Highest temperature in Seoul on June 8?

Platform comparison

Active sub-markets

Market context

On 8 June 2026, the highest temperature recorded at Incheon International Airport Station will determine which range this market resolves to. The settlement uses Wunderground's historical weather data for that specific location, with traders selecting from predefined temperature bands in Celsius. The 0% crowd probability suggests either extreme confidence in a particular outcome or insufficient liquidity to establish a meaningful consensus price.

Seoul's early June climate sits at the threshold between late spring and early summer, with average highs around 24–26°C but considerable year-to-year variance. Historical data from the Korea Meteorological Administration shows June 8th temperatures have ranged from 18°C to 31°C over the past two decades, reflecting the region's susceptibility to both cool maritime air masses and early heat waves driven by the Tibetan high-pressure system. This volatility explains why a single-day temperature prediction carries genuine uncertainty despite the event being only months away.

Traders should monitor the East Asian monsoon forecast and any anomalous pressure patterns emerging in May 2026, as these typically drive Seoul's early-summer weather swings. Kalshi's fixed-odds structure and lower fees (relative to Polymarket's 2% settlement fee) may appeal to weather traders seeking tighter margins on this binary-style outcome, whilst Betfair's decimal odds format allows for more granular position-sizing across temperature bands. The lack of current market depth across platforms suggests this remains a niche forecast with limited institutional interest until nearer the settlement date.

Methodology

We read Highest temperature in Seoul on June 8? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Kalshi Alternative UK routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi Alternative 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?

Kalshi Alternative 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 Kalshi Alternative UK?

Zero. Kalshi Alternative 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, Kalshi Alternative UK triggers a quick verification flow that finishes in minutes.