Highest temperature in Seoul on July 1?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Incheon International Airport on 1 July 2026, a date that sits squarely within South Korea’s hot, humid monsoon season. Historical patterns show July daily averages in Seoul typically reach 27–30°C, with midday highs often climbing to 34°C or more when humidity exceeds 80% [3][5][10]. Current Polymarket pricing reflects this: the frontrunner outcome is 30°C at 58% probability, with 29°C trailing at 32%, while the market assigns 0% to any “YES” outcome for temperatures below 25°C [1]. This distribution aligns with on-chain conditional token mechanics on Polygon, where USDC liquidity flows into outcomes matching climatic expectations rather than abstract speculation.

Traders should monitor two key catalysts ahead of settlement: the official Korea Meteorological Administration short-range forecast updates and any sudden shifts in the Jangma (rainy season) timeline, which typically ends mid-July but can extend late [3][6]. A recent AccuWeather forecast for Seoul in July 2026 indicates daily highs between 81°–89°F (27–32°C), with an average of 85°F (29.4°C), reinforcing the 30°C market consensus [5]. Additionally, watch for announcements regarding the Sinchon Water Gun Festival in late July, which may influence local microclimates or humidity levels, though its direct impact on 1 July remains uncertain [3]. The resolution source—Wunderground’s Incheon station data—will be the definitive arbiter, so any discrepancies between forecast models and actual readings could trigger rapid on-chain price adjustments via Polygon’s conditional token system.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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.