Highest temperature in Seoul on June 27?

Platform comparison

Active sub-markets

Market context

On 27 June 2026, Seoul will experience its peak daytime temperature, a critical real-world variable for the prediction market resolving at Incheon International Airport. Historical data shows June in Seoul is warm but not extreme, with average highs between 19°C and 28°C, though recent records indicate spikes up to 34°C on 19 June 2026[1][10]. The crowd-implied probability of 0% YES suggests traders believe the temperature will fall outside the specific range offered, likely because June typically remains below the intense heat of midsummer, which only arrives with the monsoon season from late June to mid-July[1][2].

Traders should monitor the onset of the monsoon season, which often brings increased humidity and afternoon showers that can suppress peak temperatures, alongside any sudden heatwave announcements from the Korea Meteorological Administration[2]. Recent news from MBC highlights a daytime high of 32°C on 27 June 2026, indicating that while extreme heat is possible, it remains an outlier compared to the seasonal average of 28°C[9]. When comparing platforms like Polymarket and Kalshi, note that Polymarket displays decimal odds while Kalshi uses implied probability, and their fee structures and KYC requirements diverge significantly, affecting liquidity and execution for this specific weather event[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on June 27? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

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.

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.