Taking the local weather in Greytown 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 September and May, with an average temperature of 27°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in Greytown are July, November, June and August, with each month seeing an average of 582 mm of rainfall.