India and most of South Asia has a warm to very hot weather. Northern India has a pleasant weather from October to March.
The winter month will require light woollen. The dry hot weather is from April through mid July before monsoon begins.
Light cotton will be ideal during this period.
The Central, Eastern and Southern India have a warm and humid climate and are more comfortable during September through
February. There are areas in the South closer to the Western Ghats those are cooler and comfortable throughout the year
such as Bangalore, Ooty, Kodaikanal etc which requires light woollen.
It's difficult to pin down the best time to visit India weather-wise because of the wide range of climatic factors.
Broadly speaking September to March is the most pleasant months over much of the country. In the south, October
to February is more pleasant, while Sikkim and the areas of northeastern India are comfortable between March and August.
Kashmir and the mountainous regions of Himachal Pradesh are best accessed between May and September.
The deserts of Rajasthan and the northwestern Indian Himalayan region are at their best during the monsoon.
The trekking season in the Indian Himalayas runs roughly from April to November. The ski season is between January and March.
Travel health depends on your pre-departure preparations, your daily health care and the way you handle any medical
problem that does develop. While the potential dangers can seem quite frightening, in reality few travellers experience
anything more than an upset stomach.
Inoculation is recommended for cholera, typhoid, hepatitis and malaria.
Even though potable water is available in plenty, as a traveller it is advisable to stick to brand bottled water or beverages.
If bottled water is not available, try to use only boiled water.
Modern health facilities are available in most of the areas. But sufficient services are available more in urban areas
than the rural areas. Medical facilities are expensive but are much cheaper when compared to that of the developed countries.
For more current information on travellerls health, please follow the link Traveller's Health