Among those who have arrived include; Ghana President Nana Addo Akufo-Addo, Rwanda's Paul Kagame, Ethiopia President Sahle-Work Zewde, Mozambique President Filipe Jacinto Nyusi, Libya leader Mohamed al-Menfi, his Sierra Leone counterpart Julius Maada Wonie Bio.
Interestingly, the Sahrawi Arab Democratic Republic President Brahim Ghali has made his first appearance in Nairobi after President Ruto attempted to erase the country's presence in Kenya earlier this year.
COP28 President-Designate Dr Sultan Al Jaber is also in Nairobi for the summit and is expected to make a major declaration on Tuesday, September 5.
The climate summit enters day two, with several outcomes expected as African leaders and climate stakeholders stamp foot on the impact of climate change on the continent.
Additional information by Mwangi Maina and Purity Museo