iRacing has significantly expanded its new Weather Reroll system for 2026 Season 4, with 34 official Sports Car and Formula Car series now regenerating weather conditions for every individual race session.
iRacing originally described these experiments in its August 2026 Development Update as a measured test rather than a service-wide overhaul.
The other weeks can still receive regenerated weather conditions without introducing rain.
The Fixed series is explicitly included, while the corresponding Open series does not appear in iRacing’s initial rollout.
iRacing Plans to Expand the System Further The 34-series implementation is not intended to be the final scope of Weather Rerolls.