WEATHER FORECAST

The weather around World Wide Technology Raceway in early September is typically warm and slightly humid, offering a pleasant late‑summer atmosphere for race weekend. Daytime highs usually range from the low to mid‑80s°F (27–30°C), while evenings cool down to the mid‑60s°F (17–19°C). Humidity can still be noticeable, but conditions are generally more comfortable than the peak of summer in July or August.

Rain is always a possibility in the St. Louis area, but September tends to bring fewer storms than midsummer. Short, passing showers or isolated thunderstorms may develop, especially in the afternoon, but they often move through quickly. Bringing a light rain jacket or poncho is a good idea to stay prepared for sudden changes in weather.

Winds are generally light to moderate, around 5–10 mph (8–16 km/h), though occasional gusts can occur during passing weather systems. Even though the race takes place in September, sun exposure can still be strong. Fans spending the day in the grandstands or Fan Zone should apply sunscreen regularly, wear sunglasses, and consider a hat to stay protected.

For the most reliable information, always check a trusted weather forecast in the days leading up to the event. Live weather apps such as Windy can help you track rain cells and wind patterns as race weekend approaches.