"The monsoon today entered the National Capital Region that includes places like Gurugram, Faridabad, Rohtak and Sonepat," a MeT Department official said here.
The monsoon is expected to fully cover the two states, including the Union Territory, within the next few days.
Last year too, the monsoon had entered the two states on July 2.
Punjab and Haryana, the grain bowl states of the country, had received scanty monsoon rains during last two years.
Meanwhile, high humidity prevailed in several areas, including Chandigarh, Ambala, Karnal, Amritsar, Patiala, Jalandhar and Ludhiana.