Will I be hot?
Will I be hot in Ljubljana in May?
Verdict
No — No, comfortable.
Highs cap at 70°F — no heat-management gear needed.
Day vs. night
Day
70°F
Comfortable
A T-shirt and a light overshirt is enough.
Night
51°F
Cool
You'll want a warm layer after sunset — not a heavy coat.
Why
Ljubljana in May averages highs of 70°F, lows of 51°F, 12 rainy days.
Temperature is comfortable across the day; pack for style and weather resistance, not heat management.