Planning for the weather is a good way to make your trip to St. Anns relaxing and enjoyable, especially when you’re splurging. The hottest months are usually September and October, 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 St. Anns are October, November, August and July, with each month seeing an average of 209 mm of rainfall.