A weather warning has been issued by the Met Office, which has forecast heavy rain and storms for this afternoon and evening.
It says heavy showers and thunderstorms are expected to develop this afternoon and persist into the night.
There is a risk of surface water flooding and lightning in some areas.
Up to an inch of fain could fall in two hours in some areas.
Examiner weatherman Paul Hudson tweeted: "This afternoon the odd (shower) will be heavy and thundery and a cool 17c."