The summer season in Assam starts from the month of May and extends till the end of August. Summer is generally fry and humid. But Cool wind always blows here due to its proximity from the Brahmaputra river, The average temperature during summer is between 35 and 38 degree Celsius. Light cotton clothes are the best option during summers.
Guwahati received moderate to heavy rainfall during the monsoon months of May to September. You can travel to Guwahati during this time too as the flight rates are comparatively cheaper at this time. You might not be able to go for the Brahmaputra River cruise if the weather is bad and the water level of the river rises.
The winter season at the place comes in the month of December and stays till the month of February. This is the best time to enjoy a holiday in Assam. The weather is mostly pleasant with minimum temperature barely reaching five Degrees Celsius. The Magh Bihu or Bhogali Bihu is celebrated during January while the Kati or Kangali Bihu is celebrated during the month of November.