Highest temperature in Seoul (Incheon) on August 1?

Platform comparison

Market context

Incheon’s airport station is the key reference point here: the market settles on the day’s *highest* temperature there on 1 August, not on Seoul city proper, so the relevant read is the airport’s intraday maximum rather than the capital’s headline forecast. Early-day conditions were already very warm, with Incheon at 26.8°C at 9:00 a.m. and 27.0°C at 5:00 a.m., while national coverage described a broad heatwave across South Korea. [1][5]

That matters because recent comparable cases show how quickly the upper end can move once a strong heat dome is in place. Reuters reported South Korea’s highest-ever measured temperature at 41.4°C in Yangsan on 31 July, underscoring that the country has already been producing extreme readings well above typical August norms; by contrast, historical August averages for Incheon and Seoul are usually much lower than the low-to-mid-30s. [6][18][3] The current crowd-implied 0% YES looks to be a market pricing of an outcome that would require an unusually sharp airport reading, rather than a routine summer high.

For platform comparison, Polymarket users typically see this as an implied probability, while Kalshi and Betfair-style books tend to express the same view through different price formats, with Betfair adding commission to winnings and Kalshi’s fees and access depending on jurisdiction and KYC checks. On a weather market like this, the practical catalyst is the actual daytime temperature trace at Incheon International Airport Station, with the decisive move likely coming later in the local afternoon after the morning minimums already showed elevated heat. Forecast products from the Korea Meteorological Administration and local reporting pointed to persistent heat into early August, with Seoul around 36°C and Incheon around 34°C in some forecasts, which is consistent with a wide distribution of outcomes but still leaves the exact airport maximum to be confirmed by the official Wunderground history page. [4][16][8]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul (Incheon) on August 1? 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 Robinhood Prediction Markets, 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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets 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.