St Helens climate

Name: St Helens
Address: GB

St Helens is warmest in July, with average highs of 19 °C, and coldest in February, when nights average 2.2 °C. December is the wettest month (99 mm) and April the driest (65 mm). Figures are 1991–2020 climate normals.

Across a full year St Helens averages 959 mm of rain, 3 days above 25 °C and 30 days below freezing.

United Kingdom · population 183,200 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 19 °C
Coldest month February 2.2 °C
Driest month April 65 mm
Wettest month December 99 mm
Least cloud May 67 % cloud
Hottest on record July 30 °C
Coldest on record January -8.9 °C
Warmest sea August 17 °C

What to expectSt Helens through the year

St Helens has a clear annual cycle: average daily highs run from 7.4 °C in February to 19 °C in July, a swing of 11 °C in mean temperature across the year.

Counted across a normal year, 3 days a year reach 25 °C, 0 of them reach 30 °C, 30 nights drop below freezing. The warmest reading in the 1991–2020 record is 30 °C, in July.

Rain is spread fairly evenly through the year, from 65 mm in April to 99 mm in December. There is no dry season to aim for.

The sea off St Helens is warmest in August at 17 °C and coldest in February at 6.3 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

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 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days below 0 °C
January	6.9 °C	2.5 °C	4.7 °C	13.2 °C	-8.9 °C	0	7
February	7.4 °C	2.2 °C	4.8 °C	16.0 °C	-7.3 °C	0	7
March	9.4 °C	3.2 °C	6.3 °C	17.6 °C	-5.7 °C	0	4
April	11.9 °C	4.8 °C	8.4 °C	22.5 °C	-3.4 °C	0	1
May	14.9 °C	7.7 °C	11.4 °C	25.8 °C	-0.2 °C	0	0
June	17.3 °C	10.6 °C	14.1 °C	28.8 °C	1.5 °C	1	0
July	19.0 °C	12.6 °C	15.9 °C	30.4 °C	7.0 °C	1	0
August	18.7 °C	12.6 °C	15.7 °C	29.2 °C	6.1 °C	1	0
September	16.7 °C	10.7 °C	13.7 °C	24.8 °C	2.5 °C	0	0
October	13.3 °C	8.1 °C	10.7 °C	24.7 °C	-3.0 °C	0	0
November	9.6 °C	5.2 °C	7.4 °C	16.9 °C	-4.9 °C	0	3
December	7.2 °C	2.9 °C	5.1 °C	14.6 °C	-8.7 °C	0	7

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	80 mm	15	8.1 h/day	74 %	85 %	26 km/h	7.2 °C
February	69 mm	13	9.8 h/day	73 %	82 %	25 km/h	6.3 °C
March	68 mm	13	12 h/day	72 %	80 %	24 km/h	6.6 °C
April	65 mm	12	14 h/day	69 %	77 %	22 km/h	8.6 °C
May	67 mm	13	16 h/day	67 %	76 %	21 km/h	11.2 °C
June	81 mm	13	17 h/day	70 %	77 %	20 km/h	14.0 °C
July	81 mm	14	17 h/day	70 %	78 %	20 km/h	16.1 °C
August	88 mm	15	15 h/day	71 %	79 %	20 km/h	17.0 °C
September	78 mm	13	13 h/day	72 %	80 %	21 km/h	15.8 °C
October	92 mm	15	11 h/day	74 %	82 %	23 km/h	13.5 °C
November	92 mm	16	8.6 h/day	75 %	85 %	24 km/h	11.0 °C
December	99 mm	15	7.5 h/day	74 %	86 %	25 km/h	8.8 °C

Where St Helens ranks

Ranking	Position	Value
The coolest places in Europe in July	24thof 50	19 °C
The coolest places in Europe in June	32ndof 50	17 °C
The coolest places in Europe in August	34thof 50	19 °C
The coolest places in Europe in May	49thof 50	15 °C

Planning a trip? See the best time to visit St Helens.

QuestionsCommon questions about St Helens’s climate

When is the best time to visit St Helens?

That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and April the driest. The month-by-month table above has the full picture.

How hot does St Helens get?

In July, the warmest month, daily highs average 19 °C. About 0 days a year pass 30 °C. The highest value in the 1991–2020 record is 30 °C.

How cold does it get in winter?

Nights average 2.2 °C in February, the coldest month. A normal year has 30 nights below freezing.

Which month is wettest in St Helens?

December, averaging 99 mm over 15 days with rain. The driest month is April with 65 mm. The year as a whole averages 959 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in St Helens rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. 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.