Highest temperature in Seoul (Incheon) on August 4?

Platform comparison

Market context

Seoul’s airport temperature for 4 August is sitting in a late-summer heatwave setup, with forecasters calling for highs around 37–38°C across the capital area and an official severe heat warning in force from 11:00 AM local time. That is materially above the usual August pattern, where Seoul’s monthly average high is roughly 84°F/29°C and typical daily highs cluster in the low 30s Celsius rather than the high 30s.[1][2][3][4]

Historically, this kind of contract usually resolves around whether the day can actually print at the upper end of the forecast envelope, not whether the afternoon feels extreme. August in Seoul is normally hot and humid, with rain still common, but the more relevant comparison is that published seasonal references put the city’s August record high at about 38.2°C, so a settlement above the highest range bands is possible but not routine.[14][16][18] With the market priced at 0% YES, the crowd is effectively discounting a qualifying reading, which looks aggressive against the current forecast and warning language.[2][3][4]

The key catalysts are the Korea Meteorological Administration’s short-range updates, the timing of peak heating before cloud cover or showers arrive, and any localised thunderstorm or rain band that caps the airport station reading. SBS and other local coverage noted scattered showers later in the day, but not enough to blunt the heat immediately, while Incheon itself is forecast slightly cooler than Seoul, around 37°C at the daily maximum.[2][3] For a USDC-settled on-chain market, the practical issue is whether the terminal print lands inside the contract’s temperature band at Incheon Intl Airport Station before the settlement window closes, with the move likely driven more by the official station observation than by broader Seoul headlines.[3][8]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Seoul (Incheon) on August 4? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

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.

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.

How volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

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.