The IMD has issued heatwave alerts for parts of Rajasthan, Haryana, Delhi, Odisha, Punjab, Telangana, Chhattisgarh and Uttar Pradesh on May 28.
At the same time, thunderstorms, strong winds and even hailstorms are expected in parts of Haryana, Punjab, Himachal Pradesh, Jammu and Kashmir and Delhi.
Several states, including Bihar, West Bengal, Punjab, Haryana and Uttar Pradesh, may witness strong winds blowing at speeds of 50 to 70 kmph along with light rain in some areas.
Weather officials said temperatures may fall by 3°C to 7°C in many northern states from May 29 onwards.