Highest temperature in Seoul on July 11?

Platform comparison

Market context

Seoul faces its peak summer heat on 11 July 2026, with the market tracking the highest temperature recorded at Incheon International Airport. The crowd currently assigns a 0% implied probability to the YES outcome, suggesting traders expect temperatures to stay within a lower range than the market’s threshold. This stark pricing contrasts with historical precedents where early July has already delivered record highs; Seoul recently scorched at 37.8°C on 8 July, the highest early-July temperature ever recorded in the capital [1]. Such anomalies indicate that a 0% probability may understate the risk of extreme heat, especially given that July averages in Seoul often reach 28–30°C with humidity pushing felt temperatures above 34°C [3][4].

Traders should monitor the Korea Meteorological Administration’s short-range forecasts released hourly, as sudden monsoon breaks or heat dome intensifications can shift daily highs dramatically [9]. Recent forecasts for July 2026 show daily highs ranging from 82°F to 99°F (28°C–37°C), with overnight lows staying above 24°C [2]. On platforms like Polymarket, this 0% is expressed as implied probability, whereas Kalshi or Betfair would display decimal odds near infinity, and fee structures diverge significantly: Polymarket charges 0–2% while Smarkets cap at 2% with full KYC flexibility. The settlement hinges on Wunderground’s Incheon station data, a dependency that introduces latency compared to real-time meteorological feeds used by traditional weather books.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Seoul on July 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. 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.