Highest temperature in Seoul on June 29?

Platform comparison

Market context

The real-world event hinges on the peak temperature recorded at Incheon International Airport on 29 June 2026, which will determine whether the market settles as a YES for the 24% crowd-implied probability range. This single data point from Wunderground will resolve the outcome, making the precise timing of the heatwave critical for any programmatically driven trader evaluating the tooling.

Historically, Seoul’s June highs typically climb from 77°F to 81°F, rarely exceeding 87°F, yet the capital shattered its all-time record in 2018 with 39.6°C amid a deadly heatwave that also set a national peak of 41.0°C in Hongcheon[2][3]. Recent June 2024 data showed record-breaking heat in 59 cities, with 29 June reaching 25.9°C as the highest ever for that date since 1907, suggesting that extreme outliers are plausible even in early summer[7]. A trader building a bot should weigh these comparable extremes against the current 24% probability, recognising that historical volatility often defies average expectations.

Key catalysts include the daily weather forecast schedules and any official heatwave announcements from the Korea Meteorological Administration, which often trigger conditional order adjustments in automated systems. Recent reports confirm South Korea is experiencing record-breaking June heat, with temperatures soaring across multiple regions and prompting public health warnings[6]. Traders monitoring this market programmatically must integrate real-time Wunderground feeds and cross-reference with national meteorological updates to capture the precise moment the temperature breaches the threshold, as settlement depends entirely on the highest reading for all times on that day.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on June 29? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Bot UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.