Seoul Hit 28°C on July 10, 2026 | Lines.com

Seoul recorded a high of 28°C on July 10, 2026, confirming the Polymarket temperature prediction for South Korea’s capital. The reading resolved this multi-outcome market in favor of the 28°C bucket, closing out all competing ranges from 21°C and below through 31°C and higher. Measurement confirmation arrived intraday on July 10, driving the market to full settlement.

Traders priced 28°C at just 29% implied probability when the market opened. That opening price reflected genuine uncertainty across a wide temperature distribution spanning more than a dozen discrete outcomes. The final confirmed reading proved the 29% opening price a significant underestimation. More than $107,000 of the total $130,988 in volume arrived in the final 24 hours as the market snapped toward certainty.

Seoul’s July 10 Temperature: How the 28°C Outcome Was Confirmed

Seoul’s measured daily high on July 10, 2026, landed at 28.9°C, placing the result squarely in the 28°C resolution bucket. The Korean Peninsula sits in its peak monsoon window in early July, a period when daily highs fluctuate sharply depending on cloud cover, precipitation, and moisture advection from the Yellow Sea. On July 9, forecasts were pointing toward a high around 26°C, a reading that would have resolved the market in a lower bucket entirely. Overnight conditions shifted. July 10 brought warmer and drier air, pushing the actual high nearly 3°C above the previous day’s forecast.

Market pricing tracked this forecast uncertainty directly. The 28°C contract dropped 6.5% on July 9 as cooler-than-expected forecasts circulated. Then on July 10, intraday measurement data confirmed the warmer reading, and the contract surged 63.5% within the hour to reach full settlement at 100%. Open interest fell to zero as positions settled.

How the Market Performed on Seoul’s July 10 Temperature

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The 28°C outcome resolved YES against an opening implied probability of 29%. That gap is the defining story of this market. Traders distributed conviction across a wide outcome space, none of the individual temperature buckets commanded majority confidence at open. The 29% opening price was not irrational given the forecast uncertainty on July 9. It was, however, deeply underpriced once the weather pattern shifted overnight.

Total volume reached $130,988, with $107,051 arriving in the final 24 hours. That late-stage volume concentration confirms traders were actively repricing as real-time weather data came in rather than taking early positions. Liquidity of $346,851 kept spreads tight and allowed the market to reflect forecast shifts efficiently.

• Resolution Outcome: 28°C confirmed as Seoul’s July 10, 2026 daily high.
• Article-Time Probability: 29% implied probability at market open.
• Final Price at Close: 100% (settled at 1.00 on resolution).
• Total Volume: $130,988, with 82% arriving in the final 24 hours.
• Market Assessment: Underpriced YES. The 28°C outcome was correct but opened at less than one-in-three odds.

What Seoul’s July 10 Temperature Means for Regional Weather Markets

Seoul’s 28°C reading was not an isolated data point. The strong positive correlation between this market and the ‘Highest temperature in Hong Kong on July 10?’ market suggests a regional atmospheric pattern drove above-forecast temperatures across East Asia on July 10. That kind of regional coherence is useful context for traders watching similar daily temperature markets during the East Asian monsoon season. July in Seoul carries baseline variability that can swing 5°C or more within a week, a range wide enough to spread probability across many outcome buckets simultaneously.

The binary structure of each individual temperature bucket captures that variance well in theory, but the 29% opening price illustrates a real limitation. Traders faced a 12-outcome distribution and spread capital across it. No single bucket starts with majority odds in that architecture, regardless of underlying meteorological probability. The market resolved correctly, but the opening price reflected structure as much as it reflected genuine climatological skepticism about a 28°C reading in early July Seoul.

• Seoul’s July daily highs average between 23°C and 28°C, placing the 28°C outcome at the upper end of the typical monthly range.
• The overnight forecast shift on July 9 to July 10 shows how much single-day temperature markets depend on short-range model accuracy, not climatological averages.
• The East Asian monsoon correlation between Seoul and Hong Kong temperature markets suggests grouped regional positioning strategies may improve pricing efficiency in future markets.
• High liquidity at $346,851 against modest total volume of $130,988 indicates market makers were providing depth that traders did not fully engage until confirmation was imminent.

LINES RESOLUTION VERDICT

UNDERPRICED YES

Seoul’s July 10 high of 28°C confirmed the YES resolution, but the market opened at 29% implied probability, meaning the correct outcome was a significant underdog at open. The data doesn’t care about the politics, and it doesn’t care about opening prices either.

What the market showed: A 29% opening implied probability against a confirmed YES resolution. Final settlement reached 100% after real-time measurement data arrived on July 10, representing a full repricing from underpriced to resolved within the final trading hours.