The average minimum temperature (usually the minimum temperature is noted during the night) in Kutaisi in September is 17.0°C (62.6°F). September falls in the rainy season with an average precipitation of 262mm (10.3in). This month generally has very pleasant temperatures. The average maximum temperature lies around 23.0°C (73.4°F). If you enjoy looking at a blue sky and like sunbathing than this month is a great period to visit Kutaisi. It has 202 hours of sun.
So what to wear in September? Visitors traveling to Kutaisi should plan on bringing a totally waterproof rain jacket since it will often be raining. Also bring your shorts and or a skirt because it can be very nice and warm.