The monsoon season in Siliguri and the North Bengal region starts normally during the second week of June and can last up to September. There is large variation of rainfall from year to year and annual rainfall ranges from 2600mm to 4000mm. Heavy rainfall occurs in the month of July and August; intense rainfall up to 200 mm per day has been recorded in these periods in the past. Although, water logging in some part of the town is common, Siliguri’s topography does not allow large areas getting flooded.

Windy conditions are prevalent in the autumn season but no cyclones have been reported yet in Siliguri.

If it was not for the amount of vehicular traffic in Siliguri, it would have maintained a pristine environment similar to the mountains surrounding it. Even though heavily commercialized, Siliguri still maintains an ideal climate and environment for its citizens and numerous visitors from different parts of the country and the world.