Climate averages 1991–2020
Southampton weather
in June.
A mild, moderately wet month: the 3rd warmest and the joint 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a mild month in Southampton: daytime highs average 18.6°C and nights cool to about 11.7°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 54 mm of rain on roughly 10 days, which makes June a moderately wet month (the joint 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 16 h 26 min on an average June day.
The nearest other city in this atlas is Portsmouth (25 km away). In June its highs average 18.7°C, about as warm as Southampton, with 51 mm of rain.
Among the 143 cities listed in the United Kingdom, Southampton ranks joint 43rd of 143 for the warmest June highs and joint 18th of 143 for the driest June (rainfall, lowest first). The mean June high of those 143 cities is 17.9°C; Southampton is 0.7°C warmer than that mean.
From June to July, average highs rise by 2.0°C to 20.7°C, and monthly rainfall falls from 54 mm to 53 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
Southampton climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.8°C3.5°C | 3.5°C | 67 | 11.5 | 8.58 h |
| February | 8.0°C3.2°C | 3.2°C | 51 | 10.2 | 10.010 h |
| March | 10.2°C4.3°C | 4.3°C | 48 | 10.1 | 11.812 h |
| April | 12.8°C5.9°C | 5.9°C | 56 | 11.1 | 13.814 h |
| May | 15.9°C8.8°C | 8.8°C | 57 | 10.0 | 15.515 h |
| June, selected | 18.6°C11.7°C | 11.7°C | 54 | 10.0 | 16.416 h |
| July | 20.7°C13.8°C | 13.8°C | 53 | 10.0 | 16.016 h |
| August | 20.4°C13.9°C | 13.9°C | 65 | 10.4 | 14.615 h |
| September | 18.1°C12.0°C | 12.0°C | 54 | 9.3 | 12.713 h |
| October | 14.5°C9.6°C | 9.6°C | 75 | 11.6 | 10.811 h |
| November | 10.8°C6.4°C | 6.4°C | 75 | 11.7 | 9.09 h |
| December | 8.3°C4.2°C | 4.2°C | 71 | 11.4 | 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
- Portsmouth in JuneUnited Kingdom · 25 kmHigh 18.7°C · Low 11.8°C · 51 mm rain
- Bournemouth in JuneUnited Kingdom · 39 kmHigh 18.1°C · Low 12.3°C · 51 mm rain
- Basingstoke in JuneUnited Kingdom · 46 kmHigh 18.8°C · Low 10.8°C · 57 mm rain
- Poole in JuneUnited Kingdom · 46 kmHigh 18.0°C · Low 12.3°C · 51 mm rain
- Reading in JuneUnited Kingdom · 68 kmHigh 19.1°C · Low 11.0°C · 54 mm rain
- Guildford in JuneUnited Kingdom · 69 kmHigh 19.3°C · Low 11.1°C · 57 mm rain
- Bracknell in JuneUnited Kingdom · 73 kmHigh 19.1°C · Low 10.8°C · 55 mm rain
- Worthing in JuneUnited Kingdom · 73 kmHigh 17.7°C · Low 12.0°C · 49 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 Southampton) is explained once on the Southampton year overview and on the Sources, method and limits page.