Weather in a Rockstar game lives between atmosphere and mechanic. We work through what's likely for GTA 6 here.

For the storm-specific content, see the storm scenes piece.

What's likely

Rain, certain. Sun, certain. Cloud cover, certain. Wind effects - probably visible. Lightning - probably during storms. Daily weather variation - certain.

Florida-specific: thunderstorms in the afternoon. Hurricane-force events as occasional set pieces. Heat haze on the highways. All plausible based on real-Florida weather.

What's possible but not certain

Dynamic flooding (rain accumulation altering traversal). Dynamic tide (sea level changing). Hurricane events as repeating dynamic content. Wildlife responding to weather.

RDR2 demonstrated some of these. Whether GTA 6 carries them across is unconfirmed.