Byron Bay Water Temperature
Updated Tue 14:54 (Australia/Brisbane)
Australia · Forecast updated Sep 22, 2026, 14:54 UTC
Current Sea Temperature
21.4°C
70.5°F
Cool water
Valid Sep 22, 2026, 14:54 (Australia/Brisbane). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.3°C above
The typical September average is 21.1°C (70.0°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 21.0°C, versus 20.9°C in the prior seven days.
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 or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Byron Bay, typical monthly averages range from about 20.4°C (68.7°F) in July to 25.9°C (78.6°F) in March.
Over the past 30 days, the average sea temperature in Byron Bay has been 20.8°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Byron Bay, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 25.0–25.8°C | 25.5°C / 77.9°F |
| February | 25.4–26.3°C | 25.8°C / 78.4°F |
| March | 25.4–26.1°C | 25.9°C / 78.6°F |
| April | 24.6–24.9°C | 24.8°C / 76.6°F |
| May | 22.2–23.2°C | 22.9°C / 73.2°F |
| June | 20.9–21.7°C | 21.4°C / 70.5°F |
| July | 20.2–20.7°C | 20.4°C / 68.7°F |
| August | 20.3–20.6°C | 20.4°C / 68.7°F |
| September | 20.9–21.3°C | 21.1°C / 70.0°F |
| October | 21.8–22.3°C | 22.0°C / 71.6°F |
| November | 21.0–23.1°C | 22.2°C / 72.0°F |
| December | 22.9–24.3°C | 23.5°C / 74.3°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-28.54, 153.71). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Water temperature by month
Each month uses the 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Byron Bay in January
Typical January water temperature near Byron Bay is 25.5°C (77.9°F), with yearly monthly means from 25.0–25.8°C.
Byron Bay in February
Typical February water temperature near Byron Bay is 25.8°C (78.4°F), with yearly monthly means from 25.4–26.3°C.
Byron Bay in March
Typical March water temperature near Byron Bay is 25.9°C (78.6°F), with yearly monthly means from 25.4–26.1°C.
Byron Bay in April
Typical April water temperature near Byron Bay is 24.8°C (76.6°F), with yearly monthly means from 24.6–24.9°C.
Byron Bay in May
Typical May water temperature near Byron Bay is 22.9°C (73.2°F), with yearly monthly means from 22.2–23.2°C.
Byron Bay in June
Typical June water temperature near Byron Bay is 21.4°C (70.5°F), with yearly monthly means from 20.9–21.7°C.
Byron Bay in July
Typical July water temperature near Byron Bay is 20.4°C (68.7°F), with yearly monthly means from 20.2–20.7°C.
Byron Bay in August
Typical August water temperature near Byron Bay is 20.4°C (68.7°F), with yearly monthly means from 20.3–20.6°C.
Byron Bay in September
Typical September water temperature near Byron Bay is 21.1°C (70.0°F), with yearly monthly means from 20.9–21.3°C.
Byron Bay in October
Typical October water temperature near Byron Bay is 22.0°C (71.6°F), with yearly monthly means from 21.8–22.3°C.
Byron Bay in November
Typical November water temperature near Byron Bay is 22.2°C (72.0°F), with yearly monthly means from 21.0–23.1°C.
Byron Bay in December
Typical December water temperature near Byron Bay is 23.5°C (74.3°F), with yearly monthly means from 22.9–24.3°C.
Forecast archive (growing)
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 20.6°C / 69.1°F | 21.4°C / 70.6°F | 22.2°C / 72.0°F |
| July | 19.4°C / 66.9°F | 20.1°C / 68.1°F | 21.0°C / 69.8°F |
| August | 19.7°C / 67.5°F | 20.2°C / 68.4°F | 20.6°C / 69.1°F |
| September | 20.4°C / 68.7°F | 21.0°C / 69.8°F | 21.6°C / 70.9°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2735 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Byron Bay
Julian Rocks reserve with turtles, rays and grey nurse sharks in clear water.
- Area
- New South Wales
Byron Bay Water Temperature: Common Questions
What is the water temperature in Byron Bay today?
The current sea surface temperature near Byron Bay is 21.4°C (70.5°F). Over the last 30 days, the average has been 20.8°C.
When is the water warmest in Byron Bay?
The water is typically warmest in March, at around 25.9°C (78.6°F) in the 2023–2025 historical baseline.
When is the water coldest in Byron Bay?
The water is typically coldest in July, at around 20.4°C (68.7°F) in the same historical baseline.
Can you swim in Byron Bay today?
At 21.4°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Byron Bay.
View Snorkel Forecast →