Taking the local weather in Horn Island into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually January and December, with an average temperature of 27°C, while the coldest months are August and July, with an average of 25°C. The rainiest months in Horn Island are March, May, April and February, with each month seeing an average of 375 mm of rainfall.