Pack or skip
Thermal underwear for Tbilisi in August
Verdict
Skip it
Lows near 66°F — you'll overheat.
Why
Tbilisi in August averages highs of 86°F, lows of 66°F, 6 rainy days.
That climate means thermal underwear isn't pulling its weight. Lows near 66°F — you'll overheat.