Seoul July 4 High Temp: Will 29°C Hit?

Seoul’s weather market for July 4 is a tight call priced at roughly one-in-three odds. The market has settled on 29°C as its leading outcome, but the spread across adjacent brackets tells the real story: traders see meaningful probability mass across a six-degree range from 27°C to 32°C. That kind of dispersion doesn’t reflect confidence. It reflects genuine meteorological uncertainty in a city where early July can swing hard.

The market question asks: what will the highest temperature in Seoul be on July 4? The 29°C bracket currently trades at $0.31 YES and $0.70 NO, implying a 30.5% probability. The market closes at noon KST on July 4, 2026. Total volume stands at $5,620, with all of that trading in the last 24 hours.

How the Seoul Temperature Contract Works

This contract resolves to YES if Seoul’s daily maximum temperature on July 4 lands exactly in the 29°C bracket. The resolution body for this market is Polymarket’s standard weather resolution process, which draws from official meteorological readings. Each adjacent bracket (28°C, 27°C, 30°C, and so on) is a separate contract trading simultaneously.

• YES at $0.31 pays out if Seoul’s July 4 high registers 29°C (approximately 84°F).
• NO at $0.70 pays out if Seoul’s July 4 high lands in any other bracket, from 23°C or below up to 33°C or higher.

The NO case here is structurally wide. Seoul records a 29°C maximum only when conditions align precisely: enough summer heat to break out of the mid-20s, but a cap below 30°C. A stronger heat dome pushes the high into 30°C or 31°C territory. A passing front or cloud cover drags it to 27°C or 28°C. The Korea Meteorological Administration’s July climatology shows daily highs during early July averaging between 27°C and 30°C, which is exactly why no single bracket commands the market.

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Momentum and Market Signals

The momentum composite here is flat. The 1-hour price change is 0.0%, the trend score sits at 32.16, and the 24-hour change data is not available from market open. The 29°C bracket opened at $0.30 and has barely moved, which suggests traders established their positions quickly and are now waiting on forecast updates rather than reacting to new information.

Total volume of $5,620 is thin. All of it came in the last 24 hours, indicating this is a newly opened market. Liquidity is $26,574, which is healthy relative to volume, but a single large bet or a sharp forecast update from the Korea Meteorological Administration could move the price meaningfully. When volume is this low, price can reprice fast on new data.

• The 29°C bracket holds a 30.5% probability, making it the single most likely outcome but still a minority position in a fragmented field.
• Price has been stable at $0.30 to $0.31, reflecting no strong directional conviction from traders.
• The 1-hour change of +0.0% and flat trend score confirm the market is in a holding pattern ahead of updated forecasts.
• Thin volume below $1M means any concentrated buying in the 28°C or 30°C brackets could shift relative pricing sharply.

Lines Analysis: Seoul in Early July

The Korea Meteorological Administration’s historical record for Seoul shows early July highs clustering between 27°C and 31°C. July 4 falls during the pre-monsoon or early monsoon window, when the Changma front can either suppress temperatures with cloud cover and rain or temporarily retreat and allow hot, humid air to push highs into the low 30s. The 29°C bracket captures roughly the middle of that historical range, which is why it leads the market without commanding it.

The competing scenario that breaks the 29°C bracket is straightforward. A stronger-than-expected heat dome or a delayed Changma front pushes Seoul’s high to 30°C or 31°C. Seoul has recorded multiple days above 30°C in early July in recent years, particularly during the anomalously warm summers of the early 2020s. Meanwhile, an early Changma onset with significant rainfall could cap the high at 27°C or 28°C. The resolution date is fixed: noon KST on July 4. There is no extension, and final meteorological readings from that day determine the outcome.

• The Korea Meteorological Administration’s short-range forecast for July 4 is the single highest-impact data point. Any forecast showing a 30°C or higher high would deflate the 29°C bracket sharply.
• Changma front positioning in the 48 hours before July 4 will determine whether cloud cover suppresses the high or retreats to allow full solar heating.
• Regional heat advisories from KMA, if issued for Seoul ahead of July 4, would push probability into higher brackets.
• Historical Seoul July 4 data from KMA’s climate records supports the 27°C to 31°C range as the realistic trading window.
• Any significant precipitation forecast for July 4 would shift probability toward the 26°C to 28°C range.

The $5,620 in total volume is too thin to treat the 29°C bracket’s 30.5% price as a strong signal on its own. The market is pricing meteorological uncertainty across a wide range. The data from KMA short-range forecasts will matter far more than current trader positioning. No bracket commands a majority. The measurement window closes at noon KST on July 4.

LINES VERDICT

FRAGMENTED FIELD, WATCH THE FORECAST

Seoul’s early July temperature window is genuinely wide, and the 29°C bracket leads only because it sits at the center of the historical range. The market is pricing uncertainty, not science.

What the market says: At 30.5% implied probability, traders rate 29°C as the single most likely outcome but still a minority call. Thin volume below $1M means this price can move sharply on any updated KMA forecast before the July 4 noon resolution.

Key unknown: The Korea Meteorological Administration’s 24-to-48-hour forecast for Seoul on July 4 is the single event that will reprice every bracket in this market. Changma front positioning is the meteorological variable that matters most.