Highest temperature in Seoul on June 21?

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Market context

The contract turns on the **highest temperature at Incheon International Airport Station on 21 June 2026**, so the key question is whether the day finishes in a range above the low-to-mid 30s Celsius or stays closer to normal June heat. June in Seoul is typically warm rather than extreme, with average highs around **26°C** and daily highs that usually sit in the upper 20s to low 30s, while record heat remains possible but uncommon. The market’s **0% crowd-implied YES** suggests traders are treating a qualifying hot outcome as effectively absent, which is more conservative than June climatology alone would justify.[1][2]

For context, South Korea has seen June heat spikes in recent years, including reports of record-setting late-June warmth across the country and a newly established national heat record at **41.0°C** in South Korea’s history, showing that very high readings are possible even if they are not the norm.[3][6][8] That said, comparable June weather profiles for Seoul still cluster well below such extremes, with daily highs rarely exceeding the high 30s, so analysts would usually expect any specific airport-station maximum to depend on whether a short-lived heat surge develops rather than on baseline seasonal conditions.[2][9]

Traders should watch the day’s forecast updates, especially afternoon high-temperature guidance, thunderstorm timing, cloud cover and sea-breeze effects around the north-western Seoul/Incheon corridor, because those factors can materially cap or boost the station maximum. The most relevant comparison is not the city headline temperature but the airport-station reading used for settlement, which can differ from central Seoul by a degree or two; if the forecast remains near the low 30s Celsius, the market stays aligned with the current near-zero pricing, but a sharper pre-noon warm-up or delayed frontal passage would be the main catalyst for repricing.[1][2]

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 Best Prediction Markets UK — 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

Where can I trade this market with the lowest fees?

On Best Prediction Markets 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?

Best Prediction Markets 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 Best Prediction Markets UK?

Zero. Best Prediction Markets 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, Best Prediction Markets UK triggers a quick verification flow that finishes in minutes.