13 4
9 November 34 9.6 °C 16 0
10 February 28 7.4 °C 13 4
11 December 24 7.2 °C 15 0
12 January 23 6.9 °C 15 0

For a beach holiday

August scores highest, with a sea temperature of 17 °C and air temperatures around 19 °C. The sea never reaches 20 °C here.

Month Sea Air Sunshine Beach score
January 7.2 °C 6.9 °C 74 % 0
February 6.3 °C 7.4 °C 73 % 4
March 6.6 °C 9.4 °C 72 % 4
April 8.6 °C 12 °C 69 % 6
May 11 °C 15 °C 67 % 8
June 14 °C 17 °C 70 % 15
July 16 °C 19 °C 70 % 26
August 17 °C 19 °C 71 % 28
September 16 °C 17 °C 72 % 21
October 14 °C 13 °C 74 % 1
November 11 °C 9.6 °C 75 % 0
December 8.8 °C 7.2 °C 74 % 0

When to think twice

January scores lowest with about 15 wet days and highs near 6.9 °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 6.9 °C 80 mm 74 %
February 7.4 °C 69 mm 73 %
March 9.4 °C 68 mm 72 %
April 11.9 °C 65 mm 69 %
May 14.9 °C 67 mm 67 %
June 17.3 °C 81 mm 70 %
July 19.0 °C 81 mm 70 %
August 18.7 °C 88 mm 71 %
September 16.7 °C 78 mm 72 %
October 13.3 °C 92 mm 74 %
November 9.6 °C 92 mm 75 %
December 7.2 °C 99 mm 74 %

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.