Conditions at Dee Why have improved, with most seaweed clearing from the beach following a recent surge linked to large ocean swells along Sydney’s coast.
Recent Update At Dee Why
As of January 13, observations at Dee Why Beach indicate that nearly all seaweed has cleared from the shoreline. Swimming conditions were reported as favourable, with water temperatures at approximately 22°C.
The improvement follows several days where kelp had accumulated across sections of the beach, reducing usable sand and producing strong odours during hot weather.
What Led To The Seaweed Surge
The earlier build-up occurred after large swells over the New Year period dislodged offshore kelp beds. Seasonal growth through spring increased the amount of kelp available to be washed ashore once wave activity intensified.
Similar conditions were reported across multiple Sydney beaches during this period.
How Dee Why Responded
At Dee Why, the seaweed was left to break down and move naturally. Information published by Northern Beaches Council states that seaweed plays a role in sand recovery and supports coastal ecosystems.
Wave action and tides have since redistributed much of the kelp without mechanical removal.
Different Outcomes Elsewhere
Other Sydney beaches experienced different outcomes. In some locations, seaweed was removed where beach size or access was limited. These decisions varied depending on local conditions and volume.
Outlook
The latest conditions at Dee Why reflect a return to normal beach use following a short-term seaweed surge. Natural coastal processes have largely resolved the accumulation as ocean conditions stabilised.
Published 13-Jan-2026
