Pack or skip
Thermal underwear for Tbilisi in October
Verdict
Skip it
Lows near 50°F — you'll overheat.
Why
Tbilisi in October averages highs of 68°F, lows of 50°F, 10 rainy days.
That climate means thermal underwear isn't pulling its weight. Lows near 50°F — you'll overheat.