The best time to visit the Ukraine is in the summer months. Temperatures range from 24 to 28 degrees C. When the sun is out it can be very warm, the humidity is low which also adds to the enjoyment. In the past month. In Odessa, the weather can vary. For example, visitors can experience cloudy days, short duration thunderstorms, and beautiful sunny days. A real mix, so as traveller be prepared. This is a northern latitude 46 degrees north and not unlike the coast of Washington State/Oregon. Rain intermixed with sun. Shorts and T-shirts are easily worn daily but the occasional cold snap will have you in long pants and jackets.
Check for weather report forcast at www.accuweather.com.
This site gives you up to 15 days forcast and is well worth using for all world travel destinations. You will find the weather superb in summer days, winter can be harsh and freak conditions can arise. Learn the language to ask the driver to slow down if you are using a taxi on open roads
The Ukrainre is a traveler dream. Costs are low, culture and "things to see" are in abundance. Enjoy!
