Planning for the weather is an important factor for making your trip to Siliguri a success, especially when you’re splurging. The hottest months are usually April and May, with an average temperature of 26°C, while the coldest months are January and December, with an average of 19°C. The rainiest months in Siliguri are July, June, August and September, with each month seeing an average of 724 mm of rainfall.