The Met Office has issued a yellow weather warning for the risk of heavy rain on Bank Holiday Monday.
The warning has now been extended to cover all of the Anglia region.
The Met Office Chief Forecaster says: "Rainfall amounts are likely to exceed 15 mm quite widely, while a few places could see more than 30 mm.."
The warning is valid from 6.00am on Monday 25 August 2014 until 11.50pm.
"Heavy rain will spread from the southwest on Bank Holiday Monday. A complex area of low pressure will bring an unpleasant day's weather to much of England and Wales on Monday. The public should be aware that there may be some impacts to holiday traffic and outdoor activities."
Cloudy and grey across the northwest, with mist and fog in places. Brighter conditions are likely in southern and eastern areas.
Cold and clear at times tonight with frost possible in the south. Northwestern parts will be cloudier with mist and fog patches developing.
It has been a chilly night in the Anglia region with temperatures plunging below -6°C at Writtle in Essex.