
Celest Science combines climate science and machine learning to enhance predictions and understanding of extreme weather events. Founded in March 2023 by Léo Lemordant and Pierre Gentine, the company leverages advanced AI techniques to provide high-resolution seasonal climate forecasts and physical risk assessments. Their innovative approach addresses the inadequacies of traditional risk assessment methods, focusing on industries such as insurance, energy, and agribusiness. With a mission to empower adaptation to climate change, Celest Science aims to deliver actionable insights that help clients manage climate-related risks effectively.

Celest Science combines climate science and machine learning to enhance predictions and understanding of extreme weather events. Founded in March 2023 by Léo Lemordant and Pierre Gentine, the company leverages advanced AI techniques to provide high-resolution seasonal climate forecasts and physical risk assessments. Their innovative approach addresses the inadequacies of traditional risk assessment methods, focusing on industries such as insurance, energy, and agribusiness. With a mission to empower adaptation to climate change, Celest Science aims to deliver actionable insights that help clients manage climate-related risks effectively.
Founded: March 2023
Headquarters / presence: Montpellier (registered) — presence in Paris and New York
Product focus: Physics-informed & generative AI for sub-seasonal to seasonal climate forecasts and physical risk assessment
Target sectors: Insurance, energy, agribusiness
Recent funding: Seed round — €2M (April 2025), lead investors astorya.vc and Plug & Play
Climate risk modeling and extreme weather prediction for commercial decision-making (insurance, energy, agribusiness).
2023
Data and Analytics
€2,000,000
Seed round reported as €2M; named angel/seed investors include Stéphane Guinet, Eric Mignot, Didier Valet, Christophe Neves, Armando Mann
“Lead investors astorya.vc and Plug & Play; participation from multiple angel/seed investors”