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. Historical patterns for Seoul in June show daily highs typically climbing from 77°F to 81°F, rarely exceeding 87°F [1]. Recent data confirms this trend, with the highest temperature in Seoul reaching 91°F on 19 June 2026, just four days prior [3]. This aligns with the 52-year record set on 19 June 1958, when Seoul hit 35.6°C, the highest June temperature in the capital since that year [8]. The current 0% YES probability for a higher range reflects the statistical likelihood that temperatures will remain within these established bounds, as extreme outliers like the 41.0°C record in Hongcheon are geographically distinct from Incheon [2].

Traders should monitor the daily weather schedules and any sudden shifts in the regional heatwave patterns that have dominated South Korea’s early summer. The Korea Meteorological Administration has flagged sustained high temperatures, with forecasts for June 2026 predicting highs between 83°F and 89°F [6]. A key catalyst is the potential for a late June heat spike, similar to the record-breaking 37.7°C reached in Seoul in early July 2023, which was the highest for that period in 117 years [7]. While the settlement window ends on 23 June, the funding flows driving book depth are tied to deposit friction and withdrawal rails; traders using Klarna or SEPA must account for on-ramp fees that could dampen participation in high-stakes positions. The market’s traction relies on these payment flows, as liquidity depth correlates directly with the ease of depositing capital via USDC or traditional rails.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Klarna UK, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Klarna UK, 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.

What does it cost to trade on Polymarket Klarna UK?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Klarna UK 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.