Weather will likely play an important role when you plan your trip to Avon, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 26°C, while the coldest months are January and February, with an average of 12°C. The rainiest months in Avon are August, September, July and November, with each month seeing an average of 199 mm of rainfall.