Highest temperature in Seoul on June 20?

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Market context

Seoul’s daytime high on 20 June will be judged on the Incheon Intl Airport Station reading, and the market is pricing a **1%** chance of the *YES* band, which makes this a clear **underdog**. The current public consensus elsewhere points to the mid-20s Celsius: Polymarket’s live distribution has 24°C as the frontrunner at 60%, then 25°C at 25%, with 26°C at 8% and 27°C at 2.4%.[1] That lines up with normal June conditions, as Seoul’s June daily highs typically rise through the month and sit around 26–28°C, with average highs around 77–81°F and few days breaking far above the high-20s Fahrenheit equivalent range.[2]

For handicapper framing, the market looks anchored to a standard early-summer profile rather than an extreme-heat setup. The value question is whether traders are underweighting any late-run warming or overconfident in a tightly clustered 24–25°C outcome; the contrarian case is that a clean high around 26–27°C is not rare in the historical backdrop, even if the tail above that is small.[1][2] South Korea has also seen severe heat in the broader historical record, including a national all-time high of 41.0°C at Hongcheon, but that is a very different regime from what is normally needed to lift a Seoul airport daily high into the upper-20s or beyond.[3]

What matters now is the short-horizon weather pattern over the rest of the day, especially cloud cover, rain bands and wind direction, because those are the main drivers of the airport’s maximum temperature reading before the 12:00 UTC settlement window closes. A useful cross-check is recent local history: Seoul has already posted very warm June readings in the mid-to-upper 20s, and recent daily averages have reached 28.2°C, with the city’s June record cited at 29.4°C on 20 June last year.[5] If forecasts continue to lean warm and dry, the consensus 24–25°C band stays the favourite; if cloud or precipitation builds, the market’s low-probability tail gains relative appeal.[2][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on June 20? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Who Will Win — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Who Will Win, 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'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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win 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.