The Met Office has warned of heavy, thundery showers moving across much of the country today.
It has issued a yellow ‘be aware’ warning which is in place until midnight.
It said where the showers are at their heaviest there could be surface water flooding and minor travel disruption.
The Met Office’s chief forecaster said: “A slack area of low pressure will move slowly across southern Britain today, bringing unstable air and the potential for thundery showers.
“The light winds mean that the downpours will be slow-moving as well as intense in some regions, with the possibility of 15mm or more falling in less than an hour, leading to temporary surface water flooding in a few areas, together with minor disruption to travel.”
A warning is also in place for Wednesday, with further slow-moving bands of heavy rain likely to continue. The Met Office said it will be a minority of places which see the larger downpours, but where it occurs, there is the risk of localised minor flooding.
Upwards of 30mm could fall in a few places, but conditions are expected to ease during the afternoon.