Thunderstorms have started to break out over eastern parts of Norfolk, Suffolk and Essex.
The Met Office has a yellow weather alert in force warning of torrential thundery downpours in places with the risk of surface water flooding. There's also the possibility of hail and strong gusts of wind.
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Mainly dry on Sunday in the Anglia region with some good sunny spells. One or two light showers are possible near coasts.
Britain has seen its driest first half of September since before the 1960s and it's also been rather warm.
East Anglia has experienced its hottest first eight months of the year since records started in 1910 despite a chilly August.