Seoul Low Temperature May 5: Market Locks In Eight Degrees

The 8°C outcome for Seoul’s minimum temperature on May 5 is trading at 96 cents on the dollar. That is not a close market. Traders have effectively closed the book on any other temperature band, with the 4.1-cent NO price reflecting only residual uncertainty around a forecast that has hardened into near-certainty over the past 24 hours.

This market resolves at 2026-05-05 12:00:00 KST. The question is straightforward: does Seoul’s lowest recorded temperature on May 5 land at exactly 8°C? The implied probability sits at 95.9%, the highest it has reached in this contract’s life.

How the Eight-Degree Contract Works

The market asks whether Seoul’s minimum temperature on May 5 registers at 8°C. Eleven outcome bands compete, ranging from 6°C or below up to 16°C or higher. The 8°C band has captured nearly all the capital. Resolution depends on the official minimum temperature reading for Seoul on that date.

• 8°C (YES): Priced at $0.96, implying 95.9% probability. This is the dominant position.
• All other outcomes (NO): Priced at $0.04 combined, implying 4.1% probability across ten remaining bands.

For NO to pay out, Seoul’s minimum temperature must fall outside the 8°C band entirely. That means the overnight low lands at 7°C, 9°C, or any other competing outcome. Weather models would need to diverge from current consensus by a meaningful margin. Short-range forecasts for Seoul on May 5 are pointing firmly at 8°C, which explains why capital has concentrated so heavily in one band.

Momentum and Market Signals

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The momentum composite here is striking. The 1-hour change of +47.4%, the 24-hour change of +57.4%, and a trend score of 84.20 combine into a single directional signal: traders updated their positions sharply after short-range weather model runs tightened around the 8°C forecast. That kind of price acceleration in a weather market almost always traces back to a forecast update, not sentiment drift.

Total volume is $25,165. The 24-hour volume of $22,732 means nearly all trading in this contract happened in the last day, concentrated around the forecast update that pushed the price from 61 cents at market open to 96 cents now. Liquidity sits at $16,755. Volume below $1 million means this market can reprice sharply if new model data contradicts the current forecast. A single cold air mass nudging the overnight low to 7°C would collapse the YES price quickly.

Key Factors

• The 1-hour and 24-hour momentum composite (+47.4%/+57.4%, score 84.20) reflects a single catalyst: short-range forecast convergence around 8°C for Seoul’s May 5 overnight minimum.
• Open interest is zero, meaning all positions are currently held with no outstanding unmatched orders, which confirms the market has reached a temporary equilibrium.
• Thin liquidity ($16,755) means the YES price is vulnerable to sudden moves if any forecast model shifts the overnight low estimate by even one degree.
• The 30-day low of 0.34 shows this contract was genuinely uncertain two weeks ago. The convergence to 0.96 reflects improving forecast skill as the resolution date closes in.
• Seoul’s May climate sits in a transitional zone. Overnight lows in early May typically range between 7°C and 12°C, making the 8°C band meteorologically plausible but not the only reasonable outcome.

Lines Analysis: Seoul’s Overnight Low

Short-range numerical weather prediction for Seoul on May 5 is the primary driver here. When models running at 12 to 48 hours lead time converge on a single temperature band, prediction markets for point weather outcomes behave like this one: capital concentrates fast and price approaches the theoretical ceiling. The Korea Meteorological Administration issues official temperature readings for Seoul, and those readings serve as the resolution anchor. Current model consensus has Seoul’s minimum at 8°C, which is why 95.9% of market probability sits in that single band.

The genuine risk lives in forecast uncertainty at the margins. Seoul’s overnight minimum on any given spring night can shift by one to two degrees based on cloud cover, wind direction, and timing of a cold air mass passage. A colder-than-expected night that bottoms out at 7°C moves all the probability to a competing outcome instantly. The 4.1% priced into NO is not noise. It represents the irreducible meteorological uncertainty that even a 96-hour forecast cannot eliminate with 24 hours remaining.

Signals to Monitor

• Korea Meteorological Administration short-range forecast updates for Seoul overnight on May 4 to 5 will be the most direct signal.
• Any upper-level cold air intrusion from the northwest, common in Korean Peninsula spring, could push the overnight low to 7°C and reprice this market sharply.
• Global model consensus (GFS, ECMWF) for Seoul surface temperature on May 5 morning should be tracked for divergence from the current 8°C consensus.
• Cloud cover forecasts matter: a clear night increases radiative cooling and raises the chance of the low falling to 7°C rather than holding at 8°C.
• The resolution timestamp of 2026-05-05 12:00:00 means the overnight minimum will be recorded well before resolution. Any late-night cold snap registers immediately in official Seoul data.

The $25,165 in total volume and the 95.9% price reflect a market that has absorbed the available forecast information and reached a strong consensus. The data favors YES. The only realistic path to a different outcome is a last-minute meteorological surprise that current models are not capturing.

LINES VERDICT

Market Settled, One Forecast Surprise Remains

The market has done its job: it has priced Seoul’s May 5 overnight low at 8°C with near-certainty, reflecting short-range forecast convergence in the final 24 hours before resolution.

What the market says: At 95.9%, traders have concluded this is essentially resolved. The only meaningful volatility window before 2026-05-05 12:00:00 is a late-model update showing a colder overnight low.

Key unknown: The Korea Meteorological Administration’s next short-range forecast update for Seoul’s May 5 morning low is the single data point that could reprice this contract. If that update shifts the consensus from 8°C to 7°C, the YES price collapses.

Frequently Asked Questions

• What does 95.9% probability mean here? Traders are pricing roughly a 96-in-100 chance that Seoul’s official minimum temperature on May 5 lands at exactly 8°C. It reflects current short-range forecast consensus, not a guarantee.
• What does the NO side represent? The 4.1% priced into NO covers all other temperature outcomes: 7°C, 9°C, 6°C or below, and every band up to 16°C or higher. Any of those outcomes pays out the NO position.
• What single event would move this price most? A Korea Meteorological Administration or major global model update shifting the Seoul May 5 overnight low estimate from 8°C to 7°C or 9°C would immediately reprice the YES position downward.
• When does this contract resolve? Resolution is set for 2026-05-05 12:00:00. Seoul’s overnight minimum will be officially recorded before that time, so the outcome is effectively known at daybreak on May 5.
• Is the volume reliable here? Total volume is $25,165, well below $1 million. Thin liquidity means a small number of trades can move the price sharply. Treat the 95.9% price as directionally accurate but potentially volatile in the final hours.

This analysis reflects market conditions as of 2026-05-04 13:13:10. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-05 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.