Summer in Sydney (Dec, Jan, Feb)
- Outside air temperature averages 25-27c
- Water temperature averages 20-23c
- Visibility drops with the algae blooms and additional plankton in the water
- Longest days where diving is possible for much of the day (with night dives typically delayed until 8pm at night)
- Top marine life for summer months includes the docile Grey Nurse sharks and tropical fish like cowfish
- Plan early starts to get best parking spots
Autumn in Sydney (Mar, Apr, May)
- Outside air temperature averages 20-25c
- Water temperature averages 18-21c
- Cyclones are common in northern Queensland, which can mean swell is more common
- Visibility improves underwater
- Giant Cuttlefish become common to see
Winter in Sydney (Jun, Jul, Aug)
- Outside air temperature drops to 16-19c
- Water temperature averages 16-18c
- Whale migration (south direction) over June and July means you can hear whales singing underwater
- Visibility improves and can be 10-15m
- It is more common to see the Wobbegong sharks, Port jackson sharks and Crested Hornsharks on dives
- Temperate fish migrate up to Sydney and large schools of fish are common
Spring in Sydney (Sep, Oct, Nov)
- Outside air temperature averages 20-24c
- Water temperature averages 17-21c
- Whale migration (north direction) over September and October means you can hear whales singing underwater
- Visibility drops with more groundswells creating greener water
- Start to see baby port jackson sharks in the harbour and on sandy patches