Seoul July 4 Low Temp: Will It Hit Twenty-Two Celsius?

Seoul’s overnight low on July 4 is now the subject of a live prediction market, and one specific number has taken the lead. The market prices a 22°C minimum at 53.5% probability. That’s a slim majority, but the contract has moved sharply upward today, suggesting traders are aligning around a narrow temperature band heading into the resolution window.

The market question asks: what will be the lowest temperature in Seoul on July 4, 2026? The YES contract for 22°C sits at $0.54. The NO contract sits at $0.47. The market resolves July 4, 2026 at noon. Total volume stands at $8,241, with $8,256 traded in the last 24 hours, meaning nearly all activity is fresh.

How the Twenty-Two Celsius Contract Works

This is a scalar temperature market. YES resolves if Seoul’s verified minimum temperature on July 4, 2026 falls exactly at 22°C. NO covers every other outcome: 21°C, 23°C, 24°C, 20°C, 25°C, 19°C, 18°C or below, 26°C, 27°C, or 28°C and higher. The full outcome ladder spans a wide range, but the market has concentrated its probability on a tight cluster.

• YES (22°C): $0.54 per share, 53.5% implied probability.
• NO (any other temperature): $0.47 per share, 46.5% implied probability.

The NO side wins if Seoul’s low lands anywhere but 22°C. Early July in Seoul typically sees overnight lows between 20°C and 25°C, with the average minimum for the first week of July hovering near 22°C to 23°C based on the city’s historical summer climate. A reading of 21°C or 23°C would be entirely plausible and would pay out NO holders. The probability gap between YES and NO is only seven percentage points. That is not conviction. That is a coin toss with a slight lean.

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Momentum and Market Signals

The momentum composite here is striking for a market of this size. The 1-hour price change is plus 2.5%, and the trend score sits at 47.94. Combined, these signals point to a market that is actively repricing today, likely as traders incorporate the latest Seoul weather forecast data ahead of the July 4 window. That kind of intraday movement on a temperature market usually means new forecast information has entered the conversation.

Total volume is $8,241. The 24-hour volume of $8,256 exceeds total volume, which confirms this market essentially launched and filled within the last day. Liquidity stands at $24,945, which is healthy relative to volume. However, with under $10,000 in total volume, this is a thin market. A single large trade can move the price sharply. The current 53.5% probability should be read as a directional signal, not a precise calibration.

• The 1-hour price gain of plus 2.5% signals active repricing tied to incoming forecast data for Seoul on July 4.
• The trend score of 47.94 reflects moderate positive momentum, not a runaway signal.
• Liquidity of $24,945 is strong relative to volume, but sub-$10,000 total volume means prices can move fast on small trades.
• The YES/NO split of 53.5% to 46.5% reflects a genuinely uncertain outcome, not a settled market.
• All meaningful volume entered today, meaning the current price reflects only the most recent information available.

Lines Analysis: Seoul Temperature on July 4

Here’s what the measurements are telling us. Seoul sits in a humid continental climate zone with hot, humid summers. Early July overnight lows cluster between 21°C and 24°C in most years. The 22°C outcome has the highest single-outcome probability in the market, which makes sense as a near-average value. Korea Meteorological Administration forecasts and international model ensembles (GFS, ECMWF) are the primary data sources traders are likely watching. When those models converge on a 22°C low, the YES price rises. When they diverge or point to 23°C or higher, it falls.

The market is pricing uncertainty, not science. The honest challenge for YES holders is that temperature forecasts at three days out carry meaningful error bands, often plus or minus 1°C to 2°C. Seoul’s July 4 low landing at 23°C instead of 22°C would be an entirely unremarkable meteorological outcome. That one-degree shift would flip the entire contract. NO does not require a dramatic weather event. A slightly warmer or cooler overnight is enough.

• Korea Meteorological Administration issues updated Seoul forecasts twice daily. Any shift in the predicted minimum toward 21°C or 23°C would reprice this market immediately.
• GFS and ECMWF model agreement on 22°C would strengthen YES. Model divergence weakens it.
• Humidity and cloud cover overnight on July 3 to 4 directly affect the minimum temperature. A cloudy night traps heat and nudges the low upward toward 23°C or 24°C.
• Urban heat island effects in central Seoul tend to keep overnight lows slightly above regional averages, which supports the 22°C to 24°C range.

Total volume of $8,241 shows this is a niche market with engaged but limited participation. The data currently favors 22°C as the single most likely outcome. But with a 53.5% probability and a resolution just two days away, the remaining uncertainty is real and unresolved. The data doesn’t care about the politics, and in this case, the data is still genuinely uncertain.

LINES VERDICT

SLIGHT LEAN TOWARD TWENTY-TWO CELSIUS, HIGH UNCERTAINTY

The market has correctly identified 22°C as the most probable single outcome for Seoul’s July 4 low, but a 53.5% probability in a multi-outcome market means nearly half the probability mass sits elsewhere. The forecast window is short, and one model update changes everything.

What the market says: A 53.5% implied probability means the market sees 22°C as the most likely outcome but holds significant uncertainty. With resolution on July 4, this price will move sharply as the 48-hour forecast firms up.

Key unknown: The Korea Meteorological Administration’s next forecast update and the final 48-hour ensemble model output for Seoul are the single most important data inputs. Any shift to a 23°C predicted low reprices this contract immediately.