Highest temperature in Seoul on July 31?

Platform comparison

Market context

Seoul’s **highest temperature** on 31 July is usually a late-morning to afternoon question, and the market settles on the peak reading at Incheon Intl Airport Station rather than the city centre. Current pricing at **0% YES** is hard to square with the short-range forecasts: AccuWeather shows Seoul around **84°F / 29°C** for 31 July, while the Met Office has Seoul near **31°C** on nearby days and WeatherSpark notes that **31 July** is often one of the clearer days in the month, even though July remains humid and warm overall.[1][4][19]

The broader weather pattern also argues against an extreme upside move. Yonhap reported a continuing heatwave across South Korea, with Seoul and nearby Incheon already in the upper 20s °C early in the day and daytime highs across the region expected to stay elevated, though with some shower risk in the greater Seoul area.[6] SBS likewise reported very hot conditions with clear weather and little significant rain through the following week, which supports a warm-day outcome but not necessarily a record-breaking spike.[2] On a platform comparison basis, Polymarket-style markets typically show a direct implied probability, whereas Kalshi and Betfair are usually read through traded price or decimal odds; Smarkets is often tighter on spreads but fees and access vary by jurisdiction and KYC, which matters if you are comparing the same weather line across books.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on July 31? 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 Kalshi 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.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

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.

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.