October in La Fortuna is the rainiest month of the year. In October, the weather in La Fortuna is typically warm. Average daily high temperature in October is about 27 degrees above zero. On average, La Fortuna has 30 rainy and 1 cloudy day in October. The rains are usually heavy. October as well as May, June, July, and August is considered the most uncomfortable time to visit La Fortuna.