Agincourt Reef Water Temperature
Updated Thu 10:46 (Australia/Brisbane)
Australia · Forecast updated Sep 17, 2026, 10:46 UTC
Current Sea Temperature
24.6°C
76.3°F
Mild water
Valid Sep 17, 2026, 10:46 (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 below
The typical September average is 25.4°C (77.7°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 Agincourt Reef, typical monthly averages range from about 24.6°C (76.3°F) in August to 29.9°C (85.8°F) in January.
Over the past 30 days, the average sea temperature in Agincourt Reef has been 24.6°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Agincourt Reef, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 29.4–30.2°C | 29.9°C / 85.8°F |
| February | 29.1–30.0°C | 29.5°C / 85.1°F |
| March | 29.1–29.4°C | 29.3°C / 84.7°F |
| April | 28.3–29.1°C | 28.6°C / 83.5°F |
| May | 26.3–26.9°C | 26.6°C / 79.9°F |
| June | 25.3–26.2°C | 25.6°C / 78.1°F |
| July | 24.7–25.4°C | 25.0°C / 77.0°F |
| August | 24.4–25.1°C | 24.6°C / 76.3°F |
| September | 25.1–25.7°C | 25.4°C / 77.7°F |
| October | 25.8–27.0°C | 26.4°C / 79.5°F |
| November | 26.8–28.9°C | 27.8°C / 82.0°F |
| December | 28.4–29.6°C | 29.1°C / 84.4°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-16.04, 145.88). 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 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Agincourt Reef in January
Typical January water temperature near Agincourt Reef is 29.9°C (85.8°F), with yearly monthly means from 29.4–30.2°C.
Agincourt Reef in February
Typical February water temperature near Agincourt Reef is 29.5°C (85.1°F), with yearly monthly means from 29.1–30.0°C.
Agincourt Reef in March
Typical March water temperature near Agincourt Reef is 29.3°C (84.7°F), with yearly monthly means from 29.1–29.4°C.
Agincourt Reef in April
Typical April water temperature near Agincourt Reef is 28.6°C (83.5°F), with yearly monthly means from 28.3–29.1°C.
Agincourt Reef in May
Typical May water temperature near Agincourt Reef is 26.6°C (79.9°F), with yearly monthly means from 26.3–26.9°C.
Agincourt Reef in June
Typical June water temperature near Agincourt Reef is 25.6°C (78.1°F), with yearly monthly means from 25.3–26.2°C.
Agincourt Reef in July
Typical July water temperature near Agincourt Reef is 25.0°C (77.0°F), with yearly monthly means from 24.7–25.4°C.
Agincourt Reef in August
Typical August water temperature near Agincourt Reef is 24.6°C (76.3°F), with yearly monthly means from 24.4–25.1°C.
Agincourt Reef in September
Typical September water temperature near Agincourt Reef is 25.4°C (77.7°F), with yearly monthly means from 25.1–25.7°C.
Agincourt Reef in October
Typical October water temperature near Agincourt Reef is 26.4°C (79.5°F), with yearly monthly means from 25.8–27.0°C.
Agincourt Reef in November
Typical November water temperature near Agincourt Reef is 27.8°C (82.0°F), with yearly monthly means from 26.8–28.9°C.
Agincourt Reef in December
Typical December water temperature near Agincourt Reef is 29.1°C (84.4°F), with yearly monthly means from 28.4–29.6°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 |
|---|---|---|---|
| September | 24.0°C / 75.2°F | 24.4°C / 75.9°F | 24.6°C / 76.3°F |
Partial coverage: 1 calendar months with records. Profile calculated from 73 hourly forecast records across 1 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Agincourt Reef
Ribbon reef on the outer edge off Port Douglas, reached by boat when swell and wind allow.
- Area
- Queensland
Agincourt Reef Water Temperature: Common Questions
What is the water temperature in Agincourt Reef today?
The current sea surface temperature near Agincourt Reef is 24.6°C (76.3°F). Over the last 30 days, the average has been 24.6°C.
When is the water warmest in Agincourt Reef?
The water is typically warmest in January, at around 29.9°C (85.8°F) in the 2023–2025 historical baseline.
When is the water coldest in Agincourt Reef?
The water is typically coldest in August, at around 24.6°C (76.3°F) in the same historical baseline.
Can you swim in Agincourt Reef today?
At 24.6°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 Agincourt Reef.
View Snorkel Forecast →