Beachgoers across the Hunter region are being urged to exercise caution after councils detected patches of potentially irritating red algae along popular coastlines. The warning coincides with a severe heatwave set to blanket the area with extreme temperatures over the coming days.
Council Issues Official Alert for Swimmers
Lake Macquarie City Council formally issued a public alert on Thursday, January 8, 2026, following the identification of the algae species Noctiluca scintillans. The naturally occurring organism, often creating a "red tide," has been spotted at beaches including Blacksmiths and surrounding areas.
While the algae is not considered harmful to marine ecosystems, direct contact can lead to unpleasant reactions in people. Authorities have confirmed that swimmers may experience skin rashes and eye irritation if they enter affected waters.
The council's advice is clear: "If you notice red discolouration in the water, it's recommended to avoid swimming, surfing, or other water activities in those areas until the bloom subsides." The blooms are mobile and can shift location with changing winds and tidal movements.
Central Coast Reports Similar Blooms
The alert follows similar observations made by Central Coast Council, which first reported the reddish-pink patches at Shelly Beach, Toowoon Bay, Soldiers Beach, and Lakes Beach. The Central Coast warning also extended to pet owners, noting that while the algae is generally non-toxic, dogs could also be affected and should be kept out of the water.
An interesting side effect of this particular algae is its bioluminescent quality. At night, especially when the water is agitated, the blooms can produce a glowing effect—a spectacular but potentially irritating natural phenomenon.
Severe Heatwave Compounds Beach Concerns
The algae warning arrives as the Hunter region braces for a significant heatwave, forecast to run from Thursday, January 7, through to Saturday, January 10. The Bureau of Meteorology predicts punishing temperatures:
- Newcastle and Lake Macquarie: 34 degrees Celsius on Friday, soaring to 39 degrees on Saturday.
- Port Stephens: 33 degrees on Friday, rising to 38 degrees on Saturday, with potentially windy conditions.
- Inland Communities: The brunt of the heat will be felt west of the coast. Maitland, Cessnock, and Scone are likely to see the mercury hit 40 degrees on both Friday and Saturday, while Muswellbrook could endure a scorching 41 degrees.
The BOM has also issued a strong marine wind warning for the Hunter coast on Friday, adding another layer of caution for boaters and coastal activities.
This run of consecutive hot days is expected to accelerate the decomposition of large seaweed piles that washed up on Newcastle beaches earlier in the week, likely leading to increased odour. Overnight minimums will provide little respite, expected to remain in the high-teens.
Residents can look forward to a cool change arriving from Sunday, January 11. This shift is predicted to bring a medium chance of showers, most likely in the afternoon, and a potential for evening thunderstorms across both coastal and inland areas.
For now, the message from local authorities is to enjoy the beaches safely by staying informed, heeding the algae warnings, and taking necessary precautions against the extreme heat.
