Planning for the weather is a good way to make your trip to Negril relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and September, with an average temperature of 28°C, while the coldest months are February and January, with an average of 26°C. The rainiest months in Negril are May, October, September and August, with each month seeing an average of 214 mm of rainfall.