Mild 53°F temps at gun time mean comfortable early miles without overheating risk. Temperatures rising to 66°F through the course will gradually increase perceived effort in the second half. Light winds shouldn't be a major factor for pacing. Moderate humidity at 72% is worth noting for effort level, especially in later miles.
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The OneAmerica 500 Festival Mini-Marathon, which takes place in Indianapolis, Indiana, is the largest half marathon in the United States, and the seventh-largest running event in America. As of the 37th running in 2013, it had sold out the entire running field of 35,000 for twelve consecutive years.Wikipedia
