Highest temperature in Seoul on July 13?

Platform comparison

Market context

Seoul faces a critical heat check on 13 July 2026, as traders assess whether the Incheon International Airport Station will record a temperature high enough to trigger a YES outcome in this weather prediction market. The current crowd-implied probability sits at 0% YES, suggesting the market expects temperatures to remain below the specific threshold required for resolution, despite Seoul’s reputation for intense summer heat.

Historical data frames this near-zero probability with caution: July in Seoul typically sees highs rarely exceeding 33°C (91°F), though extreme outliers exist, such as the 37.8°C recorded in early July 2023—the hottest in 117 years [1][6]. South Korea’s all-time record of 41.0°C was set in Hongcheon, not Seoul, and the city’s second-hottest July occurred in 1994 with an average of 27.7°C [3][4]. While tropical nights above 25°C have broken century-old records recently, sustained daytime extremes matching the market’s implied threshold remain statistically rare for mid-July in the capital [2].

Traders should monitor the Korea Meteorological Administration’s daily forecasts and real-time Wunderground updates for the Incheon station, as cloud cover and monsoon activity often suppress peak temperatures in Seoul compared to inland regions [5][10]. Unlike Kalshi’s decimal odds or Betfair’s spread betting, Polymarket’s implied probability format here offers a direct 0–100% view, while Smarkets’ lower fees may appeal to high-frequency scalpers watching hourly temperature ticks [1]. No official announcements are pending, but the settlement window closing at 12:00 UTC means any late-afternoon heat spike will be excluded from resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on July 13? 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

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

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.

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.

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.