It is usually around the time of the Grand Prix extreme weather in Hungary. When it is hot it is really hot. When it rains, it rains a lot and it rains hard. For this weekend the first scenario seems the most realistic, but a mix of both is not excluded.
For now, it looks like Friday will be sunny at least. With temperatures of 30 degrees and more, it will be very warm at the start of the race weekend. The teams will have plenty of time to prepare and collect data.
The temperature will also be around or above 30 degrees during qualifying and the race. However, on Saturday and especially on Sunday there is a greater chance of showers. According to the latest reports, there is a good chance of heavy showers over Central Europe on Sunday afternoon, during the race.
Friday will be sunny, Saturday seems to be warm and sultry and Sunday is warm with a greater chance of showers. A rain race is certainly not excluded on Sunday.