Climate averages 1991–2020
Plymouth weather
by month.
See how the year changes. July (tied with August) has the highest average daily maximum; May (tied with 3 other months) has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Plymouth averages a daytime high of 13.6°C and a nighttime low of 8.8°C, with about 947 mm of rain on roughly 149 days. July (tied with August) is the warmest month (average high 19.4°C) and January (tied with February) the coolest (8.7°C). November is the wettest month with 112 mm; May (tied with 3 other months) is the driest with 61 mm.
The annual picture
A year in Plymouth
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Plymouth climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.7°C4.9°C | 4.9°C | 102 | 15.5 | 8.69 h |
| February | 8.7°C4.4°C | 4.4°C | 77 | 12.0 | 10.010 h |
| March | 10.2°C5.2°C | 5.2°C | 67 | 11.9 | 11.812 h |
| April | 12.3°C6.5°C | 6.5°C | 63 | 11.5 | 13.814 h |
| May | 15.0°C9.2°C | 9.2°C | 61 | 10.7 | 15.415 h |
| June | 17.6°C11.9°C | 11.9°C | 61 | 10.6 | 16.316 h |
| July | 19.4°C13.9°C | 13.9°C | 61 | 10.5 | 16.016 h |
| August | 19.4°C14.1°C | 14.1°C | 69 | 11.2 | 14.515 h |
| September | 17.4°C12.5°C | 12.5°C | 61 | 10.3 | 12.713 h |
| October | 14.4°C10.3°C | 10.3°C | 104 | 14.5 | 10.811 h |
| November | 11.3°C7.6°C | 7.6°C | 112 | 15.4 | 9.19 h |
| December | 9.3°C5.6°C | 5.6°C | 109 | 15.1 | 8.18 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- ExeterUnited Kingdom · 59 kmHigh 13.6°C · Low 7.8°C · 766 mm rain a year
- Weston-super-MareUnited Kingdom · 136 kmHigh 13.7°C · Low 7.8°C · 802 mm rain a year
- SwanseaUnited Kingdom · 140 kmHigh 12.9°C · Low 8.3°C · 1,238 mm rain a year
- CardiffUnited Kingdom · 141 kmHigh 13.1°C · Low 7.7°C · 1,003 mm rain a year
- NewportUnited Kingdom · 157 kmHigh 13.7°C · Low 7.2°C · 849 mm rain a year
- PooleUnited Kingdom · 157 kmHigh 13.7°C · Low 9.0°C · 736 mm rain a year
- BristolUnited Kingdom · 162 kmHigh 13.7°C · Low 7.3°C · 773 mm rain a year
- BournemouthUnited Kingdom · 165 kmHigh 13.7°C · Low 8.9°C · 736 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC±0, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 50.40°, -4.10° (4 km from the city centre), adjusted up by 0.4°C for the difference between the city's elevation (14 m) and the cell's (76 m). Rain comes from the 0.25° cell at 50.25°, -4.25°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.