Highest temperature in Seoul on June 24?

Platform comparison

Active sub-markets

Market context

On 24 June 2026, Seoul will experience its highest recorded temperature at the Incheon International Airport Station, a metric that will determine the outcome of a prediction market where the crowd currently assigns zero probability to the “YES” side. This real-world event hinges on whether the day’s peak heat exceeds a specific Celsius threshold, with settlement finalising at 12:00 UTC on that date.

Historical data frames this near-zero probability as rational: June in Seoul typically sees daytime highs between 19°C and 28°C, with the average warmest day reaching just 26.7°C[1][7]. Even in 2026, forecasts indicate daily highs ranging from 82°F to 93°F (28°C–34°C), but extreme heat above 32°C remains rare before the monsoon intensifies in late June[1][5]. A recent Facebook post noted a high of 30°C on 24 June in a comparable year, yet dew points and humidity levels suggest manageable conditions rather than record-breaking extremes[3]. Traders should watch the Korea Meteorological Administration’s short-range forecasts for sudden spikes, as well as any announcements regarding heat advisories or urban cooling schedules that could influence local temperature readings[6]. The monsoon season’s onset—usually late June to mid-July—may bring rain that suppresses peak temperatures, further supporting the market’s current pricing[1][4].

When comparing platforms like Polymarket, Kalshi, Betfair, and Smarkets, divergences emerge in how this market is priced: decimal odds versus implied probability, fee structures, and KYC requirements. Polymarket often uses implied probability with lower fees but minimal KYC, while Kalshi mandates strict identity verification and offers regulatory-backed decimal odds. Betfair and Smarkets, operating as betting exchanges, allow users to set their own odds but impose higher commission rates. These structural differences can lead to pricing inefficiencies, especially in weather markets where data interpretation varies across books.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Seoul on June 24? 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

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.

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.

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.

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.