Weather can make or break a road trip, so we've gathered some data about year-round temperatures in Gangaw to help you plan yours. The hottest months are usually April and March, with an average temperature of 23°C, while the coldest months are January and December, with an average of 16°C. The rainiest months in Gangaw are July, August, June and September, with each month seeing an average of 480 mm of rainfall.