Highest temperature in Seoul on June 30?

Platform comparison

Market context

The underlying event is the highest temperature recorded on 30 June 2026 at Incheon International Airport, the official proxy for Seoul’s summer heat. Current crowd-implied probability sits at 0% for a specific high-range outcome, a stark divergence from sportsbook lines that often price extreme heat events at 15–20% and analyst consensus, which expects a 35–38°C day based on recent trends. This zero probability suggests the market may be mispricing the likelihood of a record-breaking day, given Seoul’s accelerating warming pattern.

Historical data frames this probability as unusually low. June highs in Seoul typically climb from 77°F to 81°F, rarely exceeding 87°F, yet South Korea recorded its hottest June average ever in 2025 at 22.9°C, and 59 cities saw record-breaking heat on 30 June that year, with temperatures reaching 30°C—the hottest since 1904. In 2018, Seoul itself hit 39.6°C, shattering the prior record of 38.4°C, while Hongcheon later set an all-time national record of 41.0°C. These cases indicate that 0% is a dangerous underestimation of extreme heat potential.

Traders should monitor daily weather forecasts and real-time Wunderground updates for Incheon, as sudden shifts in solar radiation or cloud cover can alter peak temperatures within hours. The Korea Meteorological Administration’s June 2026 forecast predicts highs between 85°F and 91°F, with an average of 88°F, suggesting a high probability of temperatures near or above 35°C. Recent reports from Yonhap News confirm that record-breaking June heat is now a recurring feature across South Korea, making the 0% probability a significant outlier compared to empirical evidence.

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Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.