Highest temperature in Seoul on June 27?

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Market context

The underlying event is the highest temperature recorded on 27 June 2026 at Incheon International Airport, the standard proxy for Seoul’s urban heat, measured in degrees Celsius and resolved via Wunderground data. This date sits at the cusp of Korea’s monsoon season, when humidity rises and afternoon showers become frequent, often capping daytime peaks despite warm mornings.

Historically, late June in Seoul sees highs between 26°C and 28°C, with the average warmest day reaching 26.7°C [9]. Early June averages 19–28°C [1], while late June is notably hotter and more humid, with a higher rain probability [3]. Given this pattern, a 0% YES probability implies the market expects the temperature to fall below the lowest defined range—likely under 20°C—which contradicts typical late-June climatology unless an extreme cold anomaly occurs.

Traders should monitor the Korea Meteorological Administration’s short-range forecasts for 27 June, particularly the 9 AM–time-of-day high readings [6], and watch for any sudden shifts in cloud cover or precipitation timing. A recent travel guide notes that compact umbrellas are essential later in the month due to unpredictable downpours [2], which could suppress temperatures. Programmatically, one would ingest Wunderground’s hourly data stream for RKSI, filter for the 27 June daily maximum, and cross-reference with KMA’s real-time alerts to validate whether the observed peak aligns with seasonal norms or signals an outlier.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on June 27? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Review UK — the application we operate, where you trade directly against 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

Where can I trade this market with the lowest fees?

On Polymarket Review UK, 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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

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