The Met Office has issued a severe weather warning with rain set to batter Britain today.
It has issued two yellow alerts for rain in Scotland and Northern Ireland, and areas with high chances of flooding and heavy showers.
Coastal areas are going to be hit by strong winds, with gusts of up to 50mph.
Regions at risk are expected to accumulate 20-30mm of rainfall, with temperatures set to drop to 9C.
Homes and businesses could be flooded, and bus and train services could be hit with delays.
Today will bring wet and windy conditions across northern and western areas of the UK.
Most southern and eastern parts of the country will stay dry, but a band of rain is expected to move slowly eastwards.
Heavy showers are expected tonight further north and west.
Sunday will bring heavy rain in the north, with hail and thunder set to strike Scotland.
Met Office Meteorologist Aidan McGivern said: “Rainfall sticks around for the far north of Scotland.
“Across the far west of Scotland, Northern Ireland, parts of England as well as Wales, showers follow the main area of rainfall.
“The showers are accompanied by a blustery wind and it will feel cool as the rain clears.
“But ahead of the front, east Anglia and the southeast will see temperatures up into the mid-20s again.”
Temperatures will peak at 24C in southern and eastern parts of the UK.
The forecast for the second half of September is optimistic, with “higher than average” temperatures predicted.