After a few days of glorious sunshine, Hertfordshrie residents can expect a wet one tonight.
Weather experts from the Met Office are predicting thundery showers will spread to many parts after dark, with possible hail and thunder. Southern parts will start to clear by dawn.
However the temperature will stay reasonably warm.
The thundery rain will head north over Saturday, meaning a dry afternoon with some sunshine.
There will be some rain on Sunday but then becoming dry and sunny into next week.