Plymouth weather in July
In July, Plymouth has daytime highs averaging 29 °C, nights around 26 °C, with 15 wet days, and a sea temperature of 28 °C. Figures are 1991–2020 climate normals.
- 28.6°C Average high
- 25.7°C Average low
- 15days Wet days
- 71mm Rainfall
- 28.1°C Sea temperature
- 13h Daylight
Daily temperatures through July
How July develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 July | 28.6 °C | 25.7 °C | 46 % |
| 11–20 July | 28.6 °C | 25.7 °C | 48 % |
| 21–31 July | 28.7 °C | 25.8 °C | 50 % |
What to expect
| Measure | Typical July | Share of the month |
|---|---|---|
| Days above 25 °C | 31 of 31 | 100 % |
| Days above 30 °C | 0.9 of 31 | 3 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 15 of 31 | 49 % |
Conditions in July
| Measure | Average |
|---|---|
| Mean temperature | 27 °C |
| Record high (1991–2020) | 31 °C |
| Record low (1991–2020) | 24 °C |
| Relative humidity | 78 % |
| Wind speed | 33 km/h |
| Cloud cover | 47 % |
July compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| 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 % |
See all twelve months for Plymouth
- July is the 3rd warmest month here.
- It is the 8th driest month of the year.
- It ranks 7th for least cloud cover.
- Days last about 13 hours from sunrise to sunset.
- It rains on 15 of 31 days — 49 % of the month.
- Nights are about 2.9 °C cooler than the middle of the day.
- The hottest July day on record since 1991 reached 31 °C, 2.3 °C above the usual daytime high.
- Beach score: 72 / 100 — see how this is calculated.
QuestionsJuly in Plymouth, answered
How warm is Plymouth in July?
Daily highs average 29 °C and nights fall to about 26 °C, a spread of 2.9 °C between afternoon and dawn. That makes July the 3rd warmest month of the year here.
Does it rain much in Plymouth in July?
July averages 71 mm of rain, spread over about 15 of the 31 days — 49 % of the month. Cloud cover averages 47 % of the sky.
Is the sea warm enough to swim in July?
The sea averages 28 °C off Plymouth in July. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in July?
Plymouth averages 13 hours between sunrise and sunset in July. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
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
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. 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.