Highest temperature in Seoul on July 6?

Platform comparison

Market context

On 6 July 2026, Seoul will face its peak daytime heat under the East Asian monsoon, with the Incheon International Airport station serving as the official resolution point for the highest temperature recorded. The current crowd-implied probability for the market is 0% YES, suggesting the consensus believes the temperature will not fall within the specific range being traded, likely because the market expects a value near 28°C to 30°C based on early July climatology. Historical data frames this sharply: South Korea recorded its second-hottest July since 1973 last year, averaging 27.1°C, while Seoul recently hit 37.7°C, the highest early July temperature in 117 years, indicating that while averages cluster near 28°C, extreme variance is a genuine underdog factor traders must respect.

The primary catalyst for traders to watch is the short-range forecast convergence from the Korea Meteorological Administration, which will dictate capital flow into adjacent temperature bands before the noon Seoul resolution window. Recent reports from Climate Central highlight that South Korea endured record-breaking summer heat in July 2025, reinforcing the risk that the monsoon could push temperatures higher than the modal 28°C outcome, creating a contrarian value spot for those betting on the 30°C+ range. With only £2,192 in volume, the market remains highly sensitive to any updated KMA announcements between now and settlement, meaning the 0% implied probability may reflect a fragmented field rather than a definitive lack of value in the specific range offered.

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

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 Who Will Win 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.