There are warnings for people to avoid swimming in lakes, rivers and other open water.
It follows the death of 17-year-old Russell O'Neill who lost his life over the weekend, swimming in a quarry near the Malvern Hills in Worcestershire.
Charlotte Grant reports.
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A cloudy or misty start to the weekend, although mainly dry with sunny spells developing. Low cloud may linger in some spots.
A largely cloudy start to the weekend but mostly dry start. Through the day, some sunny spells are likely to develop.
The mother of a boy who was murdered 20 years ago today has demanded that the Police re-open the investigation into his death.