Highest temperature in Seoul on July 23?

Platform comparison

Market context

Seoul’s late-July heat is usually a **daytime high in the upper 20s to around 30°C**, with humidity and rain often limiting how far temperatures surge. Forecast-style climate guides put July highs around 30°C, with lows near 23°C, and note that rainfall is frequent through the month, which matters because cloud cover and showers can cap the daily maximum.[2][3]

For a market like this, the 0% crowd price looks like a mechanical rather than a meteorological signal: the settlement uses the **highest temperature recorded at Incheon Intl Airport Station on 23 July 2026**, not a subjective Seoul headline. Programmatically, the cleanest approach is to monitor the Wunderground station page for the day’s maximum in Celsius, then map that figure into the contract’s temperature band only once the daily record is complete and the exchange’s settlement window closes.[1] Comparable July conditions suggest that a reading in the high 20s is the base case, while a low 30s print would usually require stronger sunshine and less precipitation than the month often delivers.[2][3]

The key catalysts are short-horizon weather changes: overnight cloud break-up, morning rain bands, and any forecast revision that shifts cloud cover, humidity, or wind around the airport. A power user would watch the station-specific daily history rather than a city average, because runway-adjacent conditions can differ from central Seoul and the market resolves off the airport observation only.[1]

Sources: 1 · 2 · 3

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 Polymarket Bot UK. 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.

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 Polymarket Bot 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.