The title asks for the highest temperature in Seoul, but the rules explicitly state resolution is based on the Incheon Intl Airport Station (RKSI). There is a geographical and climate difference between central Seoul and Incheon Airport, potentially trapping traders who only read the title. Additionally, temperatures are evaluated in whole degrees Celsius.

Betting on the exact highest temperature of a specific city on a random day is a niche and novelty topic in retail prediction markets. Average people do not typically care about or predict such precise daily weather metrics.

April 19, 2026 20:23 - April 20, 2026 09:23, the price of '15°C' skyrocketed from 35.5c to 99.85c, while '16°C' spiked to 35.5c before crashing to 0.1c, and '17°C or higher' plummeted to 0.05c. The reason is that real-time observation data on the resolution day confirmed the high temperature stalled at 15°C amidst rain, leading the market to fully price in the outcome. April 19, 2026 20:23 - April 20, 2026 01:55, the price of '16°C' surged from 13.5c to 35.5c, while '17°C or higher' plummeted from 34.5c to 11.5c. This is because real-time morning temperature data and short-term forecasts on the resolution day showed a mild warming trend, leaning towards peaking at 15-16°C and struggling to surpass 17°C. April 19, 2026 10:38 - April 19, 2026 17:08, the price of the '15°C' option surged from 24c to 36.5c, while '17°C or higher' plummeted from 28c to 11.5c. This was caused by the latest meteorological models closer to the resolution date ruling out extreme heat and pinpointing the expected temperature around 15°C. April 18, 2026 - April 19, 2026, the price of the '17°C or higher' option plummeted from 44.5c to 20.5c, and '16°C' dropped from 31.5c to 17.5c. This was caused by updated meteorological forecasts confirming spring rain on April 20, drastically reducing the likelihood of extreme heat at the coastal Incheon Airport.

Betting on the daily high temperature of a specific city is a common novelty market on prediction platforms. It is somewhat unusual compared to mainstream political or economic events, but not extremely bizarre.

April 18, 2026 - April 19, 2026, the price of the 21°C option dropped from 24c to 10.5c, while the 24°C option surged from 13c to 26.5c before settling at 20.5c. The 22°C option also briefly spiked to 41c. This volatility was driven by weather forecast model updates as the date approached, which ruled out lower temperatures and briefly projected a potential for a higher peak, before stabilizing around the 22°C-23°C range.

Predicting the precise highest temperature on a specific day for a specific city is a relatively niche weather market. While weather forecasting is common in daily life, trading on it remains somewhat novel to the general public.

From April 18, 2026, to April 19, 2026, the price of the 4°C option fluctuated from 0.205c up to 0.325c before settling at 0.245c, the 5°C option surged from 0.15c to 0.305c, and the 7°C option plunged from 0.16c to 0.0215c. The reason is that as the resolution date approaches, weather forecast models have converged, ruling out higher temperatures and confirming expectations for a cooler day (in the 4°C-6°C range).

Predicting the exact high temperature of a specific city on a particular day is a niche but standard 'weather' topic in prediction markets. Ordinary people do not typically forecast temperatures to the exact degree in daily life.

April 18, 2026 - April 19, 2026, the price of the 28°C option plummeted from 34.5c to 11.5c, and the 29°C option dropped from 22.5c to around 2.5c. Meanwhile, the 26°C option climbed from 20c to 37c. The reason is that as the resolution date approaches, weather forecast models have converged, ruling out extreme high temperatures and narrowing the expected temperature range to 26°C-27°C.