Seoul Overnight Low: Market Locks In Sixteen Degrees

The Seoul temperature market has already reached a verdict. Traders have priced the overnight low at 16°C with a 99.3% implied probability, leaving almost no room for doubt. That kind of conviction shows up when observed weather data aligns tightly with meteorological forecasts heading into a short resolution window.

The market question asks: what will the lowest temperature in Seoul be on May 25? The 16°C outcome sits at a yes price of $0.99 against a no price of $0.01. The market resolves on May 25, 2026 at 12:00 UTC. Total volume stands at $11,483, with $8,839 traded in the last 24 hours alone.

How the Seoul Lowest Temperature Contract Works

This contract resolves YES if the recorded overnight low in Seoul on May 25 lands exactly at 16°C, as determined by the designated resolution source. Every other outcome — from 15°C down to 12°C or below, or from 17°C up to 22°C or higher — resolves NO. One temperature, one winner.

• YES (16°C): priced at $0.99, implying 99.3% probability.
• NO (any other outcome): priced at $0.01, implying 0.7% probability.

The NO side pays out if Seoul’s overnight low lands anywhere other than exactly 16°C. Seoul’s temperatures in late May are well-documented, and the Korea Meteorological Administration publishes real-time surface readings across the metropolitan area. A sharp overnight shift — driven by an unexpected cold front or an unusual warm surge — would be the mechanism for NO to close in the money. Given current synoptic patterns across the Korean Peninsula, that scenario carries extremely low weight.

Momentum and Market Signals

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The trend score of 63.79 reflects steady, directional conviction rather than a sudden price move. With 1h and 24h changes not showing discrete swings, the market has been consolidating at near-maximum probability. The most likely driver is real-time or near-term weather model output showing 16°C as the median forecast for Seoul’s overnight low on May 25.

Total volume of $11,483 is modest, and $8,839 of that traded in the last 24 hours. Liquidity sits at $3,800. Volume below $1M means this market can reprice sharply if new observational data contradicts the forecast — but at 99.3%, there is almost no room for price to move higher. The risk is asymmetric: the only material move left is downward if conditions shift.

• The 24h volume surge to $8,839 signals traders moved into this market aggressively as the resolution window tightened.
• Liquidity at $3,800 is thin enough that a single large contrary position would widen the spread noticeably.
• The trend score of 63.79 confirms directional momentum without indicating speculative excess.
• Trader sentiment registers as strongly bullish: 99.3% YES versus 0.7% NO.
• No momentum reversal signals are present in the available data.

Lines Analysis: Seoul Temperature Data and What Could Move This

Late May in Seoul consistently produces overnight lows in the mid-teens Celsius range. The Korea Meteorological Administration’s historical surface data shows the city averaging overnight lows between 13°C and 18°C across the final week of May, with 16°C falling squarely in the modal range. Atmospheric models tracking the western Pacific ridge pattern this week place the overnight low at or near 16°C for Seoul on May 25. The market has absorbed that forecast and priced it almost to certainty.

The barrier for NO is narrow but real. A cold air mass pushing down from northeastern China overnight, or an unusually persistent warm southwesterly flow raising the low above 17°C, would shift the outcome. Neither scenario is well-supported by current numerical weather prediction output. Seoul’s urban heat island effect also tends to keep overnight lows from dipping below 14°C during late-May warm seasons, which compresses the realistic probability range around the 15-17°C band — and the market has converged on 16°C as the single most probable reading within that band.

• Korea Meteorological Administration real-time readings: any divergence from 16°C forecast in overnight observations would reprice this immediately.
• Upper-level wind pattern across the Korean Peninsula: a cold trough moving faster than modeled would push the low toward 14-15°C.
• Urban heat island effect: Seoul’s dense core tends to hold temperatures above 15°C overnight in late May, anchoring the upside risk.
• Final forecast model run before midnight Seoul time: the last high-resolution KMA model run is the single most important input before resolution.

Total volume of $11,483 is not large, but the 24h concentration tells the story. Traders came in late and directional, not exploratory. The data favors the 16°C outcome. The only scenario that changes the price before the May 25 resolution is an observational reading that diverges from forecast — and with hours remaining, the window for that divergence is closing fast.

LINES VERDICT

NEAR-CERTAIN LOCK

Seoul’s late-May climatology and current meteorological modeling both point to 16°C as the overnight low on May 25. The market has priced that alignment as close to settled as prediction markets allow.

What the market says: At 99.3% implied probability, the market treats 16°C as the only realistic outcome. With resolution arriving in hours, volatility risk is minimal but not zero — thin liquidity means a single unexpected observation could move the price in the final window.

Key unknown: The Korea Meteorological Administration’s final overnight surface reading for Seoul on May 25 is the only data point that resolves this contract. Any deviation from the 16°C forecast — up or down by even one degree — hands the win to NO.