INSTRUMENT / SEA TEMPERATURE
Byron Bay Water Temperature
Updated Fri 20:17 (Australia/Brisbane)
Australia · Forecast updated Nov 6, 2026, 20:17 UTC
Current Sea Temperature
20.6°C
69.1°F
Cool water
Valid Nov 6, 2026, 20:17 (Australia/Brisbane). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
1.6°C below
The typical November average is 22.2°C (72.0°F) from the historical baseline.
Recent trend
Warming by 0.4°C
Seven-day average: 22.1°C, versus 21.7°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 21.7°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 2022–2025. 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 | 23.6°C / 74.5°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 2022–2025 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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: December 23.6°C · February 25.8°C.
Explore Byron Bay sea temperature in January, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: January 25.5°C · March 25.9°C.
Explore Byron Bay sea temperature in February, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: February 25.8°C · April 24.8°C.
Explore Byron Bay sea temperature in March, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: March 25.9°C · May 22.9°C.
Explore Byron Bay sea temperature in April, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: April 24.8°C · June 21.4°C.
Explore Byron Bay sea temperature in May, including swim comfort and month comparisons →
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.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: May 22.9°C · July 20.4°C.
Explore Byron Bay sea temperature in June, including swim comfort and month comparisons →
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.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: June 21.4°C · August 20.4°C.
Explore Byron Bay sea temperature in July, including swim comfort and month comparisons →
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.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: July 20.4°C · September 21.1°C.
Explore Byron Bay sea temperature in August, including swim comfort and month comparisons →
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.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: August 20.4°C · October 22.0°C.
Explore Byron Bay sea temperature in September, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: September 21.1°C · November 22.2°C.
Explore Byron Bay sea temperature in October, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: October 22.0°C · December 23.6°C.
Explore Byron Bay sea temperature in November, including swim comfort and month comparisons →
Byron Bay in December
Typical December water temperature near Byron Bay is 23.6°C (74.5°F), with yearly monthly means from 22.9–24.3°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: November 22.2°C · January 25.5°C.
Explore Byron Bay sea temperature in December, including swim comfort and month comparisons →
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 | 21.1°C / 70.0°F | 22.0°C / 71.6°F |
| October | 21.0°C / 69.8°F | 21.7°C / 71.0°F | 22.3°C / 72.1°F |
| November | 21.0°C / 69.8°F | 21.8°C / 71.3°F | 22.5°C / 72.5°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3821 hourly forecast records across 6 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 20.6°C (69.1°F). Over the last 30 days, the average has been 21.7°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 2022–2025 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 20.6°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 →