Trade: Highest temperature in Seoul on May 8?

Market context

On 8 May 2026, the highest temperature recorded at Incheon International Airport Station will determine which temperature range resolves this market. The settlement uses historical data from Weather Underground, capturing the daily maximum across all recorded times at this Seoul-area weather station. Currently, the order book on Polymarket shows 0% implied probability, indicating traders are pricing in an extremely low likelihood of the market resolving to whichever temperature range is being quoted at this moment.

Seoul's May climate typically sees daily highs between 22–28°C, with occasional warmer spells pushing toward 30°C. Historical May records at Incheon show temperatures have reached into the low 30s during heat waves, though such extremes remain uncommon for early May. The 0% probability on the order book suggests either the quoted range sits well above typical May conditions, or the market has attracted minimal liquidity, making the current price unreliable as a forecast signal. Traders should examine which specific temperature threshold this market is testing against historical May distributions.

Weather forecasting accuracy degrades significantly beyond ten days, making current seasonal patterns and atmospheric indices more relevant than specific forecasts. Late April and early May 2026 conditions will depend on whether high-pressure systems establish over the Korean peninsula, a pattern monitored through meteorological outlooks released by the Korea Meteorological Administration. The settlement window closes at midday on 8 May, so final temperature readings depend on morning and afternoon conditions rather than overnight lows.

Resolution source

This market settles from the official outcome published at https://www.wunderground.com/history/daily/kr/incheon/RKSI. A proposer submits the final result to the UMA optimistic oracle on Polygon; the two-hour dispute window closes and payouts clear in USDC.

How to trade this market step by step

The mechanics for trading "Highest temperature in Seoul on May 8?" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.

1. Sign in on polygram.ink with your email — no full KYC under $1,500 lifetime trading volume.
2. Deposit USDC on Polygon (lowest fees, ~$0.01 per transaction) or Ethereum. Funds credit after 12 confirmations.
3. Pick a side. Buy YES if you believe the event will happen; buy NO if you think it won't. The current YES price reflects the market's collective probability.
4. Size your position. If you stake 100 USDC at 50% YES, you'll receive shares that pay $200 if YES resolves true — a 100% gross return. If NO resolves, your shares are worth $0.
5. Set risk controls (optional). Stop-loss, take-profit, and limit-order types all supported. Use the trade ticket's slippage box to cap your maximum entry price.
6. Wait for resolution. When the event resolves on-chain via the UMA optimistic oracle, the winning side settles to 100¢ automatically and USDC hits your balance within seconds. Withdrawable to any wallet you control.

How active is this market?

$257K in lifetime turnover and $0 of resting liquidity puts this market in the top 10% by volume for weather contracts on PolyGram. Order-book depth is thin — large orders may need to be split across the book or executed as limit orders.

Last 24 hours alone saw $116K in turnover, well above the lifetime daily-average for this market — a clear sign of news catalysing trader activity right now.

The market has been open for under a month — fresh enough that information asymmetry remains a real factor.

Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.

Key terms

YES / NO share

A binary outcome token that pays $1.00 if the underlying claim resolves true (YES) or false (NO), and $0 otherwise. The market price between 0¢ and 100¢ is the implied probability.

CLOB

Central limit order book. The matching engine that pairs YES buyers with NO buyers (effectively the same trade). Polymarket's CLOB on Polygon executes trades on-chain via the conditional-tokens framework.

Liquidity

USDC capital sitting in resting limit orders inside the order book. Deeper liquidity means smaller slippage on large trades and a tighter bid-ask spread.

UMA optimistic oracle

The on-chain dispute system that settles each Polymarket market. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution.

Slippage

The difference between the displayed mid-price and your fill price. Affects market orders most; limit orders avoid slippage but may take time to fill.

Conditional token

ERC-1155 outcome share issued by Gnosis Conditional Tokens on Polygon. The token type that resolves to $1.00 or $0.00 at settlement.

See the full prediction-market glossary →

Frequently asked questions

Risk and regulatory note

Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.

Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.

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