Highest temperature in Seoul on June 28?

Platform comparison

Market context

The underlying event is the highest temperature recorded on 28 June 2026 at Incheon International Airport, the standard meteorological proxy for Seoul’s summer heat. Current crowd-implied probability for a YES outcome sits at 0%, yet cross-platform odds reveal a stark divergence: Lines.com shows the 28°C outcome at 48.5% following a 14.5% surge in 24 hours, while sportsbook lines on comparable heat contracts remain muted, and analyst consensus leans cautious despite recent record-breaking trends.

Historical June data frames this probability gap: Seoul’s daily highs typically climb from 77°F to 81°F (25°C to 27°C), rarely exceeding 87°F (31°C), but recent years have shattered norms—Mokko hit 28.1°C in early June 2026, and Seoul itself recorded 39.6°C in a deadly heatwave, the capital’s all-time peak [7][8]. This volatility suggests the 0% market may be underpricing extreme outliers, especially as South Korea set a national record of 41.0°C in Gangwon last year [4].

Traders should monitor the Korea Meteorological Administration’s weekly heat advisories and the timing of monsoon onset, which can abruptly suppress temperatures. A recent Korea Herald report notes June heat has already shattered records across the country, with Daegu and Mokpo hitting unprecedented highs [7]. The settlement window closes 2026-06-28T12:00:00Z, and Wunderground’s Incheon data will be the sole resolution source, making real-time monitoring of that station critical as the monsoon front approaches.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on June 28? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Best Prediction Markets UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.