Planning for the weather is an important factor for making your trip to Sayulita a success, especially when you’re splurging. The hottest months are usually May and June, with an average temperature of 26°C, while the coldest months are February and January, with an average of 22°C. The rainiest months in Sayulita are August, September, July and June, with each month seeing an average of 265 mm of rainfall.