Planning for the weather is a good way to make your trip to La Castellana relaxing and enjoyable, especially when you're splurging. The hottest months are usually April and May with an average temp of 82°F, while the coldest months are February and January with an average of 79°F. The rainiest months in La Castellana are July, June, September, and October, with each month seeing an average of 19 inches of rainfall.