The current air temperature is 70.8 degrees Fahrenheit/27.7 degrees Celsius, and the current water temperature is 63.8 F/18.6 C. (Reported at 6:48 a.m. CT on 9/18)

Weather in Chicago in mid-September is typically cooler than most of the summer. The days are getting shorter as fall approaches with the sunset around 7 p.m. The sunrise is at 6:30 a.m. The average temperature in Chicago in mid-September ranges from between 75-77 degrees Fahrenheit (23-25 degrees Celsius) for the high and 56-58 degrees Fahrenheit (13-14 degrees Celsius) for the low. Average monthly precipitation in September is 3.86 inches (9.80cm). The recorded average of water temperature in Chicago in mid-September ranges from 60-65 degrees Fahrenheit (16-18 degrees Celsius).

It's important to be prepared for any race conditions you may face. This article outlines eight tips to handle swimming in cold water, and may be a good resource for you as we approach race day.

We strongly recommend packing a wetsuit. If you need a wetsuit for the race, Urban TriGear will be providing wetsuit sales and rentals for TYR Sport at the event. They will be on-site or you can contact them before to secure your wetsuit at one of their two retail locations in Westmont, Illinois: 804 East Ogden Ave., 630-230-9386 and 842 East Ogden Ave, 630-468-2992.

*Please note that wetsuits are mandatory for swim familiarizations on Tuesday, Sept. 15, and all athletes must queue prior to entering the water as there is a maximum of 300 athletes allowed in the water at a time.

We have contingency plans in place for unexpected weather, and we will update participants with any new information via social media and email if and when appropriate. All participants should familiarize themselves with the Event Alert System prior to the event, remain alert for directions from race officials and announcers and take precautions to prepare properly for varying weather conditions on race day.