Planning for the weather is a good way to make your trip to Coyah relaxing and enjoyable, especially when you're splurging. The hottest months are usually December and January, with an average temperature of 27°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Coyah are August, July, September and June, with each month seeing an average of 709 mm of rainfall.