Weather will likely play an important role when you plan your trip to Tumbaco, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and September, with an average temperature of 12°C, while the coldest months are July and August, with an average of 12°C. The rainiest months in Tumbaco are April, March, November and December, with each month seeing an average of 368 mm of rainfall.