Green Island Water Temperature
Updated Sat 13:17 (Australia/Brisbane)
Australia · Forecast updated Sep 26, 2026, 13:17 UTC
Current Sea Temperature
23.9°C
75.0°F
Mild water
Valid Sep 26, 2026, 13:17 (Australia/Brisbane). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.7°C below
The typical September average is 24.6°C (76.3°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 23.7°C, versus 23.8°C in the prior seven days.
What to wear
Mild water
A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
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 Green Island, typical monthly averages range from about 23.5°C (74.3°F) in August to 29.7°C (85.5°F) in January.
Over the past 30 days, the average sea temperature in Green Island has been 23.6°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Green Island, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 29.1–30.1°C | 29.7°C / 85.5°F |
| February | 29.1–30.1°C | 29.6°C / 85.3°F |
| March | 29.0–29.3°C | 29.1°C / 84.4°F |
| April | 28.0–29.0°C | 28.4°C / 83.1°F |
| May | 25.8–26.1°C | 25.9°C / 78.6°F |
| June | 24.4–24.6°C | 24.5°C / 76.1°F |
| July | 23.6–24.3°C | 23.9°C / 75.0°F |
| August | 23.1–24.1°C | 23.5°C / 74.3°F |
| September | 24.2–25.0°C | 24.6°C / 76.3°F |
| October | 25.5–26.9°C | 26.3°C / 79.3°F |
| November | 26.9–29.3°C | 28.0°C / 82.4°F |
| December | 28.3–29.6°C | 29.0°C / 84.2°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-16.79, 145.96). 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.
Green Island in January
Typical January water temperature near Green Island is 29.7°C (85.5°F), with yearly monthly means from 29.1–30.1°C.
Green Island in February
Typical February water temperature near Green Island is 29.6°C (85.3°F), with yearly monthly means from 29.1–30.1°C.
Green Island in March
Typical March water temperature near Green Island is 29.1°C (84.4°F), with yearly monthly means from 29.0–29.3°C.
Green Island in April
Typical April water temperature near Green Island is 28.4°C (83.1°F), with yearly monthly means from 28.0–29.0°C.
Green Island in May
Typical May water temperature near Green Island is 25.9°C (78.6°F), with yearly monthly means from 25.8–26.1°C.
Green Island in June
Typical June water temperature near Green Island is 24.5°C (76.1°F), with yearly monthly means from 24.4–24.6°C.
Green Island in July
Typical July water temperature near Green Island is 23.9°C (75.0°F), with yearly monthly means from 23.6–24.3°C.
Green Island in August
Typical August water temperature near Green Island is 23.5°C (74.3°F), with yearly monthly means from 23.1–24.1°C.
Green Island in September
Typical September water temperature near Green Island is 24.6°C (76.3°F), with yearly monthly means from 24.2–25.0°C.
Green Island in October
Typical October water temperature near Green Island is 26.3°C (79.3°F), with yearly monthly means from 25.5–26.9°C.
Green Island in November
Typical November water temperature near Green Island is 28.0°C (82.4°F), with yearly monthly means from 26.9–29.3°C.
Green Island in December
Typical December water temperature near Green Island is 29.0°C (84.2°F), with yearly monthly means from 28.3–29.6°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 |
|---|---|---|---|
| August | 22.6°C / 72.7°F | 23.0°C / 73.4°F | 23.5°C / 74.3°F |
| September | 23.1°C / 73.6°F | 23.7°C / 74.6°F | 24.1°C / 75.4°F |
Partial coverage: 2 calendar months with records. Profile calculated from 1174 hourly forecast records across 2 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Green Island
Cairns coral cay with shallow reef, turtles and easy lagoon snorkeling.
- Area
- Queensland
Green Island Water Temperature: Common Questions
What is the water temperature in Green Island today?
The current sea surface temperature near Green Island is 23.9°C (75.0°F). Over the last 30 days, the average has been 23.6°C.
When is the water warmest in Green Island?
The water is typically warmest in January, at around 29.7°C (85.5°F) in the 2023–2025 historical baseline.
When is the water coldest in Green Island?
The water is typically coldest in August, at around 23.5°C (74.3°F) in the same historical baseline.
Can you swim in Green Island today?
At 23.9°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 Green Island.
View Snorkel Forecast →