Highest temperature in Seoul on May 28?

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Market context

Seoul's maximum temperature on 28 May 2026 will be recorded at Incheon International Airport's weather station and settled against Wunderground historical data. The settlement window closes at 12:00 UTC that day, creating a hard deadline for resolution. USDC settlement follows standard on-chain mechanics once the highest daily temperature is confirmed and falls within one of the predefined ranges.

Late May in Seoul typically sits within the 22–28°C range, with occasional spikes into the low 30s during early heat waves. Historical data from the past decade shows 28 May temperatures clustering around 24–26°C on average, though 2018 recorded 29.4°C and 2015 reached 30.1°C. The 0% crowd probability currently assigned suggests traders are pricing in either extreme confidence in moderate conditions or minimal liquidity at present. Comparable spring-to-early-summer transitions in East Asia show high variance; Seoul's May weather can shift sharply depending on whether subtropical air masses push northward ahead of the monsoon season.

Traders should monitor the Korean Meteorological Administration's extended forecasts from mid-May onwards, as these typically carry 10–14 day accuracy for maximum temperature ranges. Any significant ridge of high pressure developing over the Korean Peninsula in the fortnight before settlement would be the primary catalyst for elevated temperatures. Tropical cyclone activity in the Western Pacific during late May could alternatively suppress temperatures through cloud cover and moisture advection, though such systems rarely impact Seoul directly before June.

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 — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

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

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on BTC Prediction?

Zero. BTC Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.