Highest temperature in Seoul on July 6?

Platform comparison

Market context

On 6 July 2026, Seoul will face its peak daytime heat, a real-world event that determines whether the city’s official maximum temperature lands exactly at 28°C. While cross-platform odds diverge sharply—Lines.com prices the 28°C outcome at a 40.5% implied probability, whereas the current prediction market shows a 0% YES crowd-implied probability—historical climatology suggests the 0% figure is likely an outlier. Early July Seoul typically sees mean daily highs between 28°C and 30°C, with significant variance tied to the East Asian monsoon, making 28°C the modal outcome rather than an impossibility [1].

Analyst consensus aligns with this climatology, noting that short-range forecast convergence is already pushing fresh capital toward the 28°C band, a 3.0% price jump in the last 24 hours signals this shift [1]. Traders must monitor the Korea Meteorological Administration’s updated forecasts released before noon Seoul time, as the market remains highly sensitive to these updates [1]. Recent records reinforce the volatility: Seoul hit 37.7°C in early July 2025, the highest in 117 years, while 2025 also saw 22 tropical nights, proving that adjacent temperature bands remain dangerously close to the 28°C target [5][6]. The fragmented field of nine competing outcomes means no single band dominates, yet the 28°C range remains the statistical centre [1].

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.

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 Best Prediction Markets UK 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.