Venice, Florence & Rome - Weather and Clothing

We are following the weather conditions for Venice, Florence, Rome as well as Termoli on the weather reports from the Weather Channel app on our iPhones. These are the reports for Wednesday, August 7th - Venice: 91, Florence: 99, Rome: 91 and Termoli:91. This seems unseasonably warm. We will make our trip to Italy in early September. Does anyone have an opinon or has heard a prediction for the weather at that time of the year? Trying to decide what to pack. I'm sure I can't go wrong with the layering, but was thinking the weather in September would be cooler.
Karen and David
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