Sydney was drenched by its heaviest rain in three months on Monday.

A low pressure trough near the central coast of NSW caused showers across the Sydney Basin on Monday.

The wet weather was stopping and starting early in the morning, before a band of heavier rain swept over some eastern and central suburbs shortly before lunchtime.

Image: Radar image showing a band of heavy rain passing over Sydney's eastern suburbs on Monday.

The city's Observatory Hill rain gauge received 26mm between 9am and 2pm, including 14mm of rain in 20 minutes. This was Sydney's highest daily total in three months. Other notable totals during the four hours to 2pm included 46mm at Manly and 37mm at Mosman.

Image: Sydney on Monday. Credit: Ben S / Instagram

Monday's soaking comes a day after some southern parts of the city picked up more than 40mm of rain from the same system. Audley's 60mm of rain during the 24 hours to 9am on Monday was their best rain in eight months.

The Bureau of Meteorology issued a road weather alert for Sydney's eastern suburbs on Monday, advising motorists to take 'extreme care' when driving where water had built up on roads.