Highest temperature in Seoul on June 20?

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Market context

The relevant event is the highest temperature recorded at Incheon Intl Airport Station during 20 June 2026, so the market is really about whether that day produced a comparatively warm early-summer high in the Seoul metro area, not about the city’s overnight low or the daily average. June in Seoul is normally warm rather than extreme, with long-run June daytime maxima around 26°C and typical ranges cited around 19–28°C, while late June also brings rising humidity and the approach of the rainy season.[1][2][3]

For framing a 0% implied probability, the key comparator is historical June behaviour: a reading above the low-to-mid 20s Celsius is ordinary, but a very hot outcome is less common than in July and August, and rainfall or cloud can easily cap the day’s maximum.[1][2][4] Programmatically, this kind of market is usually handled by pulling the Wunderground history page after the settlement window closes, extracting the day’s maximum Celsius value for RKSI, and mapping it to the published range rather than relying on intraday forecasts or city-level averages.[1]

The main catalysts are forecast updates and any synoptic shift that changes cloud cover, humidity, or rainfall timing on the day itself; the Korea Meteorological Administration’s short-range forecast is the most practical operational input for a trader, because it gives the latest daily high and is updated close to event time.[5] Late-June seasonal transition matters as well: monsoon onset can arrive around this period, so a wet or overcast setup can suppress the maximum, while a brief clear spell can push the station reading towards the upper end of the usual June band.[2][3][4]

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 Polymarket Bot UK — 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

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On Polymarket Bot 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 Bot 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.

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 Bot UK?

Zero. Polymarket Bot UK 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.