Best time to dive Southern GBR
Reef mantas are resident year-round at Lady Elliot, peaking May–August (exceptional ~30 m visibility in May–June); humpbacks pass in winter. Water about 23 °C in winter, 27 °C in summer.
Peak season: May–August
Overall diving, month by month
Balanced scoring · forecasts include the 2026/27 El Niño outlook
Confidence: Nov medium · Dec medium · Jan medium · Feb medium · Mar medium · Apr medium · May medium · Jun medium · Jul medium · Aug medium · Sep medium · Oct low · Nov low · Dec low
What's good when
Each attribute scored 0–10 for every month
| Nov2026 | Dec | Jan2027 | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pelagic & big animals | 7 | 7 | 7 | 7 | 7 | 7 | 9 | 9 | 9 | 9 | 8 | 7 | 7 | 7 |
| Macro life | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Coral & reef health | 5 | 4 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Visibility | 8 | 7 | 7 | 7 | 7 | 8 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 7 |
| Water temperature | 7 | 8 | 9 | 9 | 9 | 8 | 7 | 5 | 5 | 4 | 5 | 5 | 7 | 8 |
| Weather & sea state | 7 | 7 | 6 | 6 | 7 | 7 | 8 | 8 | 7 | 8 | 8 | 8 | 7 | 7 |
| Operations & access | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
Climate outlook
How this year's forecast differs from a typical year
- Coral & reef health -1.3 · Reefs recovering from El Niño summer bleaching (Nov 2026 – December 2027)
- Coral & reef health -2.3 · El Niño summer marine heatwave; very high mass-bleaching risk (Jan 2027 – April 2027)
Water temperature & visibility
| Month | Water | Visibility |
|---|---|---|
| November 2026 | 24.5 °C (76 °F) | 20–30 m |
| December 2026 | 26.0 °C (79 °F) | 15–25 m |
| January 2027 | 27.0 °C (81 °F) | 15–25 m |
| February 2027 | 27.5 °C (82 °F) | 15–25 m |
| March 2027 | 27.0 °C (81 °F) | 15–25 m |
| April 2027 | 26.0 °C (79 °F) | 20–30 m |
| May 2027 | 24.5 °C (76 °F) | 25–35 m |
| June 2027 | 23.0 °C (73 °F) | 25–35 m |
| July 2027 | 22.0 °C (72 °F) | 25–35 m |
| August 2027 | 21.5 °C (71 °F) | 25–35 m |
| September 2027 | 22.0 °C (72 °F) | 20–30 m |
| October 2027 | 23.0 °C (73 °F) | 20–30 m |
| November 2027 | 24.5 °C (76 °F) | 20–30 m |
| December 2027 | 26.0 °C (79 °F) | 15–25 m |
Marine life calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| reef manta | ● | ● | ● | ● | Peak | Peak | Peak | Peak | ● | ● | ● | ● |
| humpback whale | ● | ● | ● | ● | ||||||||
| green turtle | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● |
| leopard shark | ● | ● | ● | ● | ● |
Peak = best odds · ● = regularly seen · blank = unlikely. Calendar months, every year.
About the diving
- Difficulty
- Beginner
- Current strength
- 2 / 5
- Luxury level
- 3 / 5
- Typical depth
- 3–25 m
- Max depth of interest
- 30 m
- Dive styles
- Resort, Day boat
- Suggested certification
- Open Water
- Nearest airport
- BDB
- Snorkelling
- Good
- Known for
- reef manta, green turtle, humpback whale, leopard shark
Famous sites: Lighthouse Bommies · Coral Gardens · Heron Bommie · Blow Hole
Season notes & sources
- Reef mantas are resident year-round at Lady Elliot, peaking May–August (exceptional ~30 m visibility in May–June); humpbacks pass in winter. Water about 23 °C in winter, 27 °C in summer.
Sources
- Swim with manta rays on the Great Barrier Reef (Queensland)
- Best time to visit Lady Elliot Island (TravelOnline)
- Jaine et al. 2012, reef manta sighting trends at Lady Elliot Island (PLoS ONE)
- Dudgeon et al. 2008, zebra shark summer aggregation in southeast Queensland (Marine Ecology Progress Series 368)
- Great Barrier Reef at risk of 'collapse', scientists warn (The Star, Jul 2026)