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 father of four from Birmingham says he is relieved to be back home after being arrested and detained in Portugal.
Tonight skies will remain fairly clear leading to a sharp frost forming even in city centres.
A cold night with clear spells and a few snow showers. These are likely to give a dusting, especially on hills.