Plymouth climate

Name: Plymouth
Address: MS

Plymouth is warmest in August, with average highs of 29 °C, and coldest in February, when nights average 24 °C. October is the wettest month (119 mm) and March the driest (23 mm). Figures are 1991–2020 climate normals.

Across a full year Plymouth averages 775 mm of rain and 361 days above 25 °C.

Montserrat · 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 29 °C
Coldest month February 24 °C
Driest month March 23 mm
Wettest month October 119 mm
Least cloud January 30 % cloud
Hottest on record October 31 °C
Coldest on record February 21 °C
Warmest sea September 29 °C

What to expectPlymouth through the year

Plymouth changes little through the year. Average daily highs stay between 26 and 29 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 361 days a year reach 25 °C, 5 of them reach 30 °C. The warmest reading in the 1991–2020 record is 31 °C, in October.

Rain is strongly seasonal. October averages 119 mm against 23 mm in March — 5.1 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Plymouth is warmest in September at 29 °C and coldest in February at 26 °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	26.3 °C	37 mm	30 %
February	26.3 °C	24 mm	30 %
March	26.6 °C	23 mm	33 %
April	27.2 °C	33 mm	38 %
May	27.9 °C	58 mm	54 %
June	28.6 °C	46 mm	54 %
July	28.6 °C	71 mm	47 %
August	28.8 °C	89 mm	49 %
September	28.7 °C	112 mm	59 %
October	28.3 °C	119 mm	55 %
November	27.6 °C	100 mm	45 %
December	26.8 °C	62 mm	36 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	26.3 °C	23.8 °C	25.0 °C	28.5 °C	20.9 °C	30	0
February	26.3 °C	23.6 °C	24.8 °C	28.6 °C	20.8 °C	27	0
March	26.6 °C	23.7 °C	25.0 °C	29.0 °C	21.6 °C	30	0
April	27.2 °C	24.3 °C	25.6 °C	29.8 °C	21.7 °C	30	0
May	27.9 °C	25.1 °C	26.4 °C	30.2 °C	22.6 °C	31	0
June	28.6 °C	25.7 °C	27.0 °C	30.6 °C	23.7 °C	30	0
July	28.6 °C	25.7 °C	27.1 °C	30.9 °C	23.8 °C	31	1
August	28.8 °C	26.0 °C	27.3 °C	30.9 °C	24.4 °C	31	1
September	28.7 °C	25.9 °C	27.3 °C	31.0 °C	23.9 °C	30	1
October	28.3 °C	25.7 °C	27.0 °C	31.3 °C	23.7 °C	31	1
November	27.6 °C	25.1 °C	26.3 °C	29.9 °C	22.3 °C	30	0
December	26.8 °C	24.4 °C	25.5 °C	29.9 °C	21.8 °C	30	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	37 mm	12	11 h/day	30 %	74 %	32 km/h	26.7 °C
February	24 mm	8	12 h/day	30 %	73 %	32 km/h	26.4 °C
March	23 mm	8	12 h/day	33 %	72 %	30 km/h	26.4 °C
April	33 mm	9	13 h/day	38 %	74 %	29 km/h	27.0 °C
May	58 mm	11	13 h/day	54 %	76 %	29 km/h	27.6 °C
June	46 mm	11	13 h/day	54 %	76 %	32 km/h	27.9 °C
July	71 mm	15	13 h/day	47 %	78 %	33 km/h	28.1 °C
August	89 mm	17	13 h/day	49 %	78 %	31 km/h	28.6 °C
September	112 mm	17	12 h/day	59 %	79 %	27 km/h	28.9 °C
October	119 mm	18	12 h/day	55 %	79 %	27 km/h	28.9 °C
November	100 mm	16	11 h/day	45 %	78 %	28 km/h	28.4 °C
December	62 mm	15	11 h/day	36 %	75 %	31 km/h	27.5 °C

How Plymouth 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
Plymouth	29 °C	24 °C	775 mm	361
Saint John’s · Antigua and Barbuda	29 °C	24 °C	837 mm	361
Basseterre · Saint Kitts and Nevis	29 °C	24 °C	807 mm	357
Basse-Terre · Guadeloupe	30 °C	24 °C	816 mm	364
Gustavia · Saint Barthelemy	28 °C	24 °C	757 mm	342
Roseau · Dominica	28 °C	24 °C	818 mm	359
Fort-de-France · Martinique	29 °C	24 °C	1,000 mm	365

Planning a trip? See the best time to visit Plymouth.

QuestionsCommon questions about Plymouth’s climate

When is the best time to visit Plymouth?

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

How hot does Plymouth get?

In August, the warmest month, daily highs average 29 °C. About 5 days a year pass 30 °C. The highest value in the 1991–2020 record is 31 °C.

How cold does it get in winter?

Nights average 24 °C in February, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Plymouth?

October, averaging 119 mm over 18 days with rain. The driest month is March with 23 mm. The year as a whole averages 775 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 Plymouth 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: 16.706°, -62.213° (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.