Summer lasts from June to August and is the warmest season. Rainfall totals can have a wide local variation due to localized thunderstorms. These thunderstorms mainly occur in southern, eastern, and central England and are less frequent and severe in the north and west. North Atlantic depressions are not as severe in summer but increase both in severity and frequency towards the end of the season. Summer can see high pressure systems from the Azores High.
Climatic differences at this time of year are more influenced by latitude and temperatures are highest in southern and central areas and lowest in the north. Generally, summer temperatures rarely exceed 32 degrees, which happens more frequently in London and the South East than other parts of the country.
Scotland and northern England have the coolest summers (average 12.2 °C(54.0 °F) to 14.8 °C(58.6 °F)), while Wales and the south-west of England have warmer summers (14.9 °C(58.8 °F) to 15.4 °C(59.7 °F)) and the south and south-east of England have the warmest summers(15.5 °C(59.9 °F) to 17.7 °C(63.9 °F)).
Due to its proximity to the European land mass, the south-east usually experiences the highest temperatures in the summer.
So we have the UK averages for this summer above but what will really happen in a few months? We don't see a La Nina or El Nino forming through August but things could start to change in September.
The staff at liveweatherblogs.com forecasts above average temps for the summer with most of the warmest weather in July. We expect that month to be the warmest above average with an average of 22 during the day and 13 at night.
This would put the area about 1-2 degrees above normal for July. August will be wet and cooler than normal. Oh yeah June is right on track with temps right on average.
Rainfall will be about average for the entire summer with a few periods of heavy rain possibe in July.