Highest temperature in Seoul on May 22?

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Market context

The event is the day’s peak temperature at Incheon International Airport on 22 May 2026, resolved against the final Wunderground history entry in degrees Celsius. Incheon sits on the west coast and is typically a little cooler and more maritime than central Seoul, so a late-May high near the low-20s Celsius is a more natural reference point than the city-centre figures. Current May climatology for Seoul points to average highs rising through the month from about 21°C to 25°C, with occasional warmer spikes into the upper 20s °C when skies are clear and winds are light.

For context, the crowd-implied 0% YES looks consistent with a contract that only resolves into a narrower band if the airport reaches an unusually warm afternoon, but late spring in north-west South Korea can still produce brief surges when a continental high builds in. Historical May data for Seoul show that highs can jump sharply on isolated days, with recent records in the region reaching the upper 30s °C, though those are outliers rather than a base case. At Incheon, sea influence usually tempers extremes, so the most relevant comparison is whether the day stays in the low-to-mid 20s or pushes high enough to move the final reading into the next bracket.

The main catalysts are the local forecast cycle and whether afternoon sunshine persists through the airport’s onshore breeze. Traders should watch the final morning update from Korean meteorological services and the hourly evolution at Incheon, as late cloud cover or a sea breeze can cap the maximum even if Seoul runs warmer inland. There is no on-chain settlement mechanic here beyond the market’s USDC resolution, so the key dependency is the final Wunderground record rather than intraday noise in crypto prices; BTC and ETH moves do not affect the outcome except through general risk sentiment.

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 — 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

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on PolyGram?

Zero. PolyGram 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.