Highest temperature in Seoul (Incheon) on August 17?

Platform comparison

Market context

Seoul's weather in mid-August typically peaks during the region's most intense heat period, with Incheon International Airport—the official measurement station for this market—recording daily highs frequently exceeding 30°C. August 17th falls within the height of the Korean summer monsoon season, when atmospheric conditions can shift rapidly between humid heat waves and cooler, rain-interrupted spells. The 0% crowd probability suggests traders are either uncertain about the exact temperature thresholds offered or expect conditions substantially below historical norms for that date.

Historical August data from Incheon shows considerable year-to-year variation. Between 2015 and 2023, August 17th highs ranged from 26.5°C to 33.8°C, with an average near 30°C. The Korea Meteorological Administration's seasonal forecasts, typically released in July, will be critical for narrowing expectations around whether 2026 tracks toward cooler or warmer-than-average conditions. Traders should monitor typhoon activity patterns in the Western Pacific during early-to-mid August, as tropical systems can suppress temperatures significantly or, conversely, drive pre-storm heat spikes.

The market's reliance on Weather Underground's Daily Observations table rather than summary figures creates a technical distinction worth noting: different prediction platforms handle such granular resolution criteria differently. Polymarket and Kalshi both accept detailed source specifications, though their fee structures (Polymarket's 2% taker fee versus Kalshi's variable structure) and liquidity profiles may affect how tightly prices cluster around historical averages. Betfair and Smarkets typically require broader resolution criteria, making this market's precision a platform-specific consideration for traders comparing books.

Methodology

This page compares Highest temperature in Seoul (Incheon) on August 17? 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

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets 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.