Highest temperature in Seoul on June 21?

Platform comparison

Active sub-markets

Market context

Polymarket is pricing this Incheon Airport high-temperature contract at **0% YES**, which implies the crowd sees almost no chance that the day’s highest reading lands in the market’s YES range. On Polymarket, traders are locking USDC on Polygon into conditional tokens, so the price is a direct read on how much value the market assigns to the settlement outcome rather than to Seoul’s weather in general.

For context, late-June weather in Seoul is usually warm rather than extreme. June daytime temperatures are commonly in the **19–28°C** range, with humidity and rain increasing as the month progresses and the monsoon season approaching; Seoul’s June forecast pages also show highs that can run higher on individual days, but the monthly pattern still centres on early-summer warmth rather than sustained heatwaves.[1][2][3][7] That matters because this market settles on the **highest temperature recorded at Incheon Intl Airport Station**, not on the city-wide average or a noon snapshot, so a single hot afternoon reading is what counts.[4]

A trader watching this market should focus on the local forecast around Incheon and the broader Korea Meteorological Administration updates, especially any sudden rise in highs, humidity, or thunderstorm timing that could alter the day’s peak temperature.[4][9] The settlement source is Wunderground’s daily history page for Incheon Airport, and the market resolves on the highest Celsius reading shown there for 21 June, so the main dependency is the recorded maximum rather than any forecast estimate.[4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on June 21? 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 Scam? — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

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.

What does it cost to trade on Polymarket Scam??

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

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.

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.