Highest temperature in Seoul on June 23?

Platform comparison

Active sub-markets

Market context

On 23 June 2026, Seoul will experience its peak daily temperature at the Incheon International Airport Station, a metric that determines the outcome of a prediction market currently implying zero probability for any specific range. Historical data for late June in Seoul shows daytime highs typically climbing between 26°C and 29°C, with humidity rising as the monsoon season begins. AccuWeather forecasts for June 2026 indicate daily highs ranging from 83°F to 89°F (approximately 28°C to 32°C), while climate records suggest the warmest days often occur in the third week of the month, making the current 0% implied probability a stark divergence from seasonal norms[1][3].

Traders monitoring this event should watch for official announcements from the Korea Meteorological Administration regarding heatwaves or sudden shifts in the monsoon front, which could push temperatures above the historical average. Recent reports highlight that late June in Seoul can be noticeably hotter and more humid than early June, with a higher chance of rain that may temporarily suppress peak temperatures[2]. The resolution relies exclusively on Wunderground data for the Incheon station, creating a dependency on that specific platform’s uptime and accuracy, a nuance where platforms like Kalshi (which uses KYC and decimal odds) may offer more regulatory certainty compared to Polymarket’s implied probability model and lower fee structure[4].

The divergence between books is evident here: while Polymarket displays the current 0% implied probability, a Kalshi trader might see decimal odds reflecting a non-zero chance if the market maker adjusts for the late-June heat spike. Fee structures also vary, with Smarkets offering a commission-based model that could alter net returns compared to the flat fees on Betfair. Understanding these mechanical differences is crucial when assessing whether the 0% figure represents a genuine market consensus or a liquidity gap in a specific platform’s pricing engine[5][7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on June 23? 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 Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Is this market available outside the US?

Polymarket Alternative 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'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.

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.