Highest temperature in Seoul on June 23?

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Market context

The underlying event is the highest temperature recorded at Incheon International Airport on 23 June 2026, measured in degrees Celsius and resolved via Wunderground data. Current crowd-implied probability sits at 0% for the "YES" outcome, suggesting traders believe the temperature will not fall within the specific range being bet on, despite Seoul’s typical late-June heat.

Historical patterns and comparable markets frame this low probability. In June, Seoul transitions from comfortable early-month warmth to noticeably hotter, more humid late-month conditions, with daily highs often reaching 29°C to 31°C. Polymarket data shows 29°C as the frontrunner at 40%, followed by 28°C at 28%, while 31°C or higher holds 12.7% [1]. AccuWeather forecasts June 2026 highs between 83°F and 89°F (28°C–32°C), with an average of 86°F (30°C) [4]. This aligns with KMA short-range forecasts indicating a maximum of 31°C for the day [5], reinforcing that temperatures will likely exceed the lower thresholds implied by the 0% YES probability.

Traders should monitor real-time updates from the Korea Meteorological Administration and Wunderground’s hourly logs, as late June often brings sudden rain or humidity spikes that can shift peak temperatures. The rainy season approaches in late June, increasing the chance of cloud cover that may suppress daytime highs [3]. While no major crypto-specific catalysts directly tie to this weather event, on-chain settlement in USDC and BTC/ETH macro volatility could influence liquidity and trading volume on btc-prediction.bet. Whale flows into temperature-linked contracts may emerge if funding rates on crypto exchanges signal risk-off sentiment, pushing capital toward non-correlated assets like weather derivatives. Recent KMA data confirms current conditions at 22.8°C with a feel of 23°C, but the day’s peak remains uncertain [7]. Traders must watch for announcements from local weather authorities as the settlement window closes on 23 June 2026 at 12:00 UTC.

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

Where can I trade this market with the lowest fees?

On BTC Prediction, 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.

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.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction 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.