Highest temperature in Seoul on June 23?

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Market context

The underlying event is the daily peak temperature at Incheon International Airport on 23 June 2026, a date that sits at the cusp of Seoul’s early summer warmth and the onset of the monsoon season. Historical patterns show June daytime highs in Seoul typically range from 19°C to 28°C, with late June becoming noticeably hotter and more humid as rain increases [1][2]. AccuWeather forecasts for June 2026 indicate daily highs between 83°F and 89°F (approximately 28°C to 32°C), with an average high of 86°F (30°C) [3]. Given this consistent thermal ceiling, the current 0% implied probability for any temperature exceeding the market’s upper threshold appears misaligned with climatological reality, suggesting a significant divergence between prediction-market odds and analyst consensus on seasonal norms.

Traders should monitor the Korea Meteorological Administration’s short-range forecasts for 23 June, particularly any shifts in humidity or precipitation probability that could suppress peak temperatures [4]. The monsoon season usually begins in late June, and heavy rain events can temporarily lower daytime highs despite rising seasonal averages [5]. Recent weather guides note that early June is more comfortable, while late June brings higher heat and humidity, making the specific timing of the 23 June forecast critical [2]. No major weather announcements are scheduled beyond routine meteorological updates, but the dependency on real-time humidity data remains the primary catalyst for price movement. The 0% market probability fails to account for the natural variability in late-June weather, where temperatures can occasionally breach 30°C even with rain, creating a clear arbitrage opportunity against the current odds.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

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FAQ

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On Best Prediction Markets, 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.

Is this market available outside the US?

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What does it cost to trade on Best Prediction Markets?

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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.