Highest temperature in Seoul on July 5?

Platform comparison

Market context

On 5 July 2026, Seoul will face its peak summer heat during the monsoon season, with the Incheon International Airport station serving as the official resolution point for the highest temperature recorded. Historical data confirms July is South Korea’s hottest and wettest month, where daily highs typically reach 28–30°C (82–86°F) but can spike dramatically under clear skies following rain. The current crowd-implied probability of 0% for a specific high-temperature range suggests traders doubt an extreme outlier will occur, yet past records show Seoul hit 37.8°C in early July 2024—the highest ever recorded in 117 years of data[9][10]. This divergence between historical extremes and current pricing mirrors how platforms like Polymarket (decimal odds) and Kalshi (implied probability) frame risk differently, while fee structures and KYC requirements further alter trader access across these books.

Traders must monitor the Korea Meteorological Administration’s short-range forecasts for sudden shifts in cloud cover and precipitation, as clear skies post-monsoon showers often trigger rapid temperature surges. Recent reports indicate South Korea is expecting record heat and torrential rains this summer, with Seoul already recording a May morning low of 22.3°C—the highest in 117 years[7]. The timing of the monsoon’s end is critical; if rains clear before 5 July, solar heating could push temperatures well above the 30°C average, whereas persistent cloud cover would suppress peaks. Platforms like Betfair and Smarkets diverge here in liquidity depth for weather derivatives, while fee models and settlement speeds (e.g., Kalshi’s daily resolution versus Polymarket’s event-based closure) influence how quickly traders can react to these catalysts.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on July 5? 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

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.

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.

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.

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.