Pack or skip
Flip-flops for Philadelphia in September
Verdict
Pack it
Highs around 78°F — perfect flip-flop weather.
Why
Philadelphia in September averages highs of 78°F, lows of 58°F, 8 rainy days.
That climate means flip-flops earns its space in the bag. Highs around 78°F — perfect flip-flop weather.