Asad, first of all 7 days are best to explore Kashmir. Weather in Neelum Valley is like Naran, Kaghan as you know river neelum flows nearly parallel to Kunhaar. Sun is bright and you will feel hot in the sun while in shade its comfortable. At night some warm cloths will be required and incase of rain, ofcourse warm clothes.
For everyone, please take sun block with you and use it regularly.