Pack or skip
Insect repellent for Amsterdam in September
Verdict
Pack it
Warm (66°F) plus 10 rainy days = mosquito conditions.
Why
Amsterdam in September averages highs of 66°F, lows of 52°F, 10 rainy days.
That climate means insect repellent earns its space in the bag. Warm (66°F) plus 10 rainy days = mosquito conditions.