Highest temperature in Seoul on June 1?

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Market context

Seoul's peak temperature on 1 June 2026 will be measured at Incheon International Airport Station and settled against historical Weather Underground data. Early June in the Seoul metropolitan area typically sits in the mid-to-upper 20s Celsius, with occasional spikes into the low 30s during warm pressure systems. The 0% crowd probability suggests traders are either awaiting clearer seasonal forecasts or treating this as a placeholder market pending resolution mechanics confirmation.

Historical June 1st temperatures at Incheon show considerable variance. Between 2010 and 2024, highs ranged from 18°C during cooler, wetter years to 31°C during early heat waves driven by Pacific anticyclones. The Korea Meteorological Administration's long-term records indicate roughly 40% of June 1st observations fall between 24–28°C, with roughly 30% exceeding 28°C. This distribution matters for positioning: the current zero probability likely reflects uncertainty over which temperature bracket the market's resolution options actually cover, rather than genuine doubt about Seoul experiencing measurable warmth.

Traders should monitor the KMA's extended-range forecasts released in late May, which typically carry useful signal for early-June conditions. Broader East Asian weather patterns—particularly the timing of the East Asian summer monsoon onset and any early tropical cyclone activity—drive Seoul's June 1st outcomes. Recent years have seen increasing volatility in early-summer temperatures across the region, though no systematic warming trend has shifted the historical median significantly. Settlement depends entirely on Wunderground's Incheon station data capture, making data availability and sensor maintenance relevant edge cases for contract holders.

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 BTC Prediction, 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.

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 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.