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, a metric that will determine whether the prediction market resolves to the highest temperature range. Current crowd-implied probability sits at 22% for a "YES" outcome, suggesting traders view extreme heat as unlikely despite Seoul’s tendency for rising June temperatures. Historical data shows daily highs in Seoul typically climb from 77°F to 81°F (25°C to 27°C) during June, rarely exceeding 87°F (31°C) [1]. However, recent years have shattered norms: South Korea recorded an all-time high of 41.0°C (105.8°F) in Hongcheon in 2025, while Seoul itself hit 39.6°C (103.3°F) in August 2018, topping its prior record [2][3]. A 2025 report noted record-breaking June heat across 59 cities, with 30 June marking the hottest June day since 1904 [5]. These outliers frame the current 22% probability as a cautious bet against a repeat of such extremes, given Incheon’s coastal location often moderates peaks compared to inland stations.

Traders should monitor emerging weather forecasts for the Korean Peninsula, particularly any announcements of heatwaves or monsoon delays that could elevate temperatures. The settlement window ends at 12:00 UTC on 29 June 2026, with resolution sourced from Wunderground’s daily high for Incheon Airport [2]. Recent news highlights South Korea’s vulnerability to deadly heatwaves, with authorities issuing warnings amid record temperatures [7]. Analyst consensus diverges from sportsbook lines: while some bookmakers offer odds implying a 30% chance of extreme heat, prediction markets reflect a lower 22% probability, suggesting a more conservative outlook. This divergence may stem from Incheon’s proximity to the sea, which historically buffers temperature spikes compared to inland areas like Hongcheon. Traders must weigh these dependencies against the broader trend of intensifying summer heat in the region, as evidenced by the 2025 record-breaking June [5]. No moralising on trading is needed; the facts alone guide the assessment.

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 Best Prediction Markets, 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

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 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.

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.