Highest temperature in Seoul on June 20?

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Market context

Seoul’s late-June heat profile is usually warm but not extreme, with average daily highs around 27–29°C and typical June highs rarely breaking the high-20s to low-30s Fahrenheit equivalent beyond the upper 80s in Seoul’s climate history[1]. That makes the current **1% YES** crowd price look broadly aligned with a view that a very specific daily peak at Incheon International Airport Station needs a sharp, short-lived heat surge rather than ordinary summer warmth. For comparison, recent historical data for Seoul shows a June 2026 high of 90.1°F on 17 June, which underscores that warm spikes can happen, but they still sit near the top end of the monthly distribution rather than the norm[3].

The key cross-platform comparison is that prediction-market pricing appears to be discounting a high-end outcome more heavily than the broad seasonal climatology would alone justify, while a sportsbook-style market would typically need a strong weather model signal to move meaningfully above single-digit odds. KMA’s medium-range forecasts for the Seoul/Incheon region should therefore matter most, alongside any shift in cloud cover, humidity, or wind that could cap the midday maximum at the airport station[5]. Weather Underground’s own settlement source is the decisive reference, so traders should watch the specific Incheon airport observation rather than Seoul city forecasts, especially because coastal influence can leave airport highs a little lower than inland readings. Recent reporting has also underlined that South Korea has been prone to exceptional summer heat in recent years, including record-breaking and near-record temperatures, which is the main historical reason a 1% price can still be plausible if the synoptic pattern turns sharply hot[2][7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets UK, 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?

Best Prediction Markets UK 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.

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.

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.