Seoul April 25 Low Temperature: Will It Hit Nine Degrees?

Seoul’s overnight low on April 25 is one of the most precisely bounded prediction markets running right now. The contract asks a simple meteorological question: will the lowest recorded temperature in Seoul land at exactly 9 degrees Celsius? Traders have answered with unusual conviction. The market sits at 89% implied probability, and it got there fast, moving more than 55% in the last 24 hours alone.

That kind of momentum on a short-duration weather market is worth paying attention to. This contract resolves at 2026-04-25 12:00:00, less than 24 hours from now. Whatever Seoul’s weather stations record overnight, this market closes quickly. The data doesn’t care about the politics, and in this case, there’s no politics anyway. There’s just a thermometer.

How the Seoul Temperature Contract Works

The contract resolves YES if the lowest temperature recorded in Seoul on April 25 equals exactly 9 degrees Celsius. Resolution is based on official meteorological measurement. Alternative outcomes include 8°C or below, 10°C, 11°C, and a range of higher readings up to 18°C or above. Only one outcome pays.

• YES (9°C low): priced at 0.89, implying an 89% probability.
• NO (any other outcome): priced at 0.11, implying an 11% probability.

Missing the 9°C mark by even a single degree sends this contract to zero. Seoul’s Korea Meteorological Administration records temperatures continuously. If the overnight low comes in at 8°C or 10°C, the YES position pays nothing. A one-degree window is narrow. The market is pricing that window as nearly certain.

Momentum and Market Signals

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The momentum composite here is striking. A 34% move in the last hour, a 55.5% move over 24 hours, and a trend score of 84.74 combine into a single directional signal: traders received new information and moved hard toward YES. The most likely driver is updated numerical weather prediction data. Short-range forecasts from models like the Korea Meteorological Administration’s regional guidance or global ensemble runs would have sharpened overnight low estimates for Seoul in the last 12 to 18 hours. That kind of precision update is exactly what triggers a price jump in a narrow-band temperature contract.

Total volume sits at $17,636, with $14,753 trading in the last 24 hours. Liquidity stands at $18,375. These are small absolute numbers. Volume below $1 million means a single well-timed trade can move this price sharply. The 89% reading reflects genuine conviction from the traders who are in this market, but thin liquidity means a new forecast showing a different low could reprice this quickly. The order book is not deep enough to absorb surprise.

• 1h change (+34.0%) and 24h change (+55.5%): both signal a recent, decisive information event, most likely a short-range forecast update narrowing the overnight low estimate toward 9°C.
• Trend score (84.74): confirms sustained directional pressure, not a single spike.
• $14,753 in 24h volume: meaningful relative to total market size, but thin in absolute terms. New forecast data could move price before resolution.
• Liquidity at $18,375: slightly above total volume, meaning the order book has capacity, but not deep protection against a sharp revision.
• Open interest at $0: all active positions are already reflected in current pricing.

Lines Analysis: Seoul and the Nine-Degree Window

Here’s what the measurements are telling us. Short-range numerical weather prediction is highly reliable within 24 hours, especially for a well-instrumented urban station like Seoul. The Korea Meteorological Administration operates dense observation networks across the metropolitan area. When late-model guidance converges on a specific overnight low, the probability of landing within one degree of that estimate is genuinely high. The 89% price reflects that meteorological reality. Late April in Seoul typically sits in a transitional regime where overnight lows cluster between 7°C and 13°C, and the current synoptic pattern appears to be pointing toward the lower end of that range.

What makes the 11% NO position real is measurement variance and model uncertainty. Urban heat island effects can push Seoul station readings slightly above surrounding rural estimates. A cold air drainage event, a cloudier-than-forecast night, or a later-than-expected cold front passage could shift the actual low by a degree. A 10°C reading is the most plausible alternate outcome given the current setup. An 8°C or colder night would require a stronger cold surge than current guidance suggests.

• Korea Meteorological Administration final overnight observation for April 25 is the single resolution trigger.
• Any updated short-range forecast showing a low of 10°C rather than 9°C would push the NO side and reprice this contract before close.
• Global ensemble model agreement, particularly ECMWF and GFS convergence on 9°C, supports the current 89% level.
• Cloud cover and wind speed through the overnight hours are the physical variables most likely to shift the final reading by one degree.
• Resolution at 2026-04-25 12:00:00 means the measurement window closes before the Seoul morning warming cycle fully sets in.

The market is pricing uncertainty, not science. At $17,636 total volume, this is a small, sharp market where a single forecast update matters. The data currently favor YES. The 11% assigned to other outcomes is doing real work, accounting for genuine meteorological variance in a narrow one-degree band. That’s a reasonable spread for this kind of contract.

LINES VERDICT

Meteorological Conviction, Thin Market

The 89% probability reflects genuinely strong short-range forecast convergence on a 9°C overnight low in Seoul. The thin liquidity means any forecast revision in the next few hours would move this price sharply before the 2026-04-25 12:00:00 close.

What the market says: 89% probability means traders have priced this outcome as nearly certain. The overnight window is short, the forecast signal is strong, and the momentum is one-directional. Volatility remains possible until the Korea Meteorological Administration publishes the final overnight low before the resolution deadline.

Key unknown: The single most important factor is whether updated short-range model guidance in the next 6 to 12 hours confirms or revises the overnight low estimate. A one-degree shift in the forecast would immediately reprice this contract.

Scientific Context

Late April overnight lows in Seoul typically range from 7°C to 14°C, depending on synoptic flow and cloud cover. The city’s urban heat island effect tends to keep station readings slightly warmer than surrounding terrain, particularly on calm, clear nights when radiative cooling is strongest in rural areas. Short-range forecast accuracy for overnight lows at major urban stations like Seoul is generally within one to two degrees at the 24-hour range, which is why the market’s one-degree precision band carries meaningful uncertainty even at high probability. The current 89% pricing accounts for that residual uncertainty appropriately.

Frequently Asked Questions

• What does 89% probability mean here? It means traders collectively estimate a roughly nine-in-ten chance the Seoul overnight low on April 25 lands at exactly 9°C. Prediction market probabilities shift as new forecast data arrives.
• What happens to the NO position? If the Korea Meteorological Administration records any temperature other than 9°C as the overnight low, every alternative outcome contract for that temperature pays out. The YES contract at 9°C pays nothing.
• What data event would move this price before resolution? An updated short-range weather forecast showing the overnight low shifting to 8°C or 10°C would immediately reprice the 9°C YES contract. Model guidance updates in the 6 to 18 hours before resolution are the key signal to watch.
• When does this market resolve? The contract closes at 2026-04-25 12:00:00. Resolution depends on the official overnight low recorded by Seoul’s meteorological station for the full April 25 observation window.
• Is the volume reliable here? Total volume of $17,636 is thin. Liquidity at $18,375 means the order book has limited depth. A single large trade or a sharp forecast revision could move the price significantly before the market closes.

This analysis reflects market conditions as of 2026-04-24 15:12:53. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-04-25 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.