Due to the alignment of the sun, moon and earth, a super tide is set to hit for the first time in 18 years - with areas in the Wye estuary in Glocuestershire and Monmouthshire most at risk of flooding.
Meanwhile in Mersea Island, Essex, locals have already been dealing with floodwater as they tried to get around yesterday.
Flood warnings have also been issued for Norfolk, Lancashire, Wales, North Devon, Cornwall and Dorset - with more expected.
A spokesperson for the Environment Agency said: ‘Localised disruption to travel and some flooding of low-lying land and individual properties is possible.
'We urge people to take care near coastal paths and promenades and not to drive through flood water.
'The Environment Agency is monitoring the situation closely alongside the Met Office and will issue further flood updates and warnings if required.
'People should check their flood risk and keep up-to-date with the latest situation.'
The gravitational pull of the moon, and to a less extent, the sun, dictate the tides - and when the two are combined we get larger than average tides.
Anyone travelling during the next few days is advised to check weather reports before setting out.