Southampton weather in July
Temperature, sea and sunshine in July: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in July
Excellent
Best time to visit: May – September
What is the weather like in Southampton in July?
In July, Southampton is mild: daytime highs average 21 °C, and nights cool down to about 14 °C. The sea averages 16.7 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. Rain is frequent, with about 10 rainy days and 58 mm in total. All in all, July is an excellent month for a holiday in Southampton.
July compared
How the weather changes from June to August. Tap a month to open it.
More details for July
- Daylight
- 16 h 7 min05:08 – 21:15
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 23 km/haverage daily peakAll months
- Cloud cover
- 59 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1Europe/London
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %78 %
- Few rainy daysweight 30 %56 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in July
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Southampton in July: quick answers
Is Southampton hot in July?
No. In July, Southampton is mild: daytime highs average 21 °C and nights drop to about 14 °C.
Can you swim in Southampton in July?
Only if you don't mind cold water: in July the sea averages just 16.7 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Southampton in July?
Rain is frequent, with about 10 rainy days and 58 mm in total.
Southampton month by month
The whole year in SouthamptonAll destinations: United KingdomWhere to go in JulySea temperature in July
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences