Highest temperature in Seoul on June 4?

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Market context

On 4 June 2026, Seoul's highest temperature will be recorded at Incheon International Airport Station and measured in Celsius. The settlement mechanism uses historical weather data from Weather Underground, with traders on Polymarket currently pricing the entire temperature distribution at 0% YES across all available ranges—a technical artefact reflecting how conditional token markets function when no single outcome has accumulated meaningful USDC liquidity yet.

Seoul's early June climate sits at the threshold between late spring and early summer, with historical highs typically ranging between 26–29°C. The city's average maximum temperature for early June hovers around 27°C, though heat waves occasionally push readings into the low 30s. Reviewing comparable years shows significant variability: some years see relatively cool early June conditions whilst others experience early-season heat spikes driven by subtropical air masses moving northward from the Pacific. The Incheon station, located on the western coast, tends to record slightly cooler readings than central Seoul due to maritime influence, a factor that should anchor expectations toward the lower end of plausible ranges.

Traders monitoring this contract should track seasonal weather pattern forecasts issued by the Korea Meteorological Administration in late May, which typically provide 10–14 day outlooks. El Niño or La Niña conditions active during spring 2026 will influence whether June develops as warmer or cooler than climatological norms. Additionally, any tropical cyclone activity in the western Pacific during early June could introduce moisture and cloud cover, suppressing daytime highs, though such systems rarely reach Seoul before mid-June.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket 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.

Is this market available outside the US?

Polymarket UK 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.

What does it cost to trade on Polymarket UK?

Zero. Polymarket 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 UK triggers a quick verification flow that finishes in minutes.