There is only one thing certain about Sheffield's weather heading into the weekend - the uncertainty.
A yellow Met Office 'be aware' warning for thunderstorms remains in place until 2am on Saturday.
Friday evening will be humid with outbreaks of heavy, thundery rain, locally torrential.
The minimum temperature overnight will be 17 °C.
Saturday will be mainly dry at first, occasionally sunny, then a band of showers will arrive later in morning.
It is expected to become sunnier early afternoon, but with fresh breezes and further showers, possibly thundery.
The highest temperature will be 22 °C.