Port Stephens Sea Temperature
Updated Wed 11:46 (Australia/Brisbane)
Australia · Forecast updated Aug 12, 2026, 11:46 UTC
Current Sea Temperature
18.5°C
65.3°F
Cool water
Versus this month's average
Close to average
The August average in our archive is 18.5°C (65.2°F).
Recent trend
At least two weeks of records are needed before showing a reliable trend.
What to wear
Cool water
A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions.
Sea Surface Temperature Over the Year
In the data collected for Port Stephens, monthly averages range from about 18.5°C (65.2°F) in August to 18.5°C (65.2°F) in August.
Over the past 30 days, the average sea temperature in Port Stephens has been 18.5°C.
Monthly Water Temperature Averages
Southern Hemisphere. Summer is generally December–February; winter is June–August.
| Month | Min | Average | Max |
|---|---|---|---|
| August | 18.4°C / 65.1°F | 18.5°C / 65.2°F | 18.5°C / 65.3°F |
Profile calculated from 92 hourly forecast records across 1 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Port Stephens
Sheltered estuary and marine park with clear coves, seagrass and resident turtles.
- Area
- New South Wales
Port Stephens Water Temperature: Common Questions
What is the sea temperature in Port Stephens today?
The current sea surface temperature in Port Stephens is 18.5°C. Over the last 30 days, the average has been 18.5°C.
When is the water warmest in Port Stephens?
The warmest monthly average in the Port Stephens archive is August, at around 18.5°C (65.2°F).
When is the water coldest in Port Stephens?
The coldest monthly average in the archive is August, at around 18.5°C (65.2°F). A wetsuit is usually recommended during this period.
Can you swim in Port Stephens today?
The water is 18.5°C. It may feel cool, but a wetsuit or short swims can help.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Port Stephens.
View Snorkel Forecast →