We will never cancel a tour due to rain! The weather in Bangkok and Chiang Mai is unpredictable and rain can occur at any time, especially during the rainy season of July-September. Rain is also a very localized phenomenon, happening in small pockets in places while being completely dry only a few kilometers away.
In our vast experience doing the tours, we know that heavy rains rarely last more than 30 minutes and our guides know very well where to take our customers for cover during the deluge. In light rain, we provide ponchos to our customers and cycle on. Often times, the rain will offer a refreshing break from the tropical heat.