If you need to be out with a young baby in these temps it's not necessarily easy.
In certain directions sun shines in the bassinet regardless of having the (large) hood up. Below 6 months, babies can't use suncream, so keeping them out of the sun is important. You have to balance the sun risk with the heat risk.
I mocked up a crappy solution that could extend the reach of the hood with a muslin cloth, but still had large gaps at the sides to maintain airflow, but not easy when you're out and about.
I think the scorn from pp on this thread isn't helpful. Very few people are using wool blankets over the pram, it's things like muslins that seem very thin, so people don't consider them holding heat in the same way