Summer is certainly not over. But it is certain to be very very short, if at all.
To have a feel of a decent summer, we need to have settled warm weather in May, preferably with a sprinkling of hot days (personally, I use the measure of hot days in May as an omen for the rest of the summer)
You definitely need those conditions in June.
Both of those are missing this year.
Augusts appears to have lost it's ability to settle for the most part, decades ago.
What is the probability of having anything near 4 weeks of settled weather in July?
This is also not a 'summer is over' post, but it is a realistic proposal that this summer is in all probability going to be very short and recorded as poor and below average.
Located in West London
"Everything in life is our fault, but that's not our fault!"
Anonymous friend of Quentin Crisp