The best season to visit Varanasi is between October and March when the temperatures area in a comfortable range of 5-15 degrees Celsius. This is a good time to be out sightseeing as the weather is pleasant and very cool.
The winter months are also when festivals are celebrated with enthusiasm and fervour in Varanasi. Dussehra and Bharat Milap are celebrated in quick succession in September/October followed by the festival of lights - Diwali. The Ganga Festival also takes place in November and this is the time when people come from far and near to pay obeisance to the holy river - Ganges.
The summer lasts from April to September/October and it gets really hot at this time with the temperatures shooting up to 45 degrees C at the height of the seasaon in May and June. The rains come in July and August bringing the temperatures down marginally but the humidity levels rise. Between May and June hot dry winds or 'loo' as it is called in local parlance, blow through the city making it quite impossible to be out in the day time sightseeing
