Weather will likely play an important role when you plan your trip to Lizard Island, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually December and January with an average temp of 80°F, while the coldest months are August and July with an average of 73°F. The rainiest months in Lizard Island are January, March, February, and December, with each month seeing an average of 12 inches of rainfall.