Flynn Reef Water Temperature
Updated Thu 11:21 (Australia/Brisbane)
Australia · Forecast updated Sep 17, 2026, 11:21 UTC
Current Sea Temperature
24.9°C
76.8°F
Mild water
Valid Sep 17, 2026, 11:21 (Australia/Brisbane). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.6°C below
The typical September average is 25.5°C (77.9°F) from the historical baseline.
Recent trend
At least two weeks of records are needed before showing a reliable trend.
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 Flynn Reef, typical monthly averages range from about 24.9°C (76.8°F) in August to 29.5°C (85.1°F) in January.
Over the past 30 days, the average sea temperature in Flynn Reef has been 24.9°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Flynn Reef, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 29.0–29.8°C | 29.5°C / 85.1°F |
| February | 29.0–30.0°C | 29.5°C / 85.1°F |
| March | 29.1–29.2°C | 29.1°C / 84.4°F |
| April | 28.3–28.9°C | 28.5°C / 83.3°F |
| May | 26.4–27.3°C | 26.8°C / 80.2°F |
| June | 25.6–26.6°C | 26.0°C / 78.8°F |
| July | 24.9–25.7°C | 25.2°C / 77.4°F |
| August | 24.5–25.3°C | 24.9°C / 76.8°F |
| September | 25.3–25.7°C | 25.5°C / 77.9°F |
| October | 25.7–26.9°C | 26.4°C / 79.5°F |
| November | 26.7–28.6°C | 27.6°C / 81.7°F |
| December | 28.2–29.2°C | 28.8°C / 83.8°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-16.71, 146.29). 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.
Flynn Reef in January
Typical January water temperature near Flynn Reef is 29.5°C (85.1°F), with yearly monthly means from 29.0–29.8°C.
Flynn Reef in February
Typical February water temperature near Flynn Reef is 29.5°C (85.1°F), with yearly monthly means from 29.0–30.0°C.
Flynn Reef in March
Typical March water temperature near Flynn Reef is 29.1°C (84.4°F), with yearly monthly means from 29.1–29.2°C.
Flynn Reef in April
Typical April water temperature near Flynn Reef is 28.5°C (83.3°F), with yearly monthly means from 28.3–28.9°C.
Flynn Reef in May
Typical May water temperature near Flynn Reef is 26.8°C (80.2°F), with yearly monthly means from 26.4–27.3°C.
Flynn Reef in June
Typical June water temperature near Flynn Reef is 26.0°C (78.8°F), with yearly monthly means from 25.6–26.6°C.
Flynn Reef in July
Typical July water temperature near Flynn Reef is 25.2°C (77.4°F), with yearly monthly means from 24.9–25.7°C.
Flynn Reef in August
Typical August water temperature near Flynn Reef is 24.9°C (76.8°F), with yearly monthly means from 24.5–25.3°C.
Flynn Reef in September
Typical September water temperature near Flynn Reef is 25.5°C (77.9°F), with yearly monthly means from 25.3–25.7°C.
Flynn Reef in October
Typical October water temperature near Flynn Reef is 26.4°C (79.5°F), with yearly monthly means from 25.7–26.9°C.
Flynn Reef in November
Typical November water temperature near Flynn Reef is 27.6°C (81.7°F), with yearly monthly means from 26.7–28.6°C.
Flynn Reef in December
Typical December water temperature near Flynn Reef is 28.8°C (83.8°F), with yearly monthly means from 28.2–29.2°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 |
|---|---|---|---|
| September | 24.6°C / 76.3°F | 24.8°C / 76.6°F | 25.0°C / 77.0°F |
Partial coverage: 1 calendar months with records. Profile calculated from 74 hourly forecast records across 1 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Flynn Reef
Outer-reef site off Cairns with coral bommies used on longer reef day trips.
- Area
- Queensland
Flynn Reef Water Temperature: Common Questions
What is the water temperature in Flynn Reef today?
The current sea surface temperature near Flynn Reef is 24.9°C (76.8°F). Over the last 30 days, the average has been 24.9°C.
When is the water warmest in Flynn Reef?
The water is typically warmest in January, at around 29.5°C (85.1°F) in the 2023–2025 historical baseline.
When is the water coldest in Flynn Reef?
The water is typically coldest in August, at around 24.9°C (76.8°F) in the same historical baseline.
Can you swim in Flynn Reef today?
At 24.9°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 Flynn Reef.
View Snorkel Forecast →