Plateau???

Okay most of you are having a heatwave and its been very hot and humid where I am... so that means more water.. Witch isn't my problem.. My problem is this freaking weight!!! I hit a plateau and how in the world do I break it?? Last time I hit a plateau it took two weeks.. I don't wanna wait two weeks.. Do you think I should walk in this hot and humid weather to sweat out some pounds?? Or even ounces??? please help!! Its so annoying! Thanks!! oh yes anyone feel free to add me =)