Cairns · Month comparison

May vs July

July ranks #1 overall vs May at #3. Peak season — the best reef conditions of the year with Australian and international visitors at maximum

Great Barrier Reef coral garden in peak dry season crystal water

May

#3 of 12 months

Best match

Dry season in full swing — perfect reef conditions, whale shark season begins and the best weather of the year

  • ↑Crystal clear reef water (25–30m visibility); diving and snorkelling at peak quality
  • ↑Whale shark season: the world's largest fish regularly spotted near Cairns from May
Great Barrier Reef Outer Reef in peak July conditions with coral and fish

July

#1 of 12 months

Best match

Peak season — the best reef conditions of the year with Australian and international visitors at maximum

  • ↑The most reliably excellent conditions: clear skies, flat seas and 30m+ reef visibility
  • ↑Dwarf minke whale encounters (June-July only) unique to the northern Great Barrier Reef
FactorMayJuly
Weather score
9
9
Value score
6
4
Crowd score
5
8
Events score
5
5
Atmosphere
8
8
Avg high temp28°C25°C
Monthly rain93mm23mm
Daily sunshine9.5hrs11hrs

May trade-offs

  • ↓School holiday season beginning (Southern Hemisphere May school holidays push prices up)
  • ↓Popular reef tours at Agincourt and Outer Reef booking out quickly

July trade-offs

  • ↓Maximum crowds; popular reef pontoons at Agincourt can have 200+ visitors simultaneously
  • ↓July school holiday peak: every liveaboard and dive operator fully booked, prices at maximum
See all 12 months for Cairns →May in detail →July in detail →
Scores compare months within Cairns. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →