January
Conditions depend more on region, weather or access.
YOUR YEAR BENEATH THE SURFACE
Tonga.
The cooler dry season generally offers more reliable scuba trips. Whale-swimming tours follow separate rules and may affect available boat space.
Best-season months: May, June, July, August, September, October, November
SEE THE WHOLE PICTURE
A month-by-month guide
February
Conditions depend more on region, weather or access.
March
Conditions depend more on region, weather or access.
April
Conditions depend more on region, weather or access.
May
Generally the most favourable seasonal window.
June
Generally the most favourable seasonal window.
July
Generally the most favourable seasonal window.
August
Generally the most favourable seasonal window.
September
Generally the most favourable seasonal window.
October
Generally the most favourable seasonal window.
November
Generally the most favourable seasonal window.
December
Conditions depend more on region, weather or access.
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