Saint Peter Port climate

Name: Saint Peter Port
Address: GG

Saint Peter Port is warmest in August, with average highs of 17 °C, and coldest in February, when nights average 7.1 °C. November is the wettest month (123 mm) and July the driest (37 mm). Figures are 1991–2020 climate normals.

Across a full year Saint Peter Port averages 876 mm of rain and 0 days below freezing.

Guernsey · population 16,488 · 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 August 17 °C
Coldest month February 7.1 °C
Driest month July 37 mm
Wettest month November 123 mm
Least cloud July 54 % cloud
Hottest on record July 23 °C
Coldest on record February -3.4 °C
Warmest sea September 17 °C

What to expectSaint Peter Port through the year

Saint Peter Port has a clear annual cycle: average daily highs run from 9.0 °C in February to 17 °C in August, a swing of 8.6 °C in mean temperature across the year.

Counted across a normal year, 0 nights drop below freezing. The warmest reading in the 1991–2020 record is 23 °C, in July.

Rain is strongly seasonal. November averages 123 mm against 37 mm in July — 3.3 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Saint Peter Port is warmest in September at 17 °C and coldest in March at 9.2 °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	9.7 °C	99 mm	75 %
February	9.0 °C	76 mm	71 %
March	9.5 °C	60 mm	67 %
April	10.5 °C	51 mm	59 %
May	12.4 °C	45 mm	60 %
June	14.5 °C	43 mm	57 %
July	16.4 °C	37 mm	54 %
August	17.3 °C	52 mm	57 %
September	16.8 °C	58 mm	59 %
October	15.2 °C	109 mm	69 %
November	12.7 °C	123 mm	73 %
December	10.7 °C	122 mm	75 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low
January	9.7 °C	7.7 °C	8.7 °C	13.9 °C	-0.9 °C
February	9.0 °C	7.1 °C	8.1 °C	14.1 °C	-3.4 °C
March	9.5 °C	7.8 °C	8.6 °C	13.4 °C	0.8 °C
April	10.5 °C	8.9 °C	9.6 °C	15.5 °C	3.5 °C
May	12.4 °C	10.9 °C	11.6 °C	17.9 °C	5.8 °C
June	14.5 °C	13.2 °C	13.8 °C	21.0 °C	9.4 °C
July	16.4 °C	15.2 °C	15.7 °C	22.9 °C	11.7 °C
August	17.3 °C	16.1 °C	16.7 °C	22.3 °C	12.0 °C
September	16.8 °C	15.4 °C	16.1 °C	21.6 °C	11.4 °C
October	15.2 °C	13.5 °C	14.3 °C	19.9 °C	6.5 °C
November	12.7 °C	10.8 °C	11.7 °C	17.5 °C	2.8 °C
December	10.7 °C	8.7 °C	9.7 °C	15.6 °C	0.5 °C

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	99 mm	15	8.6 h/day	75 %	78 %	45 km/h	10.4 °C
February	76 mm	13	10 h/day	71 %	78 %	42 km/h	9.5 °C
March	60 mm	11	12 h/day	67 %	80 %	38 km/h	9.2 °C
April	51 mm	9	14 h/day	59 %	81 %	34 km/h	9.9 °C
May	45 mm	8	15 h/day	60 %	84 %	32 km/h	11.5 °C
June	43 mm	8	16 h/day	57 %	86 %	30 km/h	13.6 °C
July	37 mm	7	16 h/day	54 %	87 %	29 km/h	15.6 °C
August	52 mm	9	14 h/day	57 %	85 %	30 km/h	16.9 °C
September	58 mm	9	13 h/day	59 %	80 %	34 km/h	17.0 °C
October	109 mm	15	11 h/day	69 %	78 %	40 km/h	15.9 °C
November	123 mm	17	9.1 h/day	73 %	77 %	43 km/h	14.1 °C
December	122 mm	17	8.2 h/day	75 %	78 %	45 km/h	12.0 °C

How Saint Peter Port compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Saint Peter Port	17 °C	7.1 °C	876 mm	0
Saint Helier · Jersey	19 °C	6.2 °C	995 mm	1
Bournemouth · United Kingdom	20 °C	4.0 °C	749 mm	4
Plymouth · United Kingdom	19 °C	4.4 °C	968 mm	1
Rennes · France	23 °C	2.8 °C	703 mm	26
Southampton · United Kingdom	21 °C	3.0 °C	738 mm	6
Portsmouth · United Kingdom	21 °C	3.3 °C	714 mm	6

Where Saint Peter Port ranks

Ranking	Position	Value
The coolest places in Europe in July	7th of 50	16 °C
The coolest places in Europe in June	9th of 50	15 °C
The coolest places in Europe in August	14th of 50	17 °C
The coolest places in Europe in May	19th of 50	12 °C
The coolest places in the world in May	27th of 50	12 °C
The coolest places in the world in June	42nd of 50	15 °C

Planning a trip? See the best time to visit Saint Peter Port.

QuestionsCommon questions about Saint Peter Port’s climate

When is the best time to visit Saint Peter Port?

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

How hot does Saint Peter Port get?

In August, the warmest month, daily highs average 17 °C. The highest value in the 1991–2020 record is 23 °C.

How cold does it get in winter?

Nights average 7.1 °C in February, the coldest month. A normal year has 0 nights below freezing.

Which month is wettest in Saint Peter Port?

November, averaging 123 mm over 17 days with rain. The driest month is July with 37 mm. The year as a whole averages 876 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 Saint Peter Port 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
Data point: 49.460°, -2.535° (the coordinates the reanalysis values are taken for)
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.