Kyiv has faced weeks of severe energy supply problems due to persistent Russian airstrikes.
At least eight schools and 10 healthcare facilities, including a maternity hospital, were reportedly damaged in the past week.
Ukraine had exported 8.9 million tonnes of grain in the 2023/24 July-June season, down from 12.9 million in the same period in 2022/23.
Meanwhile, the UN and partners have continued to support people across Ukraine.
During his visit, the UN chief will stop by one of the three Ukrainian ports involved in the framework of the Black Sea Initiative to export wheat grain.
The ships contained more than 370,000 tonnes of grain and other food items.
Hopes are currently pinned on the agreement with Russia enabling a resumption of regular Ukrainian agricultural exports via the Black Sea.
Ukrainian drone attacks are preventing Russian troops from making further gains in the western region of the Black Sea, an assessment by British intelligence showed.
