Highest temperature in Seoul on July 27?

Platform comparison

Market context

The contract turns on the **highest temperature recorded at Incheon International Airport Station on 27 July 2026**, so the key question is whether the day reaches a typical Seoul-summer high or gets held down by rain and cloud. Current public forecasts point to **showers in the capital region from the morning**, with Seoul expected to sit around **26–33°C** and daytime highs in the region broadly in the **high 20s to mid-30s** range, which makes the current **0% YES** reading look extreme rather than anchored in the weather outlook.[1]

Historically, Seoul in July usually runs hot and humid, with average highs around **30°C** and frequent rain, so the market is not pricing an unusual thermal event so much as asking whether the day clears the threshold in the contract’s specific temperature banding.[3][5] The present setup looks more consistent with a normal monsoon-season range than with a cold anomaly, which matters because a single warm break between showers can still push the day’s maximum towards the upper 20s or low 30s.[1][3]

For traders, the main catalysts are the **morning update cycle**, any shift in the rain timing, and whether the capital region gets enough cloud cover to cap the midday peak. Because settlement is tied to a specific airport station and the result is sourced from **Wunderground**, the last material inputs are local temperature observations rather than broader Seoul forecasts, so the path from “regional high” to “market-winning reading” depends on the exact station print during the daylight window.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.