Highest temperature in Seoul on June 30?

Platform comparison

Market context

Seoul is about to experience its peak June heat, with the Incheon International Airport station set to record the day’s highest temperature on 30 June 2026. Historical data shows daily highs in Seoul during June typically climb from 77°F to 81°F, rarely exceeding 87°F, while the country recently recorded its hottest June average since 1973 at 22.9°C[1][5]. A new all-time national heat record of 41.0°C was set in Hongcheon last year, and Seoul itself reached 39.6°C in 2018, confirming that extreme heat is plausible in this region[2][7].

Despite this, the prediction market currently assigns a 0% probability to any “YES” outcome, suggesting traders expect temperatures to stay well below the threshold for that contract. This divergence from sportsbook lines—which often price in higher heat odds during Korean summer—raises questions about market efficiency. Traders should monitor real-time Wunderground updates for the Incheon station and watch for any sudden shifts in cloud cover or wind patterns, as these can suppress peak temperatures. Recent reports note 59 cities in South Korea recorded record-breaking June heat, with 30 June being the hottest day since 1904, yet local conditions in Incheon may differ[8]. No official announcements are expected, but atmospheric dependencies remain critical.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.