Highest temperature in Seoul on July 2?

Platform comparison

Market context

On 2 July 2026, Seoul will experience its peak daytime heat, a critical real-world event that determines whether the highest temperature recorded at Incheon International Airport falls within the market’s defined range. Today, Polymarket prices this contract at 0% YES, reflecting a near-total consensus that the temperature will not hit the threshold required for a “yes” resolution. This pricing sits on the Polygon blockchain, where USDC funds conditional tokens tied to the outcome, and the market will settle once Wunderground publishes the official daily high for Incheon by 12:00 UTC on 2 July 2026.

Historical data frames this 0% probability as plausible: July in Seoul typically sees highs between 25–30°C, with occasional spikes nudging just above 30°C, but sustained extremes above that are rare. The monsoon season (Jangma), active from late June to mid-July, brings intense, short rain bursts that often suppress peak temperatures. Recent forecasts from AccuWeather confirm July 2026 highs in Seoul range from 81° to 91°F (27–33°C), with an average of 85°F (29°C), suggesting the 30°C+ threshold is unlikely to be breached consistently. The 41% surge in the July 1 market for the 30°C bracket [4] highlights volatility, yet July 2’s 0% pricing implies traders expect rain or cloud cover to cap temperatures.

Traders should monitor the Korea Meteorological Administration’s short-range heatwave alerts and real-time Wunderground updates for Incheon, as sudden cloud cover or rain could keep highs below 30°C. The Sinchon Water Gun Festival in late July [1] may increase local humidity but is unlikely to affect 2 July’s peak. Crucially, the resolution depends entirely on Wunderground’s official daily high for Incheon, not Seoul’s city centre readings, and any discrepancy between station data and forecast models could shift probabilities. With settlement hours away, the 0% price reflects confidence that monsoon-driven moisture will prevent the required temperature spike.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.

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.

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.