Ni Hou.
I am travelling to Beijing in June for 6 days. I planned to stay at Tianjin for 1 day before heading to Beijing the next 5 days. Is it sufficient to visit all famous places in Beijing ? where else can i go within the 5 days in Beijing ( to somewhere near outskirts province ) to see others sightseings? What is the summer temperature like? Is it cold in the night?

Also, where can i buy some cheap or local design t-shirts or clothes for shopping in Beijing?