Highest temperature in Seoul on July 4?

Platform comparison

Market context

The real-world event in question is the peak temperature recorded at Incheon International Airport on 4 July 2026, with the market currently assigning a 92% probability to a 28°C high and only a 30.5% chance for 29°C, despite the crowd-implied 0% for the YES outcome on the specific 29°C bracket. On Polymarket, this contract trades as a conditional token on the Polygon network, settled in USDC, where the pricing mechanism reflects a heavy consensus that 28°C is the dominant outcome, leaving the 29°C bracket as a minority call with roughly one-in-three implied odds. The market closes at noon KST, and the resolution relies strictly on official meteorological data from Wunderground for that specific station.

Historical patterns for South Korea in July show daily average highs nearing 30°C, yet the monsoon season (Jangma) brings concentrated, heavy rainfall that often suppresses peak temperatures, making a 28°C high statistically more probable than 29°C in this wettest month of the year [4]. The high humidity levels, frequently exceeding 80%, create a steamy feel that can mask actual air temperatures, but the frequent rain showers act as a natural cooling regulator, supporting the market’s heavy weighting on the lower temperature bracket over the higher one [4].

Traders should monitor the Korea Meteorological Administration’s short-range forecasts for immediate shower activity and precipitation intensity, as sudden rain events can rapidly alter the daily maximum temperature [6]. The timing of the monsoon’s retreat is critical, as late July often sees a shift to drier conditions, but for 4 July, the rain risk remains the primary catalyst that could prevent temperatures from climbing to 29°C [4]. Recent data indicates a 60% probability of precipitation with slight intensity, reinforcing the likelihood that the day’s high will remain capped at 28°C rather than breaking higher [6].

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Methodology

This page reviews Highest temperature in Seoul on July 4? 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 Polymarket Scam?, 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.

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.