Nearly 5cm of rain fell across the South East on Wednesday night (October 20), with some areas along the south coast experiencing flash flooding.
Littlehampton was among the worst affected areas, with flood water entering homes and businesses.
Fire crews worked into the night to pump excess water away, to try and protect homes and businesses.
Elsewhere in West Sussex, roads in East Grinstead were affected by flooding.
This footage was recorded on the B2110 Turners Hill Road as drivers, cyclists and pedestrians carefully made their way through the water.
Meanwhile, heavy rain caused major delays to South Western Railway services with passengers trapped on trains for more than an hour and a half as lines were blocked.
The lines from Waterloo to Salisbury and Portsmouth were among the worst affected.
Disruption is expected until 10am on Thursday (October 21) as work to clear the backlog of displaced trains continues.
Passengers are being urged to check before they travel.
Parts of Hampshire were affected too, with flooding reported on the M3 near Winchester as heavy rain overwhelmed the drainage system.
These are the pictures from Gosport, where water began to build as rain hit already saturated ground.