I mean, climate change being what it is, I’m literally brainstorming ways to inject artificial rain clouds into the sky.
My current idea is giant poles all over the city. They have blades at the top. They start rotating like a helicopter, but not designed to takeoff. Instead, it sprays cool mist above the blades so the cool mist gets swirled around in the hot air, that makes the whole city artificially humid. Eventually this should all rise up, and create rain clouds! Which then cool down the entire city.
Edit: Also, I have zero idea if this conceptually is even feasible.