Fort Lauderdale Weather in August. Very similar to July, Fort Lauderdale weather in August is an interesting mix of intense heat, fleeting afternoon thunderstorms, beautifully warm seas and crystal clear blue skies.Hotels are chock full of tourists and the bars and cafes along the beach are filled to the brim with happy vacationing patrons.ven at dinner time the thermometer is often well above 80 degrees so if you're coming for a visit in August pack light both in the number of items you bring (because you'll be in your bathing suit most of the time) and the type of clothing you pack.