Planning for the weather is a good way to make your trip to Kalasin relaxing and enjoyable, especially when you're splurging. The hottest months are usually April and March, with an average temperature of 30°C, while the coldest months are January and December, with an average of 25°C. The rainiest months in Kalasin are September, July, August and May, with each month seeing an average of 285 mm of rainfall.