Highest temperature in Seoul (Incheon) on August 8?

Platform comparison

Market context

The event is whether the **highest hourly temperature** at Incheon International Airport, as logged in Weather Underground’s Daily Observations table, lands in a given Celsius band on 8 August 2026. For a programmatic trader, the key is not the headline “day high” but the observation feed itself: scrape or poll the station page, parse each timestamped entry, and map the maximum reported value to the market’s bands, because the settlement rules explicitly prioritise Daily Observations over the summary panel.[13][6]

The current 0% implied probability is at odds with the recent heat pattern across the Seoul–Incheon area. Seoul has already posted multiple extreme readings this week, including 39.9°C and 40.2°C at automated stations, while a Reuters report said the Korea Meteorological Administration was tracking a record heatwave across the peninsula.[2][3][16] That makes the upper bands more plausible than a cold outlier, although Incheon’s coastal location usually dampens extremes relative to inland Seoul, so traders should anchor expectations to the airport station rather than citywide reports.[8][12]

The practical catalysts are the KMA short-range forecast, any local thunderstorm or sea-breeze shifts, and the cadence of hourly station updates before the settlement cutoff at 12:00 UTC, which is late afternoon in Korea.[11][13] In a tooling workflow, conditional orders can be tied to forecast revisions or new observation prints: if the morning run lifts the expected high into the mid-30s, the market can reprice quickly; if clouds, rain bands, or marine inflow cap the afternoon, the realised maximum may settle one or two bands lower than the broader Seoul headlines suggest.[8][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul (Incheon) on August 8? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Review UK, which mirrors the Polymarket order book at 0% fees.

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 Polymarket Review 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.

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%.