Pack or skip
Insect repellent for Denver in September
Verdict
Pack it
Warm (77°F) plus 7 rainy days = mosquito conditions.
Why
Denver in September averages highs of 77°F, lows of 48°F, 7 rainy days.
That climate means insect repellent earns its space in the bag. Warm (77°F) plus 7 rainy days = mosquito conditions.