Highest temperature in Seoul on July 3?

Platform comparison

Market context

On 3 July 2026, the Incheon International Airport Station will record its highest temperature for the day, a figure that determines the outcome of a prediction market currently priced at zero per cent for the highest temperature range. This date sits at the precise end of monsoon season, a transition point that historically triggers rapid heat accumulation across the Korean peninsula. Meteorologists have already warned that this summer could be Korea’s hottest yet, with Seoul reaching 37.8°C earlier in July—the highest early-July temperature ever recorded since national data collection began in 1908[1].

Historical precedents frame the current probability starkly: in 2018, Seoul hit a record 39.6°C during an extreme heatwave that experts say resembles the current conditions[3]. Last year, heat wave alerts were raised to the highest “severe” level six days earlier than normal, with temperatures expected to pass 40°C for the first time[3]. The Korea Meteorological Administration forecasts that through 6 August, temperatures will remain above average with no significant rainfall, ensuring continued extreme heat and persistent tropical nights[3]. Given that cities like Gwangmyeong and Paju already saw daytime highs of 40°C on Tuesday, the zero per cent probability for the highest range appears inconsistent with the observed trajectory[1].

Traders must monitor daily Wunderground updates for the Incheon station, as the resolution source is explicitly the highest temperature recorded for all times on 3 July[7]. The critical catalyst is the official heat wave alert level, which has already been upgraded to warnings in most parts of the country[1]. Any announcement of temperatures exceeding 40°C in the Gyeonggi Province region will directly invalidate the current market pricing, as the forecast for July 2026 shows daily highs ranging from 81°F to 91°F (approximately 27°C to 33°C), with the average high at 85°F (29.4°C)[2]. The absence of significant rainfall and the presence of tropical nights suggest that the highest temperature range is far more likely than the market implies.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for Highest temperature in Seoul on July 3?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

FAQ

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