Traders on Polymarket have achieved significant profits by betting on daily temperatures in global cities, with weather prediction markets becoming one of the platform's fastest-growing sectors. Notably, a trader turned a $505 bet into $10,100 during the Karachi Heat event, replicating similar returns in Paris and Ankara. Another trader in Wellington transformed $186 into $6,630, with returns reaching up to 49,000% in cities like Lucknow and Atlanta. However, these lucrative trades have sparked controversy. On April 15, a temperature spike at Paris Charles de Gaulle Airport led to a $100 bet turning into $21,000, despite nearby stations showing no change. This anomaly prompted the French Meteorological Agency to file a criminal complaint, suspecting sensor tampering. In response, Polymarket replaced the Paris detection station with a more secure one at Le Bourget Airport. Despite the controversy, traders continue to profit by exploiting discrepancies between predictive models and market pricing.