Highest temperature in Seoul on July 7?

Platform comparison

Market context

The underlying event is the peak daytime heat recorded at Incheon International Airport on 7 July 2026, a date historically prone to extreme summer temperatures in the Seoul metropolitan area. While the current crowd-implied probability for a specific high-temperature range sits at 0% YES, this figure diverges sharply from historical precedents where July highs in Seoul routinely climb between 30°C and 35°C, rarely dipping below 24°C even during cooler spells[1]. Recent years have shown a marked upward trend in thermal intensity, with South Korea experiencing its second-hottest July since 1973 and Seoul reaching 37.7°C in early July 2025, the highest such reading in 117 years of records[5][7]. The all-time national heat record of 41.0°C, set in Hongcheon, further underscores the region’s capacity for extreme heat, suggesting that a 0% probability may reflect a market misunderstanding of seasonal climatology rather than an actual meteorological anomaly[2].

Traders should monitor daily weather forecasts issued by the Korea Meteorological Administration and real-time data from Wunderground, which serves as the official resolution source for this contract[3]. Key catalysts include the development of high-pressure systems over the Pacific, which typically drive tropical nights and sustained daytime heat in Seoul, as well as any sudden shifts in monsoon patterns that could introduce cooler rainfall[6]. Recent reports highlight a century-old record for tropical nights in Seoul, with overnight temperatures exceeding 25°C for 22 consecutive days, indicating a persistent heatwave environment that could elevate daytime peaks significantly[8]. Analysts should also watch for updates on regional humidity levels and solar radiation, as these factors directly influence maximum temperature readings at Incheon Airport[1]. The divergence between prediction-market odds and analyst consensus on this contract warrants scrutiny, particularly given the historical consistency of high July temperatures in this region.

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 PolyGram, 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.

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.

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?

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