Pack or skip
Insect repellent for Ljubljana in September
Verdict
Pack it
Warm (72°F) plus 10 rainy days = mosquito conditions.
Why
Ljubljana in September averages highs of 72°F, lows of 52°F, 10 rainy days.
That climate means insect repellent earns its space in the bag. Warm (72°F) plus 10 rainy days = mosquito conditions.