Polymarket lists markets for the highest temperature of the day in various cities — e.g. "Will the high in NYC today be 66–67°F?"

This tool looks for situations where it is late in the day and the temperature is already declining, meaning the daily peak has very likely already passed. If Polymarket still offers a No contract on a higher temperature bracket at a price that hasn't fully priced in this near-certainty, that's the opportunity.

Filters: hours left in the day · gap from current temp to bracket · gap rate (°C/hr needed) · available liquidity.