Pack or skip
Insect repellent for Jacksonville in September
Verdict
Pack it
Warm (87°F) plus 12 rainy days = mosquito conditions.
Why
Jacksonville in September averages highs of 87°F, lows of 70°F, 12 rainy days.
That climate means insect repellent earns its space in the bag. Warm (87°F) plus 12 rainy days = mosquito conditions.