Highest temperature in Seoul on July 7?

Platform comparison

Market context

Seoul’s highest temperature on 7 July 2026 will be measured at Incheon International Airport, with Wunderground as the official resolution source. The current crowd-implied probability of 0% YES suggests the market expects the temperature to fall outside the specified range, likely due to prevailing monsoon conditions that typically suppress peak heat in early July.

Historically, Seoul’s July daytime maximums average 28°C, with humidity pushing felt temperatures above 34°C, but actual recorded highs rarely exceed 30°C during the rainy season [1][2]. The highest early-July temperature ever recorded in Seoul was 37.8°C on 8 July in a previous year, an outlier driven by extreme heat rather than typical monsoon weather [10]. This anomaly frames the current 0% probability as a rational bet against such extremes recurring under normal climatic conditions.

Traders should monitor the Korea Meteorological Administration’s short-range forecasts for precipitation intensity and temperature feels, as heavy rainfall and high humidity are expected to dominate central inland cities like Seoul [2][4]. The Sinchon Water Gun Festival in late July may influence local microclimates, but its timing is after the settlement window, making it irrelevant to this contract [2]. With BTC and ETH macro volatility potentially affecting USDC liquidity, on-chain settlement mechanics could introduce slippage if whale flows shift funding rates sharply before 2026-07-07T12:00:00Z.

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.

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

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.

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.