INSTRUMENT / SEA TEMPERATURE
Green Island Water Temperature
Updated Tue 14:50 (Australia/Brisbane)
Australia · Forecast updated Nov 10, 2026, 14:50 UTC
Current Sea Temperature
28.8°C
83.8°F
Very warm water
Valid Nov 10, 2026, 14:50 (Australia/Brisbane). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.8°C above
The typical November average is 28.0°C (82.4°F) from the historical baseline.
Recent trend
Warming by 0.9°C
Seven-day average: 28.6°C, versus 27.7°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
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 27.0°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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: December 29.0°C · February 29.6°C.
Explore Green Island sea temperature in January, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: January 29.7°C · March 29.1°C.
Explore Green Island sea temperature in February, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: February 29.6°C · April 28.4°C.
Explore Green Island sea temperature in March, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: March 29.1°C · May 25.9°C.
Explore Green Island sea temperature in April, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: April 28.4°C · June 24.5°C.
Explore Green Island sea temperature in May, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: May 25.9°C · July 23.9°C.
Explore Green Island sea temperature in June, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: June 24.5°C · August 23.5°C.
Explore Green Island sea temperature in July, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: July 23.9°C · September 24.6°C.
Explore Green Island sea temperature in August, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: August 23.5°C · October 26.3°C.
Explore Green Island sea temperature in September, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: September 24.6°C · November 28.0°C.
Explore Green Island sea temperature in October, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: October 26.3°C · December 29.0°C.
Explore Green Island sea temperature in November, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: November 28.0°C · January 29.7°C.
Explore Green 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 |
|---|---|---|---|
| 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 |
| October | 23.6°C / 74.5°F | 25.6°C / 78.0°F | 28.2°C / 82.8°F |
| November | 27.6°C / 81.7°F | 28.5°C / 83.3°F | 29.5°C / 85.1°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2255 hourly forecast records across 4 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 28.8°C (83.8°F). Over the last 30 days, the average has been 27.0°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 28.8°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 →