Seoul April 2 High Temp: Market Dumps Thirteen Degrees

Something shifted in Seoul’s weather forecast overnight, and the prediction market for April 2’s peak temperature felt it immediately. The contract on 13°C hitting as the day’s high dropped 25.5% in 24 hours. That’s not noise. That’s traders repricing on new information.

The 13°C outcome now sits at 24.5% implied probability, down from 50% at market open. With resolution set for April 2, 2026, and $93,576 traded in total, the market is sending a clear directional signal: Seoul probably lands somewhere other than 13°C tomorrow.

How the Seoul Temperature Contract Works

This contract resolves YES if Seoul’s highest recorded temperature on April 2, 2026 hits exactly 13°C. The resolution source is Polymarket’s designated weather data provider. The competing outcomes cover the full realistic range from 6°C or below through 16°C or higher, with each degree bracket as a separate tradeable contract.

• YES: Seoul’s April 2 high reaches exactly 13°C. Price: $0.25. Probability: 24.5%. Resolves: April 2, 2026.
• NO: Seoul’s April 2 high lands at any temperature other than 13°C. Price: $0.76. Probability: 75.5%. Resolves: April 2, 2026.

A NO buyer here is betting the actual high falls on a different bracket. With ten competing outcomes in this market, that’s a structurally reasonable bet even without strong directional conviction on which temperature wins. The NO buyer doesn’t need to know whether it lands at 12°C or 14°C. They just need to know it won’t be exactly 13°C. That asymmetry explains part of the bearish pressure on every individual bracket in a multi-outcome temperature market.

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Momentum and Market Signals

The momentum picture here is stark. A 25.5% drop in 24 hours, combined with a 28.5% single-day collapse on March 31, points to one likely driver: updated numerical weather prediction models. When forecast models shift a projected high by even one or two degrees, the correct bracket in a market like this can flip entirely. The market open price of $0.50 for 13°C suggests early traders gave this outcome a coin-flip shot. Something in the forecast data killed that conviction fast.

Total volume of $93,576 with $73,050 of that trading in the last 24 hours is notable for a single-day temperature contract. The $30,344 in available liquidity is thin. In a market this tight, a single updated forecast dropping on a major weather service can move price 10 to 15 points in minutes. Anyone sizing into this contract should treat that liquidity number as a hard constraint, not a footnote.

• 1-hour change: Price data shows continued bearish pressure on the 13°C bracket, consistent with a market trending toward resolution at a different temperature.
• 24-hour change: Down 25.5%, the sharpest single-session move this contract has seen, triggered most likely by a model update from KMA (Korea Meteorological Administration) or a global forecast service like ECMWF.
• Volume concentration: $73,050 of $93,576 total volume traded in the last 24 hours. Traders are engaged, not dormant. This is an active repricing, not a drift.
• Liquidity warning: $30,344 available is below the threshold where large positions move cleanly. Thin volume means the next data point, a forecast revision or an early temperature reading, could gap this price significantly.
• Competing outcomes: The 14°C and 12°C brackets are the natural beneficiaries if traders are rotating out of 13°C. Without seeing those prices, the direction of the rotation is the key unknown.

Seoul Temperature Forecast: Reading the Market Against the Data

Here’s what the measurements are telling us. Seoul in early April typically sees daily highs ranging from 10°C to 16°C, with the climatological mean around 13°C to 14°C. The 30-day high on this contract was $0.50, meaning traders originally treated 13°C as the modal outcome. The subsequent collapse to $0.25 suggests forecast models have shifted the projected high toward 14°C or higher, or possibly toward 12°C if a cold front is in the picture. The data doesn’t care about the politics, and it doesn’t care about what the market originally priced. It just keeps updating.

The case for NO is straightforward. With ten outcome buckets sharing probability across the full temperature range, any single bracket faces a baseline structural disadvantage. A 24.5% probability for one specific degree threshold is actually not far from random across ten outcomes. The real question is whether the market has already priced in the updated forecast correctly, or whether there is still 13°C probability to sell.

• KMA forecast update: Any revision to the April 2 Seoul high above 14°C or below 12°C would push 13°C probability toward 10% or lower.
• ECMWF model output: European Centre for Medium-Range Weather Forecasts runs updated ensemble runs every 12 hours. A shift in the ensemble mean would reprice all temperature brackets immediately.
• Early April 2 temperature readings: If Seoul’s morning low comes in significantly warmer or cooler than expected, that narrows the range of possible daily highs sharply.
• Wind and precipitation forecast: A rain event on April 2 typically suppresses the daily high. A dry, sunny day pushes it higher. Cloud cover forecasts matter here.
• Adjacent bracket prices: Watching the 12°C and 14°C contract prices would confirm where traders think the high is actually landing. Rising 14°C probability alongside falling 13°C is a coherent signal.

The market is pricing uncertainty, not science. With $93,576 in total conviction and resolution less than 24 hours away, this contract will either snap to near zero or recover toward 40% to 50% as forecast models converge on a final answer. The thin $30,344 liquidity pool means that convergence, when it comes, will move price sharply and fast.

LINES VERDICT

NO Favored: Thirteen Degrees Unlikely to Hit Exactly

The 25.5% single-session price collapse reflects a real forecast shift, not panic selling. In a ten-bracket temperature market, structural probability alone makes any single degree outcome a long shot, and the updated models appear to favor a different bracket entirely.

What the market says: A 24.5% probability means traders give 13°C roughly a one-in-four shot. With a single day to resolution and thin liquidity, that number can move to near zero or back toward 45% on a single forecast revision.

Key unknown: The next KMA or ECMWF model run before April 2 dawn is the pivotal data point. A forecast high landing firmly at 14°C or above would drain remaining 13°C probability to near zero within hours of publication.