If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Nambucca Heads: The hottest months are usually January and February, with an average temperature of 23°C, while the coldest months are July and August, with an average of 15°C. The rainiest months in Nambucca Heads are March, February, January and December, with each month seeing an average of 191 mm of rainfall.