Plymouth, United Kingdom Climate & Monthly Averages
Plymouth has an oceanic climate. July is the hottest month, averaging 67° by day; January is the coldest at 48°.
How weather changes through the year in Plymouth
Weather in Plymouth follows a oceanic pattern. The warmest and coolest months, July and January, average 67°F (20°C) and 48°F (9°C) by day; nights in those months run 57°F (14°C) and 40°F (4°C).
Plymouth climate quick facts
- Hottest month: July - highs near 67°F (20°C)
- Coldest month: January - highs near 48°F (9°C)
- Decade extremes (2015-2024): 87°F (31°C) high · 24°F (-5°C) low
- Wettest month: October (17 rainy days) · Sunniest: June (11.4 h sun/day)
- Climate type: oceanic
- Annual swing: 10°C between the average warmest and coolest month · day to night: 5°C
- Snow: about 1 days a year
- Average humidity: 81%
Temperatures, rain and sunshine
Warmth peaks in July: highs of 67°F (20°C), lows of 57°F (14°C). January sits at the other end of the year: 48°F (9°C) by day, 40°F (4°C) at night. Between the average July and the average January lie 10°C, a narrower spread than about 76% of the cities we track.
Days and nights are about 5°C apart on average - narrower than all but 3% of the 3496 cities in our dataset. Relative humidity averages 81% across the year, more humid than roughly 88% of the cities we track. October is the wettest month at 5.9 inches (149 mm) over 17 days; April is the driest. June is the brightest month at 11.4 hours of sun a day, against an annual average of 7.8 - duller than about 87% of the cities we track.
The gridded 2015-2024 daily record for this location tops out at 87°F (31°C) and bottoms at 24°F (-5°C) - decade extremes, not all-time station records.
Where Plymouth sits among other climates
- Plymouth sits close to the middle of our dataset on most measures: 53°F (12°C) as an annual average, 49.5 inches (1258 mm) of precipitation and 7.8 hours of sun a day.
These comparisons use the same ten-year window for every city in the dataset.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 48° | 40° | 14 | 4.1 in | 4.1 h/day | 8.5 h | 45% | 83% |
| February | 49° | 41° | 15 | 4.2 in | 5.4 h/day | 10.0 h | 52% | 82% |
| March | 51° | 42° | 16 | 4.7 in | 7.1 h/day | 11.7 h | 53% | 81% |
| April | 55° | 44° | 10 | 2.2 in | 10.2 h/day | 13.7 h | 33% | 77% |
| May | 60° | 49° | 13 | 3.0 in | 11.1 h/day | 15.4 h | 41% | 79% |
| June | 65° | 54° | 13 | 3.0 in | 11.4 h/day | 16.4 h | 44% | 79% |
| July | 67° | 57° | 13 | 3.3 in | 11.4 h/day | 16.0 h | 42% | 79% |
| August | 67° | 57° | 14 | 3.9 in | 10.1 h/day | 14.5 h | 47% | 82% |
| September | 64° | 55° | 13 | 4.0 in | 8.6 h/day | 12.5 h | 43% | 82% |
| October | 59° | 51° | 17 | 5.9 in | 6.6 h/day | 10.6 h | 54% | 84% |
| November | 53° | 46° | 16 | 5.4 in | 4.5 h/day | 8.9 h | 54% | 84% |
| December | 51° | 44° | 17 | 5.9 in | 3.6 h/day | 8.0 h | 56% | 85% |
Plymouth month by month
Each card shows the average high and low. The bar places that month between Plymouth's coldest night and warmest afternoon.
January
- Rain
- 14 days
- Sunshine
- 4.1 h
- Daylight
- 8.5 h
February
- Rain
- 15 days
- Sunshine
- 5.4 h
- Daylight
- 10.0 h
March
- Rain
- 16 days
- Sunshine
- 7.1 h
- Daylight
- 11.7 h
April
- Rain
- 10 days
- Sunshine
- 10.2 h
- Daylight
- 13.7 h
May
- Rain
- 13 days
- Sunshine
- 11.1 h
- Daylight
- 15.4 h
June
- Rain
- 13 days
- Sunshine
- 11.4 h
- Daylight
- 16.4 h
July
- Rain
- 13 days
- Sunshine
- 11.4 h
- Daylight
- 16.0 h
August
- Rain
- 14 days
- Sunshine
- 10.1 h
- Daylight
- 14.5 h
September
- Rain
- 13 days
- Sunshine
- 8.6 h
- Daylight
- 12.5 h
October
- Rain
- 17 days
- Sunshine
- 6.6 h
- Daylight
- 10.6 h
November
- Rain
- 16 days
- Sunshine
- 4.5 h
- Daylight
- 8.9 h
December
- Rain
- 17 days
- Sunshine
- 3.6 h
- Daylight
- 8.0 h
Looking for warmer alternatives? Browse warm places by month, or compare Plymouth's coolest part of the year: January, February, March.
A season-by-season guide to Plymouth
Spring (March through May)
Through spring, Plymouth runs cool rather than cold: 55°F (13°C) by day, 45°F (7°C) after dark, and rain falls on around 39 of the 90 days.
Summer (June through August)
Summer runs cool rather than cold here - highs near 66°F (19°C), nights near 56°F (13°C), and rain falls on around 41 of the 90 days. Daylight is generous - around 11.0 hours of sun a day.
Fall (September through November)
Fall stays on the cool side of mild here - highs near 59°F (15°C), nights near 51°F (10°C), and rain falls on around 46 of the 90 days.
Winter (December through February)
Winter is chilly here - highs near 49°F (10°C), nights near 42°F (6°C), and rain falls on around 46 of the 90 days.
Questions people ask about Plymouth's climate
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The most useful weather window for Plymouth
Best time to visit Plymouth
The best time to visit Plymouth is generally April to September, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window sit near 63°F (17°C), with rain on about 13 days a month. For the same question asked the other way round, see where else is warm in April.
What to pack
Pack for Plymouth with a warm jacket and layers for the cooler season and proper waterproofs rather than an umbrella - wet days are the norm here. Note the gap between afternoon and night: July pairs 67°F (20°C) with 57°F (14°C).
Plymouth temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.