The epicentre of the quake, which was mild, was in Kangra district.
Earlier, a moderate intensity earthquake of magnitude-5 hit the state July 9.
At that time its epicentre was on the border of districts of Chamba and Lahaul-Spiti, bordering Jammu and Kashmir.
Before that, the state was rocked by low intensity earthquakes four times between June 5 and 6.
Himachal Pradesh had witnessed the most devastating earthquake in 1905 in the Kangra Valley, in which more than 20,000 people were killed.