World Climate Lab is a real-time planetary climate simulator. Build a world or bring your own, set its star, rotation, and atmosphere, then watch a complete climate system develop from physical first principles. Nothing here is hand-painted or faked. Winds, ocean currents, cloud bands, rainfall, and ice form because the physics says they must.

Bring your own world, or build one here

Import your own terrain and discover the climate it would truly have, or shape a world from scratch in the built-in topography editor. Raise mountain ranges, carve oceans, and position continents, then let the simulation reveal the winds, rains, and temperature your world produces. For worldbuilders, this is the answer to a question maps alone can never settle: what would the weather actually be?