Summer is the most popular times for travel on the Arenal Volcano and, understandably so since most of the days are sunny and warm. The temperatures range from 28 to a high of 32 degrees Celsius, with very little rainfall if any.
If you enjoy warmer weathers but do not want to travel during the busiest seasons, then you may prefer to travel during the rainy season. The weather is nearly as warm as it is in the summer with temperatures ranging between 22 to 27 degrees Celsius. Rainfall is between 26 and 30 mm.
The temperatures drop during the rainy season but the climate is still mild, with temperatures ranging from 19 to 28 degrees Celsius. Fortunately, Arenal Volcano is part of the costa Rica central mountain range, keeping it warmer year around.
From May through the month of November, Costa Rica reports its rainy season and this allows the environment to dress in green, with larger crops.