Highest temperature in Seoul on June 12?

Platform comparison

Active sub-markets

Market context

Seoul's weather on 12 June 2026 will be measured at Incheon International Airport Station, the official reference point for the city's temperature records. The settlement hinges on the single highest reading recorded across all hours that day, converted to Celsius and placed into one of several temperature bands. Wunderground's historical archive will serve as the authoritative source, accessible via the platform's gear-icon settings to ensure consistent unit conversion.

June in Seoul typically sits within the early monsoon season, with average daily highs around 26–28°C, though extremes have reached into the low 30s. The 0% crowd probability suggests traders are either awaiting clearer seasonal forecasts or treating this as a placeholder until nearer-term weather models become available. Historical data from the Korea Meteorological Administration shows that mid-June heat waves are possible but not dominant; most years see moderate temperatures with occasional spikes. Comparable markets on Polymarket, Kalshi, and Betfair tend to see weather markets shift sharply once meteorological agencies issue extended forecasts, typically 10–14 days before the event.

Traders should monitor the Korean Meteorological Administration's official forecasts and any tropical system activity in the Western Pacific, which can redirect warm air masses northward into the Korean peninsula. Kalshi's strict KYC requirements and US-focused liquidity may limit participation here compared to Polymarket's broader international reach, whilst Betfair and Smarkets typically offer tighter decimal-odds spreads on weather once data density increases. The settlement window closes at 12:00 UTC on the day itself, leaving minimal time for post-event arbitrage between platforms.

Methodology

This page compares Highest temperature in Seoul on June 12? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative, 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

Where can I trade this market with the lowest fees?

On Polymarket Alternative, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.