Highest temperature in Seoul (Incheon) on August 6?

Platform comparison

Market context

At Incheon International Airport, the key question is whether the day’s maximum on 6 August lands in the low-to-mid 30s Celsius or pushes into the high-30s, because the market settles on the single highest reading recorded at the airport station, not the citywide forecast for Seoul. Local coverage on the morning of 6 August described an extreme-heat warning across the Seoul metropolitan area and put Incheon’s daytime high near 38°C, while Seoul itself was forecast at 39°C[2][3]. That matters because even a very hot regional setup can leave the airport one or two degrees cooler than central Seoul, and small differences determine which temperature band wins.

The historical frame points to a very warm early-August climatology, with Seoul’s average August high around 84°F to 85°F and 6 August sitting near the seasonal peak[1][12]. That supports a market that is normally sensitive to heatwave amplification rather than routine summer averages. For platform comparison, Polymarket quotes the outcome as implied probability, so the current 0% YES implies the book is either effectively shut off or priced as a tail outcome, whereas Betfair and Smarkets show decimal odds that can expose the same view as an extremely long price with commissions applied on winnings. Kalshi’s event contracts are also cash-settled, but access and KYC are broader on some venues than others, so the same weather view can trade at different apparent prices depending on whether the book is showing probability, odds, or net-of-fees terms.

Traders should watch the Korea Meteorological Administration’s short-range updates, airport observations, and whether afternoon showers or sea-breeze effects cap the peak at Incheon rather than Seoul. SBS noted that the weekend should bring somewhat lower temperatures as easterly winds weaken, but that change comes after this settlement window and mainly matters if the heat spike is delayed or front-loaded[3]. On a market like this, the practical catalyst is not a headline alone but the timing of the day’s maximum reading at the airport station, because a brief early-afternoon surge can settle the contract even if later clouds or rain arrive.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul (Incheon) on August 6? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.