Pack or skip
Thermal underwear for Tbilisi in May
Verdict
Skip it
Lows near 55°F — you'll overheat.
Why
Tbilisi in May averages highs of 75°F, lows of 55°F, 12 rainy days.
That climate means thermal underwear isn't pulling its weight. Lows near 55°F — you'll overheat.