This GEFS graph is showing a warm weekend then the temperature will fall away sharply next week.
The top of the graph is the temperature at 5,000 feet and the bottom of the graph is rainfall.
So you can see a rise in temperature from the 7th but come the 10th the temperature will fall away sharply. This will mean we can expect temperatures during the weekend in the low 20s. But come the 10th temperatures will be only around 16 c. It looks like the weekend should remain dry but from the 9th it will become showery. It looks like it will remain cool into the following weekend.
The main reason for the cooler temperatures will because of a mainly northerly wind directions.