Highest temperature in Seoul on May 30?

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Active sub-markets

Market context

Seoul's highest temperature on 30 May 2026 will be measured at Incheon International Airport Station and resolved against historical weather data from Wunderground. The settlement window closes at midday UTC on that date, meaning traders must account for the full diurnal cycle recorded at the station. The 0% crowd probability suggests either extreme confidence in a specific temperature band or minimal liquidity across all ranges on this particular market.

Late May in Seoul typically sits within a warm, pre-monsoon window. Historical data from the Korea Meteorological Administration shows average highs around 26–28°C for this period, with occasional spikes above 30°C during early heat waves. The 2023 and 2024 May records show variability: Seoul recorded 31.5°C on 28 May 2023 and 29.1°C on 30 May 2024. This historical spread matters because different prediction platforms weight tail-risk scenarios differently. Kalshi's binary structure and Betfair's decimal odds framework would price the same meteorological outcome differently; Polymarket's AMM mechanics and Smarkets' matching engine create distinct liquidity profiles for temperature brackets that sit outside consensus ranges.

Traders should monitor the East Asian weather pattern forecasts released by the Korea Meteorological Administration in early May 2026, particularly any alerts regarding Tibetan high-pressure systems or tropical moisture incursion. Seasonal typhoon activity, whilst typically later in the year, occasionally sends warm, humid air northward in late May. KYC requirements vary across platforms—Kalshi requires US residency, whilst Polymarket and Smarkets operate with different geographic restrictions—which affects which trader cohorts can access this market and thus influence probability calibration.

Methodology

We read Highest temperature in Seoul on May 30? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Is this market available outside the US?

Polymarket Alternative is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative triggers a quick verification flow that finishes in minutes.

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.