Highest temperature in Seoul on June 25?

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Market context

The underlying event is the highest temperature recorded at Incheon International Airport on 25 June 2026, a date that sits at the cusp of Seoul’s early summer heat and the onset of the monsoon season. Historical data shows June highs in Seoul typically range from 19°C to 28°C, with late June often warmer and more humid than early June, occasionally pushing toward 30°C or higher under clear skies [1][2]. On 19 June 2026, Seoul already reached 34.0°C, the highest maximum recorded in the month so far, suggesting that extreme heat is possible before the rainy season fully intensifies [9]. This recent spike frames the current 0% crowd-implied probability for higher temperature ranges as potentially premature, given that June 25 is not yet in the monsoon’s core window and dry, hot days remain feasible [1][8].

Traders should monitor the Korea Meteorological Administration’s short-range forecasts for 24–25 June, which will indicate whether high-pressure systems persist or if rain clouds advance ahead of the monsoon [4]. A key catalyst is the timing of the monsoon’s official onset, which typically begins in late June and can suppress temperatures if widespread showers arrive [1][8]. Additionally, watch for any sudden shifts in funding rates or whale flows in BTC/ETH markets, as macro volatility can influence liquidity on USDC-settled prediction contracts, even if weather remains the primary driver [1]. If high-pressure conditions hold and humidity stays below 80%, temperatures could again approach the 30–35°C range seen earlier in the month, challenging the current market consensus [5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Is this market available outside the US?

BTC Prediction 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.

What does it cost to trade on BTC Prediction?

Zero. BTC Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.