Today continues to look like a beautiful day at Belle Isle Park. There will be abundant sunshine and warm temperatures in the mid 70s. Admission is free today so get out and enjoy some great racing in perfect weather.
A cold front will be approaching Belle Isle from the north on Saturday, which will bring a chance of showers and thunderstorms. There could be showers in the area as early as the pre-sunrise hours of Saturday morning, but if these did occur they would be light and just wet the track a little. Scattered showers will be possible through the morning, but the chance of rain will be rising through the afternoon and evening, as will the threat of thunderstorms. This means that the IndyCar race, which is scheduled from 3:50 pm to 5:45 pm, will have the best chance of rain of Saturday's races. The exact timing of rain is too uncertain to say whether the race will be wet or dry at this time, but I would put the chance of at least part of the race being run in wet conditions at 40%. It is possible that rain could hold off until after the racing ends for the day, and I would put the chance of that happening at 60%.
With thunderstorms being possible on Saturday, fans at the track should stay weather aware, and have a plan to find shelter, preferably in a building, when thunder is heard.
Showers and thunderstorms are likely after sunset Saturday evening as the cold front moves through. High pressure will build in from the north on Sunday, providing cooler temperatures and low humidity. It will be a beautiful day to take in a race, with mostly sunny skies and highs in the mid 60s. It will be a little breezy, with a north wind at 10 to 15 mph.