Quest for 3:15 – Weather Forcast for Chicago Marathon Home » Blog » Running » Quest for 3:15 – Weather Forcast for Chicago Marathon IT KEEPS GETTING WORSE!!! High is now predicted to be 80 degrees!! At least it looks most of the race will be in the upper 60s and low 70s. Share this:EmailFacebookTwitterTumblr Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name* Email* Website Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email.