Predicting the highest temperature of a specific city on a specific date is a niche but relatively standard type of prediction market (weather derivatives). While it lacks the broad public appeal of political elections or sports, it is not an entirely bizarre or unprecedented concept.

Between April 3 and April 4, 2026, the price of the 16°C option dropped from 30c to 10.5c before rebounding to 23c, due to upward revisions in weather forecast models prompting capital shifts to warmer options, followed by a slight reversal. Between April 3 and April 4, 2026, the 19°C option experienced high volatility, fluctuating between 10.5c and 35c, as updated forecasts strongly supported a 19°C high, causing aggressive repricing. Between April 3 and April 4, 2026, the 15°C option plummeted from 29c to 9.5c, as the latest meteorological consensus ruled out such a low maximum temperature, destroying its implied probability.

Mainstream weather platforms (like AccuWeather and Weather25) explicitly forecast a high of 19°C (66°F) for April 5. However, the prediction market still allocates significant probability (over 70% combined) to 16°C, 17°C, and 18°C. This divergence likely stems from an anchoring effect to earlier, colder forecasts or traders pricing in micro-climate variations specific to the Gimhae Airport weather station.