Seoul May 12 Low Temp: Will It Hit Fourteen Degrees?

Seoul’s minimum temperature on May 12 has become the center of a fast-moving prediction market. The 14°C outcome now carries a 64.5% implied probability, up sharply from 22% at open. That kind of move in under 48 hours is not noise. Something in the meteorological data shifted trader conviction hard.

Here’s what the measurements are telling us: Seoul sits in a transitional weather window in mid-May. The Korean Meteorological Administration tracks daily temperature ranges across the peninsula, and May minimums in Seoul typically cluster between 12°C and 16°C during this period. The market is pricing 14°C as the most likely floor for May 12, with 13°C and 15°C as the closest alternatives.

How the Seoul May 12 Temperature Contract Works

This contract resolves on the observed lowest temperature recorded in Seoul on May 12, 2026, with resolution at 2026-05-12 12:00:00. The Korean Meteorological Administration’s official Seoul station data determines the outcome. Traders pick from a range of outcomes spanning 10°C or below through 20°C or higher. Only the outcome matching the recorded minimum pays out.

• 14°C (YES equivalent): Current price 0.65, implied probability 64.5%. Pays if the official Seoul minimum on May 12 lands exactly at 14°C.
• 13°C: Next closest alternative, pricing the possibility of a slightly cooler overnight.
• 15°C: Reflects the warmer-floor scenario, where a southerly flow keeps temperatures elevated.
• 12°C and below: Lower-probability outcomes requiring a meaningful cold intrusion from the north.

The 35.5% sitting outside 14°C covers a wide range of alternatives. For 14°C to miss, Seoul’s minimum would need to land at 13°C or 15°C, each carrying meaningful but lower probability. A cold front pushing overnight lows below 13°C, or persistent warm advection holding them at 15°C or above, are the two primary paths away from the favored outcome. The Korean Meteorological Administration’s forecast models currently show the boundary layer cooling into the mid-teens range overnight on May 11 into May 12, which is precisely what anchors 14°C as the modal outcome.

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Momentum and Market Signals Pointing Toward Conviction

The momentum composite here is striking. A 25% one-hour gain, a 37.5% 24-hour gain, and a trend score of 86.34 are moving together, not independently. That combination typically reflects a specific catalyst: a model run update, a revised forecast from the Korean Meteorological Administration, or a shift in synoptic pattern guidance that aligned trader expectations around a single outcome. The move from 22% at open to 64.5% now is not incremental. It is a repricing event.

Total volume stands at $10,356, with $7,081 traded in the last 24 hours. Liquidity is $3,082. Volume is below $1 million, which matters. At this size, a single large trade can move the price sharply. The current 64.5% reflects genuine directional conviction, but thin liquidity means the price is more sensitive to new forecast data than a deeper market would be. One updated model run showing a 15°C floor could shift this meaningfully before resolution.

• The 1-hour and 24-hour price changes together signal a single repricing event, not gradual drift. A meteorological catalyst is the most likely driver.
• The trend score of 86.34 places this market in strong momentum territory, consistent with a recent forecast convergence.
• Liquidity at $3,082 means thin order book depth. New data or a forecast revision could move price sharply in either direction before 2026-05-12 12:00:00.
• The 30-day low of 0.22 versus the current 0.65 shows the full range of uncertainty this market has traveled. The market has not always agreed on 14°C.
• Open interest at $0 suggests most positions are being actively traded rather than held passively, consistent with a short-duration weather market near resolution.

Lines Analysis: Seoul Temperature Forecast and Market Alignment

What supports 14°C is the current synoptic setup over the Korean Peninsula. Mid-May in Seoul typically brings surface temperatures that bottom out in the low-to-mid teens overnight, and the absence of a strong cold air mass from the north keeps the floor from dropping into the 12°C or below range. The Korean Meteorological Administration’s operational models have been showing overnight lows in the 13-15°C corridor for May 12, and 14°C sits at the center of that distribution. The market is not pricing a surprise. The market is pricing the modal forecast outcome.

The case for missing 14°C runs through two narrow corridors. A northerly wind surge from a departing trough could push the overnight minimum down to 13°C or even 12°C. Alternatively, a stronger-than-forecast warm sector holding through the night could keep the floor at 15°C. Neither scenario is dominant in current model guidance, but both remain meteorologically plausible within a 24-hour forecast window. The Korean Meteorological Administration’s evening forecast update for May 12 is the single most important data point remaining before resolution.

• Korean Meteorological Administration evening forecast update for May 12: a shift toward 13°C or 15°C would reprice this contract immediately.
• Upper-level trough timing: if the cold air arrives earlier than modeled, the overnight low moves below 14°C.
• Warm advection persistence: if southerly flow holds longer than forecast, the minimum stays at 15°C or above.
• International model consensus (GFS, ECMWF): agreement between global models on the 14°C floor strengthens conviction. Divergence weakens it.

Total market volume of $10,356 anchors this as a short-duration weather market with genuine directional conviction but limited depth. The data currently favors 14°C. The remaining uncertainty is almost entirely in the 12-18 hour forecast window before Seoul’s minimum temperature is recorded on May 12.

LINES VERDICT

Fourteen Degrees Has the Forecast Behind It

The Korean Meteorological Administration’s current guidance places Seoul’s May 12 overnight minimum squarely in 14°C territory, and the market’s sharp repricing reflects exactly that alignment. The data doesn’t care about the politics, and right now the data is pointing one direction.

What the market says: A 64.5% implied probability reflects strong but not certain conviction around 14°C as Seoul’s minimum on May 12. Given thin liquidity at $3,082, any forecast revision before 2026-05-12 12:00:00 could shift this price sharply.

Key unknown: The Korean Meteorological Administration’s final forecast update for the May 12 overnight period is the single remaining variable. A one-degree shift in the modeled minimum would reprice every outcome in this contract.

Scientific Context: Seoul’s May Temperature Range

Seoul’s climatological record shows May minimum temperatures averaging between 12°C and 16°C at the official station, with the distribution centering near 14°C during the second week of the month. The Korean Meteorological Administration maintains continuous surface observation records for Seoul, and mid-May typically marks the transition from spring cool nights to the warmer pre-monsoon period. The market’s current pricing at 14°C aligns closely with the climatological mean for this date, which partly explains the strong conviction. The market is not betting on an anomaly. The market is pricing the average. What would move price before 2026-05-12 12:00:00 is any forecast signal showing a departure from that climatological expectation, either a late cold surge or an early warm air mass holding temperatures above 14°C through the overnight hours.

Frequently Asked Questions

• What does 64.5% probability mean for this contract? The market assigns a 64.5% chance that Seoul’s official minimum temperature on May 12 lands exactly at 14°C, based on current trading prices set by Polymarket participants.
• What happens to positions if the low is 13°C or 15°C instead? Only the outcome matching the Korean Meteorological Administration’s recorded minimum pays out. A 13°C or 15°C result means 14°C contracts expire worthless.
• What data would move this price before resolution? A Korean Meteorological Administration forecast update shifting the projected overnight minimum by one degree in either direction would immediately reprice 14°C and its neighboring outcomes.
• When does this contract resolve? Resolution occurs at 2026-05-12 12:00:00, once the official Seoul minimum temperature for May 12 is confirmed by the resolution source.
• Is the market volume reliable enough to trust the price? Total volume is $10,356 with $3,082 in liquidity. Below $1 million in volume means the price is directionally meaningful but sensitive to single large trades. Treat the probability as a signal, not a certainty.

This analysis reflects market conditions as of 2026-05-11 21:12:10. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-12 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.