iRacing random weather testing will begin with Season 4 2026 as the simulator experiments with less predictable race conditions. The company plans to test new weather re-roll systems in selected series rather than changing the entire service at once. These tests will generate conditions either for individual races or for each race day. iRacing will then use feedback and collected data to guide future changes. The experiments form part of the wider iRacing Season 4 update. They follow continued discussion about how the simulator uses its dynamic weather system in official racing. iRacing says development has continued behind the scenes despite relatively little public information in recent months. How iRacing Random Weather Will Work iRacing plans to test two different approaches. The first will generate a new weather re-roll for each race. The second will generate new conditions for each race day. Both systems aim to increase variation without replacing the existing dynamic weather simulation. Per-race re-rolls could produce the biggest difference for regular competitors. Two races using the same series and circuit could potentially feature different conditions. Drivers would therefore have less certainty about what they will face before entering a session. The per-race-day option takes a more conservative approach. Conditions could remain consistent across races held during the same day before changing for another race day. iRacing has not yet decided which system could eventually become the standard. Selected Series Will Test More Rain iRacing will not introduce these changes everywhere immediately. The development team is working with community managers from a selection of series to test the new weather behavior. Some of those series will also use forecasts with a greater chance of rain. This approach gives iRacing an opportunity to study how different systems affect participation and racing. It also allows the developers to collect feedback