Highest temperature in Seoul (Incheon) on August 2?

Platform comparison

Market context

The market is effectively pricing a **hot-but-not-extreme** Incheon reading, with the crowd-implied probability split across a cluster around **32–33°C** and **0%** assigned to the current yes side at the quoted level. For a handicapper, that makes the favourite the mid-30s-free, low-30s outcome, while the underdog is any upside break into **34°C+**; the consensus is that sea-breeze influence and summer humidity will keep the airport reading near the low 30s rather than forcing a higher intraday spike.[1][3][4]

Historically, this sort of August setup in Seoul-Incheon is read through the lens of the East Asian summer monsoon: persistent heat, but with coastal moderation at Incheon often trimming the top end versus inland Seoul. Recent coverage from Yonhap and other Korean outlets has the state weather agency calling for Seoul metropolitan highs in the **33–39°C** band amid an ongoing heatwave, while Incheon-specific forecasts sit nearer **33°C**; that gap is the key value point, because the market is already leaning towards a stable low-30s print and underweighting any brief lift from stronger sunshine or weaker onshore flow.[3][4][9]

The main catalysts are the short-range KMA updates, local cloud cover, and whether daytime mixing outperforms the coastal breeze during the early afternoon window before the settlement cut-off. Traders should also watch for any heat advisory escalation or revisions after the morning forecast cycle, as those can shift the market’s tail risk quickly; Reuters reported South Korea had just logged a national record of **41.4°C** on 31 July, underlining how elevated the regional temperature regime remains even if Incheon itself usually runs cooler.[5][6][11]

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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'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.

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.