Highest temperature in Seoul on June 22?

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Market context

Seoul’s daytime heat in June is usually moderate rather than extreme, with typical highs around 19–28°C and a gradual warm-up through the month as humidity rises. That matters here because the market settles on the highest reading at Incheon Intl Airport Station, so even a warm spell near the upper end of June norms would still need to break well above the usual range to land in the top temperature bands.[1][2][3]

Historically, June in South Korea is an early-summer shoulder period rather than peak heat, and late June can be hotter and more humid as the rainy season builds. Comparable monthly guidance puts Seoul’s June highs in the low-to-mid 20s Celsius on average, while some forecast services allow for isolated highs in the low 30s, which is the sort of tail outcome that would matter more than the monthly mean for a one-day max-temperature contract.[1][3][4]

For traders, the key catalysts are the short-range forecasts and any shift in the East Asian summer pattern, especially humidity, cloud cover and rainfall timing, because those directly cap daytime maxima. The market also cannot resolve if the underlying Wunderground station data is missing or not updated, so the practical watchpoint is whether the airport station posts a clear daily high before the settlement window closes at noon UTC; there is no on-chain finality until the weather source itself confirms the number.[5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Seoul on June 22? 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 for comparison. 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

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction triggers a quick verification flow that finishes in 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.