i have to go there in august for 3 days max and i believe that the weather is ok in that season.
Regarding security, in skardu/ gilgit, i did not hear of any problem there. Problem is in swat and adjoining areas and it reached till kaghan valley as militants had destroyed some TDCP Motels in kaghan. Skrdu / gilgit is far away however, going by road from pindi to skardu; land route may not be safe. I donot know the land route but i think it passes close to swat. Plz correct me if i m wrong.
Maray Huay Ko Gar Maara...Tou Kiya Maara! Thah kiya PTDC motel mein jo destroy kiya hai------:)
It passes almost by SWAT !
Baarish Ka Jaadu SURR Chahrr Ke Bolta Hai...Puray August mein wahaan...