The weather is hot most of the year with variations from region to region. The coolest weather lasts from around December to February, with fresh mornings and evenings and mostly sunny days. The really hot weather, when it is dry, dusty and unpleasant, is between March and June. Monsoon rains occur in most regions in summer anywhere between June and early October. 

Western Himalayas: Srinagar is best from March to October; July to August can be unpleasant; cold and damp in winter. Shimla is higher and therefore colder in winter. Places like Gulmarg, Manali and Pahalgam are usually under several feet of snow from December to March and temperatures in Ladakh can be extremely cold. The mountain passes of Ladakh are accessible from July to October.

Required clothing: Light- to mediumweights are advised from March to October, with warmer wear for winter. Weather can change rapidly in the mountains and therefore it is important to be suitably equipped. Waterproofing is advisable.

Northern Plains: This extreme climate is typically warm inland from April to mid-June, falling to almost freezing at night in winter between November and February. Summers are hot with monsoons between June and September.

Required clothing: Lightweights in summer with warmer clothes in winter and on cooler evenings. Waterproofing is essential during monsoons.

Central India: Madhya Pradesh state escapes the very worst of the hot season, but monsoons are heavy between July and September. Temperatures fall at night in winter.

Required clothing: Lightweights are worn most of the year with warmer clothes during evenings, particularly in winter. Waterproofed clothing is advised during monsoon rains.

Western India: November to February is most comfortable, although evenings can be fairly cold. Summers can be extremely hot with monsoon rainfall between mid June and mid September.

Required clothing: Lightweights are worn most of the year with warmer clothes for cooler winters, and waterproofing is essential during the monsoon.

Southwest: The most pleasant weather is from November to March. Monsoon rains fall anywhere between late April and July. Summer temperatures not as high as Northern India although humidity is extreme. The coast benefits from some cooling breezes. Inland, Mysore and Bijapur have pleasant climates with relatively low rainfall. 

Required clothing: Lightweights. Waterproofing is necessary during the monsoon. Warmer clothes are worn in the winter, particularly in the hills.

Southeast: Tamil Nadu experiences a northeast monsoon between October and December and temperatures and humidity are high all year. The hills can be cold in winter. 

Required clothing: Lightweights. Waterproofing is necessary during the monsoon. Warmer clothes are worn in the winter, particularly in the hills.

Northeast: March to June and September to November are the driest and most pleasant periods. The rest of the year has extremely heavy monsoon rainfall.

Required clothing: Lightweights. Waterproofing is advisable throughout the year and essential in monsoons, usually from mid June to mid October. Warmer clothes are useful for cooler evenings.