Climate averages 1991–2020
Portsmouth weather
in June.
A mild, moderately wet month: the 3rd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a mild month in Portsmouth: daytime highs average 18.7°C and nights cool to about 11.8°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 51 mm of rain on roughly 9 days, which makes June a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 16 h 25 min on an average June day.
The nearest other city in this atlas is Southampton (25 km away). In June its highs average 18.6°C, about as warm as Portsmouth, with 54 mm of rain.
Among the 143 cities listed in the United Kingdom, Portsmouth ranks joint 35th of 143 for the warmest June highs and joint 6th of 143 for the driest June (rainfall, lowest first). The mean June high of those 143 cities is 17.9°C; Portsmouth is 0.8°C warmer than that mean.
From June to July, average highs rise by 2.1°C to 20.8°C, and monthly rainfall rises from 51 mm to 52 mm.
The annual picture
June in context
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
Portsmouth climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.9°C3.7°C | 3.7°C | 83 | 13.4 | 8.58 h |
| February | 8.1°C3.3°C | 3.3°C | 61 | 10.6 | 10.010 h |
| March | 10.3°C4.4°C | 4.4°C | 50 | 10.0 | 11.812 h |
| April | 12.9°C6.0°C | 6.0°C | 52 | 9.7 | 13.814 h |
| May | 16.0°C9.0°C | 9.0°C | 50 | 9.1 | 15.515 h |
| June, selected | 18.7°C11.8°C | 11.8°C | 51 | 9.4 | 16.416 h |
| July | 20.8°C14.0°C | 14.0°C | 52 | 9.6 | 16.016 h |
| August | 20.6°C14.1°C | 14.1°C | 64 | 9.9 | 14.515 h |
| September | 18.3°C12.2°C | 12.2°C | 62 | 10.2 | 12.713 h |
| October | 14.7°C9.7°C | 9.7°C | 96 | 13.4 | 10.811 h |
| November | 11.0°C6.5°C | 6.5°C | 99 | 13.8 | 9.09 h |
| December | 8.4°C4.3°C | 4.3°C | 92 | 13.4 | 8.08 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
June in nearby cities
- Southampton in JuneUnited Kingdom · 25 kmHigh 18.6°C · Low 11.7°C · 54 mm rain
- Worthing in JuneUnited Kingdom · 50 kmHigh 17.7°C · Low 12.0°C · 49 mm rain
- Basingstoke in JuneUnited Kingdom · 52 kmHigh 18.8°C · Low 10.8°C · 57 mm rain
- Bournemouth in JuneUnited Kingdom · 56 kmHigh 18.1°C · Low 12.3°C · 51 mm rain
- Guildford in JuneUnited Kingdom · 61 kmHigh 19.3°C · Low 11.1°C · 57 mm rain
- Poole in JuneUnited Kingdom · 64 kmHigh 18.0°C · Low 12.3°C · 51 mm rain
- Hove in JuneUnited Kingdom · 65 kmHigh 17.5°C · Low 11.9°C · 47 mm rain
- Brighton in JuneUnited Kingdom · 67 kmHigh 17.5°C · Low 11.9°C · 47 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Portsmouth) is explained once on the Portsmouth year overview and on the Sources, method and limits page.