INSTRUMENT / SEA TEMPERATURE
Heron Island Water Temperature
Updated Sat 14:59 (Australia/Brisbane)
Australia · Forecast updated Nov 7, 2026, 14:59 UTC
Current Sea Temperature
26.0°C
78.8°F
Warm water
Valid Nov 7, 2026, 14:59 (Australia/Brisbane). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
Close to average
The typical November average is 25.8°C (78.4°F) from the historical baseline.
Recent trend
Warming by 0.6°C
Seven-day average: 25.2°C, versus 24.6°C in the prior seven days.
What to wear
Warm water
Most people are comfortable in swimwear or a light rash guard.
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 Heron Island, typical monthly averages range from about 21.1°C (70.0°F) in July to 28.0°C (82.4°F) in February.
Over the past 30 days, the average sea temperature in Heron Island has been 24.3°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Heron Island, calculated from hourly observations for 2022–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 26.6–28.9°C | 27.9°C / 82.2°F |
| February | 27.5–28.5°C | 28.0°C / 82.4°F |
| March | 27.3–27.8°C | 27.5°C / 81.5°F |
| April | 25.9–26.3°C | 26.1°C / 79.0°F |
| May | 23.4–24.0°C | 23.7°C / 74.7°F |
| June | 22.0–22.3°C | 22.2°C / 72.0°F |
| July | 21.0–21.4°C | 21.1°C / 70.0°F |
| August | 21.3–21.9°C | 21.6°C / 70.9°F |
| September | 22.3–22.5°C | 22.4°C / 72.3°F |
| October | 23.4–24.7°C | 24.1°C / 75.4°F |
| November | 24.8–26.5°C | 25.8°C / 78.4°F |
| December | 25.7–27.5°C | 26.9°C / 80.4°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-23.46, 151.88). 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.
Heron Island in January
Typical January water temperature near Heron Island is 27.9°C (82.2°F), with yearly monthly means from 26.6–28.9°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: December 26.9°C · February 28.0°C.
Explore Heron Island sea temperature in January, including swim comfort and month comparisons →
Heron Island in February
Typical February water temperature near Heron Island is 28.0°C (82.4°F), with yearly monthly means from 27.5–28.5°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: January 27.9°C · March 27.5°C.
Explore Heron Island sea temperature in February, including swim comfort and month comparisons →
Heron Island in March
Typical March water temperature near Heron Island is 27.5°C (81.5°F), with yearly monthly means from 27.3–27.8°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: February 28.0°C · April 26.1°C.
Explore Heron Island sea temperature in March, including swim comfort and month comparisons →
Heron Island in April
Typical April water temperature near Heron Island is 26.1°C (79.0°F), with yearly monthly means from 25.9–26.3°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: March 27.5°C · May 23.7°C.
Explore Heron Island sea temperature in April, including swim comfort and month comparisons →
Heron Island in May
Typical May water temperature near Heron Island is 23.7°C (74.7°F), with yearly monthly means from 23.4–24.0°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: April 26.1°C · June 22.2°C.
Explore Heron Island sea temperature in May, including swim comfort and month comparisons →
Heron Island in June
Typical June water temperature near Heron Island is 22.2°C (72.0°F), with yearly monthly means from 22.0–22.3°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: May 23.7°C · July 21.1°C.
Explore Heron Island sea temperature in June, including swim comfort and month comparisons →
Heron Island in July
Typical July water temperature near Heron Island is 21.1°C (70.0°F), with yearly monthly means from 21.0–21.4°C.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: June 22.2°C · August 21.6°C.
Explore Heron Island sea temperature in July, including swim comfort and month comparisons →
Heron Island in August
Typical August water temperature near Heron Island is 21.6°C (70.9°F), with yearly monthly means from 21.3–21.9°C.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: July 21.1°C · September 22.4°C.
Explore Heron Island sea temperature in August, including swim comfort and month comparisons →
Heron Island in September
Typical September water temperature near Heron Island is 22.4°C (72.3°F), with yearly monthly means from 22.3–22.5°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: August 21.6°C · October 24.1°C.
Explore Heron Island sea temperature in September, including swim comfort and month comparisons →
Heron Island in October
Typical October water temperature near Heron Island is 24.1°C (75.4°F), with yearly monthly means from 23.4–24.7°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: September 22.4°C · November 25.8°C.
Explore Heron Island sea temperature in October, including swim comfort and month comparisons →
Heron Island in November
Typical November water temperature near Heron Island is 25.8°C (78.4°F), with yearly monthly means from 24.8–26.5°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: October 24.1°C · December 26.9°C.
Explore Heron Island sea temperature in November, including swim comfort and month comparisons →
Heron Island in December
Typical December water temperature near Heron Island is 26.9°C (80.4°F), with yearly monthly means from 25.7–27.5°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: November 25.8°C · January 27.9°C.
Explore Heron Island 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 | 21.0°C / 69.8°F | 22.2°C / 71.9°F | 23.2°C / 73.8°F |
| July | 20.2°C / 68.4°F | 21.0°C / 69.8°F | 22.4°C / 72.3°F |
| August | 20.3°C / 68.5°F | 21.0°C / 69.8°F | 22.3°C / 72.1°F |
| September | 20.9°C / 69.6°F | 22.1°C / 71.8°F | 23.2°C / 73.8°F |
| October | 22.0°C / 71.6°F | 23.7°C / 74.6°F | 25.3°C / 77.5°F |
| November | 24.6°C / 76.3°F | 25.5°C / 77.9°F | 26.5°C / 79.7°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3839 hourly forecast records across 6 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Heron Island
Coral cay sitting right on the Great Barrier Reef with reef accessible from the beach.
- Area
- Queensland
Heron Island Water Temperature: Common Questions
What is the water temperature in Heron Island today?
The current sea surface temperature near Heron Island is 26.0°C (78.8°F). Over the last 30 days, the average has been 24.3°C.
When is the water warmest in Heron Island?
The water is typically warmest in February, at around 28.0°C (82.4°F) in the 2022–2025 historical baseline.
When is the water coldest in Heron Island?
The water is typically coldest in July, at around 21.1°C (70.0°F) in the same historical baseline.
Can you swim in Heron Island today?
At 26.0°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 Heron Island.
View Snorkel Forecast →