The Environmental Protection Department has rated water quality at 13 beaches 'good', 15 'fair', and five 'poor' for this weekend.

Compared with the grading released last week, Kiu Tsui Beach, Lo So Shing Beach, Lower Cheung Sha Beach, Middle Bay Beach, Pui O Beach and South Bay Beach were downgraded from 'good' to 'fair'; Butterfly Beach, Cafeteria Old Beach and Kadoorie Beach from 'fair' to 'poor'.

Seven gazetted beaches - Anglers' Beach, Approach Beach, Ting Kau Beach, Casam Beach, Gemini Beaches, Hoi Mei Wan Beach and Lido Beach - are closed to swimmers year round because of poor water quality.

Many beaches are likely to be more polluted than their grades suggest during and after periods of heavy rain. Bathers should avoid swimming at beaches for up to three days after a storm or heavy rainfall.

Click here to see the updates on beach water quality, or call the beach hotline, 2511 6666.