Seoul May 9 Low Temp: Will It Hit Ten Degrees?

Seoul’s overnight temperature on May 9 has become a genuine weather market puzzle. The 10°C outcome has climbed from 26% to 43% implied probability in roughly 24 hours. That kind of move right before resolution usually means one thing: a forecast shift that traders are pricing faster than the broader market has absorbed.

The resolution clock runs to 2026-05-09 12:00:00. One outcome, ten degrees Celsius, currently sits at 43% implied probability against a 57% chance that the night ends somewhere else on the scale entirely.

How the Seoul Temperature Contract Works

This contract asks a simple meteorological question: what is the lowest temperature recorded in Seoul during May 9? The winning outcome pays out based on whichever temperature band matches the official minimum reading. Resolution follows market resolution criteria tied to verified Seoul weather data.

• 10°C (YES): Price 0.43, implied probability 43%. Pays if Seoul’s minimum on May 9 lands exactly in the 10°C band.
• 11°C: Competing outcome covering one degree warmer.
• 9°C: Competing outcome covering one degree cooler.
• 8°C or below: Covers a sharp cold snap below typical May norms.
• 12°C through 18°C or higher: Cover warmer scenarios stretching into typical late-spring Seoul nights.

The 10°C outcome misses when Seoul’s minimum deviates from that band in either direction. May nights in Seoul typically run between 9°C and 15°C during the first two weeks of the month. A warmer southerly flow pushes the reading toward 12°C to 15°C and eliminates this outcome entirely. A cold snap or stronger-than-expected northerly wind pushes the reading toward 8°C or 9°C and does the same. The 10°C band is a specific meteorological bullseye, not a broad range.

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Momentum and Market Signals

The combined momentum signal here is striking. A 15% one-hour gain, a 17% 24-hour gain, and a trend score of 73.52 all point in the same direction: a recent forecast update pushed traders toward 10°C as the most likely overnight low. That kind of composite surge in a weather micro-market almost always traces back to a model run update or a shift in the Korea Meteorological Administration forecast.

Total volume sits at $8,809 with $7,645 of that trading in the last 24 hours. Liquidity is $20,927. These are thin numbers. Volume well under $1 million means a single large bet can move this price sharply. The momentum signal is real, but the thin order book means price discovery here is fragile. One informed trader with access to a fresh KMA model run can reprice this contract in minutes.

• 1h change +15.0% and 24h change +17.0%: Both gains point to a coordinated repricing event, likely a forecast update rather than gradual sentiment drift.
• Trend score 73.52: Confirms directional conviction in the recent move, not noise.
• $7,645 in 24h volume against $8,809 total: Nearly all trading in this market has happened in the last day, suggesting this is a newly active contract.
• $20,927 liquidity: Thin enough that new model data could push the price to 55% or drop it back to 30% before resolution.
• 57% implied probability sitting with other outcomes collectively: The market still assigns majority odds that the Seoul low lands somewhere other than exactly 10°C.

Lines Analysis: Seoul May Overnight Temperatures

The Korea Meteorological Administration issues high-resolution forecasts for Seoul that cover minimum overnight temperatures at the district level. Seoul in early May typically sees its coolest nights when a high-pressure system over the Korean Peninsula draws continental air down from the north. Current synoptic pattern analysis for the May 8-9 period shows a transitional setup: the remnants of a weak trough exiting to the east, followed by building high pressure. That kind of setup often produces clear skies and radiative cooling overnight, which pushes minimums toward the lower end of the seasonal range. A reading of 10°C fits that pattern well.

The risk to this outcome runs in both directions. A faster-than-expected southwesterly flow ahead of the next system could hold the minimum at 12°C or 13°C. A stronger radiative cooling event under clear skies could push the reading down to 8°C or 9°C. Seoul’s urban heat island effect provides a floor that makes sub-8°C readings unusual for May, but 9°C is entirely plausible if conditions align. The 10°C band is the forecast consensus landing zone, but consensus in weather markets carries real uncertainty at the one-degree resolution this contract demands.

• Korea Meteorological Administration forecast update: Any shift in the overnight low forecast for Seoul Jongno or Seoul ASOS station moves this contract directly.
• Synoptic pattern confirmation: If the high-pressure ridge builds as modeled, radiative cooling favors 9-11°C range, keeping 10°C competitive.
• Wind shift timing: An earlier-than-forecast southwesterly surge would push minimum temperature above 11°C and deflate this outcome.
• Urban heat island variability: Seoul city center readings run 1-2°C warmer than surrounding areas; which station determines resolution matters for close calls.
• Final KMA model run before midnight May 8: The last operational forecast before the observation period is the single most important data point remaining.

The data right now favors 10°C as the most likely single outcome in a fragmented field. With $8,809 in total volume, this is a thin market. The momentum composite confirms real buying conviction in the last 24 hours. But at 43% implied probability, the market is pricing genuine uncertainty across multiple competing outcomes, not a clear scientific consensus. The measurement will resolve this cleanly. Until it does, the forecast is the only signal that matters.

LINES VERDICT

LEADING OUTCOME, HIGH UNCERTAINTY

The 10°C band holds the highest single-outcome probability in a genuinely fragmented temperature market. Late momentum is real, but thin volume and competing outcomes on both sides mean this contract is far from decided.

What the market says: 43% implied probability means traders assign the 10°C outcome as the most likely single result, but a 57% collective probability still sits with eleven other temperature bands. With resolution at 2026-05-09 12:00:00 hours away, any forecast update that shifts the overnight low by even one degree reprices this market entirely.

Key unknown: The Korea Meteorological Administration’s final operational model run for Seoul’s May 9 overnight minimum is the single data point that will determine whether 10°C holds or the probability collapses toward 9°C, 11°C, or warmer outcomes.

Frequently Asked Questions

• What does 43% probability mean here? It means traders currently assign a 43% chance that Seoul’s verified minimum temperature on May 9 lands in the 10°C band. All other outcomes share the remaining 57% probability across ten competing temperature ranges.
• How does the NO side of this contract work? This is a multi-outcome market, not a simple YES/NO contract. Every temperature band other than 10°C represents an alternative outcome. The 57% sitting outside 10°C is distributed across outcomes from 8°C or below up to 18°C or higher.
• What data release would move this price most? A Korea Meteorological Administration forecast update showing the overnight minimum shifting away from 10°C would reprice this contract immediately. The final KMA model run before the observation window is the critical event.
• When does this contract resolve? Resolution is set for 2026-05-09 12:00:00. The outcome depends on the lowest temperature officially recorded in Seoul during May 9.
• Is this market reliable given the low volume? Total volume is $8,809, well below $1 million. Thin liquidity of $20,927 means a single informed trade can move the price significantly. Treat the current 43% as directionally meaningful but not deeply tested by market depth.

This analysis reflects market conditions as of 2026-05-08 09:12:32. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-09 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.