Highest temperature in Seoul (Incheon) on August 1?

Platform comparison

Market context

The event is the day’s **highest temperature** at Incheon International Airport, with settlement based on the Wunderground daily history page for that station. The current crowd price of **0% YES** implies the market is treating a qualifying reading as impossible or effectively out of reach, which is hard to square with Seoul-area August climatology: average highs are around 30°C, and early-August daily highs typically sit in the low-to-mid 80s °F, with the seasonal peak around 6 August rather than a sharp trough on the 1st.[1][2][12]

That makes this contract look like a classic weather-range trade rather than a binary on whether it is “hot”. Seoul’s August records show that extreme heat is not unusual, with the city’s all-time high reaching 39.6°C on 1 August in a historic heatwave, and monthly mean maximums in the low 30s °C in official Korean climate reviews.[15][6] For a terminal outcome, the key question is not whether it gets warm, but whether the airport station’s maximum lands in the market’s chosen Celsius band; on historical analogues, a midday or afternoon surge above the low-30s °C is entirely plausible, while marine influence near Incheon can temper the upside relative to inland Seoul.[15][16]

Traders should watch the operational weather setup rather than policy headlines: cloud cover, sea breeze timing, rainfall bands, and any monsoon remnants can compress the day’s high, while a clear, humid afternoon can lift the max into a higher range. Forecast products for Seoul still point to early-August highs broadly around 81°F to 88°F, which leaves the exact settlement band sensitive to the day’s evolution rather than to a stable pre-open consensus.[10][1] There is no evident sportsbook-style line here to benchmark against, so the main comparison is between the market’s flat 0% and the climatological case for a non-zero probability.[10][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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?

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.