Highest temperature in Seoul on July 7?

Platform comparison

Market context

Seoul on 7 July 2026 will see its peak heat recorded at Incheon International Airport, a location that typically tracks slightly cooler than the city centre but remains a critical benchmark for regional extremes. The market currently implies a 0% probability for any temperature above a specific threshold, suggesting the crowd believes conditions will stay well within historical norms. This stance aligns with the consensus that July highs in Seoul rarely exceed 91°F (32.8°C), with daily averages climbing from 81°F to 85°F as the month progresses[1].

Historically, Seoul has witnessed record-breaking heat, including a 37.7°C (99.9°F) spike in early July 2025, the highest in 117 years of records[7]. Yet, such extremes are outliers; the all-time Korean record of 41.0°C was set in Hongcheon, not Seoul, and tropical nights above 25°C have become more frequent but still do not guarantee daytime peaks beyond 35°C[2][6]. The value spot likely lies in contrarian positions betting on a modest heatwave, as the 0% implied probability ignores the increasing volatility of summer temperatures in South Korea, which saw its second-hottest July since 1973 in 2025[5].

Traders should monitor the Korea Meteorological Administration’s daily forecasts for 7 July, particularly any announcements of high-pressure systems or monsoon delays that could trap heat near Incheon. Recent data from June 2026 shows a peak of 87.7°F (32.6°C) on 27 June, indicating the region is already warming into summer conditions[3]. A sudden shift in wind patterns or a delay in the rainy season could act as a catalyst, pushing temperatures toward the upper historical range and creating value for those betting against the crowd’s absolute certainty in mild conditions.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on July 7? 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, 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

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 Who Will Win. 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 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 Who Will Win 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.