Highest temperature in Seoul (Incheon) on August 6?

Platform comparison

Market context

Polymarket is pricing this Incheon Airport temperature contract at **0% YES**, which means the market is currently assigning no probability to the day’s highest reading landing in the specified outcome range. Because settlement depends on the **highest temperature recorded at Incheon Intl Airport Station** in Wunderground’s daily history record, the relevant tradeable variable is not Seoul city centre heat, but the airport station’s actual max print before the window closes on Polymarket’s **Polygon**-based conditional tokens, settled in **USDC**.

The historical frame argues for caution about reading Seoul-wide headlines too literally. August is normally among South Korea’s warmest periods, and WeatherSpark places Seoul’s highest average daily high around **6 August**, with summer highs typically in the low-to-mid 30s °C rather than extreme outliers.[13] At the same time, the Korea Meteorological Administration and Korean media were flagging a severe heatwave on 6 August, with forecasts for Seoul around **39°C** and Incheon around **38°C**, alongside warnings of tropical nights and high humidity.[2][3][10] That combination matters because this market settles on the airport station, where coastal influence can keep the max below the most dramatic inland or city-centre figures.

For traders, the key catalysts are the **latest KMA short-range updates**, any shift in the heatwave warning, and whether afternoon cloud, rain, or sea-breeze effects cap the airport’s daytime high.[4][2] In practical terms, the contract can reprice quickly if forecast highs for Incheon move by even 1–2°C, because Wunderground’s settlement source is the station’s observed daily maximum rather than a forecast or feels-like measure. By early morning UTC, Seoul’s live observations were already hot and humid, with current conditions around the low 30s °C in city forecasts and mid-80s °F in app-based feeds, but the decisive print for this market will be the highest actual airport observation later in the day.[12][15][14]

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

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 PolyGram. 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.

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%.