We are smoky and mostly sunny to finish the week, with tops of 26 on Thursday and 27 on Friday.
Saturday is warm and fairly sunny, with localised showers in the afternoon and evening. But this is not the main event, and it stays warm on Saturday night.
A big cold blast arrives early on Sunday morning, with temperatures starting to tumble around dawn. We should be in the low teens for much of the day on Sunday.
Rain is likely, with 15 to 30 mm - and its cold enough for wintry hail and thunder, and a proper blanket of snow in alpine areas (falling down to around 1100 metres).