In terms of precipitation, rainfall in Kastamonu ranges from 0.4 - 2.8 inches per month. May is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit Kastamonu when rainfall is around 0.4 in.
If weather is an important factor for your trip to Kastamonu, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).