Highest temperature in Seoul on July 9?

Platform comparison

Market context

On 9 July 2026, the Incheon International Airport Station will record its peak temperature, a single data point that determines whether Seoul’s heat hits the 26°C threshold. The crowd-implied probability for this outcome sits at 0% YES, reflecting a consensus that such warmth is implausible. Yet historical patterns suggest a contrarian angle: July in Seoul typically sees highs climbing from 81°F to 85°F (27.2°C to 29.4°C), rarely dipping below 74°F (23.3°C) [2]. Recent records underscore this volatility, with South Korea experiencing its second-hottest July since 1973, averaging 27.1°C, and Seoul itself hitting 37.8°C on 8 July—the highest early-July temperature in 117 years [4][7].

The value spot for traders lies in the gap between the 0% market price and the historical likelihood of temperatures exceeding 26°C. Catalysts to monitor include the Korea Meteorological Administration’s daily heat advisories and Wunderground’s real-time updates for Incheon, which will resolve the market [3]. With South Korea enduring record-breaking summer heat in August 2025 and tropical nights persisting in Seoul for 117 years, the underdog scenario of hitting 26°C gains credibility [4][6]. Traders should watch for any sudden shifts in monsoon patterns or urban heatwave announcements, as these dependencies could trigger a contrarian surge in probability. The consensus remains bearish, but the data hints at hidden value in the underdog.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on July 9? 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 Who Will Win 2026, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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.

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.