Highest temperature in Seoul on June 15?

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Active sub-markets

Market context

On 15 June 2026, the highest temperature recorded at Incheon International Airport Station will fall into one of several defined ranges, measured in degrees Celsius. The settlement will draw from Wunderground's historical weather data for that specific location and date, with the resolution source locked to a single authoritative reading rather than averaging multiple stations across the Seoul metropolitan area.

Seoul's June climate sits at the threshold between late spring and early summer, with daily highs typically ranging from 24–28°C, though heat waves can push readings several degrees higher. Historical precedent matters here: the city has experienced June temperatures exceeding 30°C in roughly one in five years over the past two decades, with the record high for mid-June standing near 33°C. The 0% crowd probability currently assigned suggests traders are either heavily discounting an extreme heat scenario or the market has attracted minimal liquidity. Kalshi's binary structure and Betfair's decimal odds framework would handle this differently—Kalshi forces a yes/no choice on a specific threshold, whilst Betfair's lay mechanics allow traders to express scepticism through shorter odds. Polymarket's range-based settlement here distributes conviction across multiple buckets, reducing the all-or-nothing character of binary books.

Traders should monitor the East Asian monsoon forecast and any heat dome positioning in late May and early June 2026. South Korea's Meteorological Administration typically issues extended outlooks three to four weeks ahead; these updates will signal whether anomalous warmth is probable. Incheon's coastal location moderates extremes slightly compared to inland Seoul, a detail that affects how historical records translate to this specific station's likely range.

Methodology

We read Highest temperature in Seoul on June 15? 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

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.