September in Tbilisi is generally warm and pleasant, with average daytime temperatures ranging from 20°C to 27°C (68°F to 81°F). Evenings can be cooler, so dressing in layers is advisable for comfort throughout the day.
During the day, lightweight and breathable clothing such as cotton or linen tops, blouses, and dresses are ideal. Pair them with comfortable trousers, skirts, or shorts, and don't forget stylish sunglasses and a wide-brimmed hat to protect against the sun.
Evenings in September can be cooler, so bring a light jacket or cardigan to stay warm. For dining out or visiting cultural sites, smart casual outfits are perfect, such as a nice dress or blouse combined with tailored pants or a skirt. Comfortable walking shoes are recommended for exploring the city.