Month-specific sea-surface temperature · Australia
Great Barrier Reef Sea Temperature in October
26.3°C
79.3°F
In October, sea-surface temperature near Great Barrier Reef has a historical monthly average of 26.3°C. This is not the reading for any particular holiday date.
Across 2023–2025, the lowest and highest yearly October monthly means were 25.7–26.8°C. These are not daily extremes.
Previous month
September · 24.7°C
Change into October: +1.6°C
Next month
November · 28.0°C
Change into next month: +1.7°C
Can you swim or snorkel in Great Barrier Reef in October?
At 26.3°C our temperature-only guide describes the water as warm water. Comfort depends on your cold tolerance, immersion time and wind. A historical average cannot determine whether conditions are safe on any given day.
Do you need a wetsuit?
Most people are comfortable in swimwear or a light rash guard.
Which beach should you choose?
Look for a beach sheltered from the actual forecast waves and wind on your visit. Exposure, currents and entry conditions vary even where water temperatures are similar. Follow local warnings.
Check the current waves, wind and snorkeling forecast →
A live forecast does not predict a future October. Check again close to your trip.
Waves and wind: recorded-model conditions for October
These figures come from a separately modelled, date-specific wind/wave backfill, not the NOAA SST series. A single observed season is not a climatological likelihood or a guarantee of safe conditions.
Morning calm hours
50%
Afternoon calm hours
55%
Historical coverage
October 2025
31 valid days
A “calm hour” meets fixed modelled wave/wind thresholds; neither visibility nor local currents, entry conditions or actual beach safety is measured here. Periods may differ by coast.
Nearby places in October
Comparable historical averages from independent marine grid cells. Warmer water does not imply safe snorkeling.
- Low Isles 26.7°C
- Agincourt Reef 26.4°C
- Port Douglas 26.8°C
- Hastings Reef 26.4°C
- Michaelmas Cay 26.2°C
- Moore Reef 26.3°C
Data source and limitations
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2023–2025. Marine model grid near -16.29, 145.70. Based on 3 yearly monthly means and 2232 recorded samples. Source methodology.
Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.