Highest temperature in Seoul (Incheon) on August 11?

Platform comparison

Market context

Seoul's maximum temperature on 11 August 2026 will be measured at Incheon International Airport Station and reported through Weather Underground's Daily Observations table, with resolution tied to whichever temperature bracket captures that recorded high in degrees Celsius. The current 0% implied probability across platforms suggests traders are either absent from this specific date-range market or treating August peak temperatures as too volatile for confident positioning this far ahead.

Seoul experiences extreme summer heat, with August typically the warmest month. Historical data from the Korea Meteorological Administration shows August averages around 29–30°C, though daily highs frequently exceed 33°C and occasionally reach 35–37°C during heat waves. The 2018 heat wave pushed Seoul to 39.6°C, whilst more recent Augusts have seen highs in the 34–36°C range. These precedents matter because they establish the realistic upper and lower bounds; traders comparing Polymarket's decimal odds format against Kalshi's binary structure will find the latter's straightforward yes/no framework more intuitive for temperature bands, though Kalshi's tighter KYC requirements may limit liquidity on niche weather markets compared to Polymarket's broader access.

Monitoring the Korea Meteorological Administration's seasonal forecasts and any tropical cyclone activity in the Western Pacific will be critical, as typhoons can suppress temperatures or trigger sudden spikes. The settlement window closes at midday UTC on 11 August 2026, meaning traders must account for the time-zone offset between Seoul and resolution timing. Fee structures across platforms—Polymarket's 2% taker fee versus Kalshi's variable structure—become material only if liquidity materialises; currently, the absence of trading activity suggests limited market depth across all venues.

Methodology

We read Highest temperature in Seoul (Incheon) on August 11? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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

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.

Which platform is accessible globally?

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