Use soap free cleansers in order to retain the moisture in your skin
Avoid sun exposure especially from 12 o clock in noon till 3pm.
Use a broad spectrum sunscreen in summers to protect your skin from both UVA and UVB radiation on all exposed areas.
Besides sunscreen, also wear lip protection, sunglasses and a broad brimmed hat when you go out.
Choose water based creams in summers.
Use facial scrubs after washing your skin to remove the sun tan.