Highest temperature in Seoul (Incheon) on August 11?

Platform comparison

Market context

Seoul's summer temperatures regularly exceed 30°C in August, with the city's official weather station at Incheon International Airport recording daily highs typically between 28–34°C during this period. The 0% crowd probability on this market suggests traders are pricing in either an unusually cool spell or scepticism about the specific resolution methodology, which relies on Weather Underground's Daily Observations table rather than the Day High & Low summary—a distinction that occasionally produces discrepancies when multiple observation points feed into a single station record.

Historical August data from Incheon shows that temperatures above 35°C occur roughly once every three to five years, whilst readings below 25°C are exceptionally rare. The current flat probability across all temperature bands reflects uncertainty about whether the crowd trusts Weather Underground's granular observation data or expects typical late-summer conditions. Kalshi and Smarkets typically display implied probabilities directly, whereas Polymarket's decimal odds format can obscure the actual probability distribution; this market's 0% reading suggests either a technical issue or genuine consensus that no single range will capture the settlement value.

Traders should monitor South Korea's meteorological forecasts from late July onwards, particularly any alerts regarding typhoon activity or heat waves that could push August 11th temperatures toward extremes. The Korea Meteorological Administration publishes 10-day outlooks regularly, and any significant deviation from the 30-year August average would shift market expectations. Settlement hinges entirely on Incheon station data availability; airport closures or sensor malfunctions could delay resolution, a risk less transparent on platforms with opaque data-source verification than on Betfair, where historical weather market disputes are publicly documented.

Methodology

This page compares Highest temperature in Seoul (Incheon) on August 11? 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

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

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.