Increase in rainfall activity is likely in terms of intensity and spread in Himachal Pradesh on July 9 and 10, the Meteorological department here said on Saturday. The MeT department forecast widespread moderate to heavy rainfall in Sirmaur, Solan, Shimla, Mandi, Kullu, Hamirpur, Kangra, Bilaspur districts and adjoining areas including Shimla town for these two days.