Highest temperature in Seoul (Incheon) on August 6?

Platform comparison

Market context

Incheon’s airport station is being priced as if a **very low maximum** is most likely, with the market showing **0% YES** against a heatwave backdrop that would normally argue the other way. The handicapper’s read is simple: the crowd is treating anything above the lowest band as a near-impossibility, so the *favourite* is clearly the lowest temperature range, while any higher band is the contrarian play only if the day runs markedly hotter than current expectations.

The historical frame is mixed. August in Seoul is usually hot and humid, with average highs around the mid-20s Celsius, but forecasts for 6 August 2026 are much stronger than that, with Seoul and Incheon both flagged for extreme heat; one report puts Seoul at 39°C and Incheon at 38°C, while monthly outlooks still keep Seoul’s August highs mostly in the low-to-high 30s Fahrenheit equivalent. That gap between climatology and live forecast is where the value question sits: consensus may be anchored to the market’s current 0% YES price, yet the weather setup argues against treating sub-30°C outcomes as the only live scenario. [1][2][3][13][15]

The key catalysts are the official Korea Meteorological Administration updates, local cloud/rain development, and whether coastal influence around Incheon trims the peak after morning heating. Rain or showers would cap the high, while clear skies and persistent hot advection would leave upside to the hotter bands; recent reporting also notes heatwave warnings across the Seoul metropolitan area and a forecast of continuing tropical-night conditions, which usually supports elevated daytime readings rather than a sharp fade. Traders should watch for any midday weather deterioration, because that is the main dependency that can move the settlement temperature away from the forecast ceiling. [2][3][9][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.

UK Frequently Asked Questions

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.