Weather will likely play an important role when you plan your trip to San Ignacio, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and May with an average temp of 73°F, while the coldest months are January and February with an average of 67°F. The rainiest months in San Ignacio are June, October, September, and May, with each month seeing an average of 10 inches of rainfall.