Seoul June 3 Low Temp: 19°C at 44.5%

A single-day temperature market for Seoul is trading with real conviction right now. The 19°C outcome has climbed 22.5% in the past 24 hours, sitting at 44.5% implied probability as of June 2. That kind of move in a weather market this close to resolution means traders have found a signal they trust.

The market question asks: what will the lowest temperature in Seoul be on June 3? The 19°C outcome is priced at $0.45 YES, $0.56 NO, with resolution set for June 3 at 12:00 UTC. Total volume stands at $7,239, with $6,652 of that traded in the past 24 hours.

How the 19°C Contract Works

A YES resolution requires Seoul’s official minimum temperature on June 3 to register exactly 19°C. The Korea Meteorological Administration publishes daily minimum temperature readings for Seoul, and that dataset determines resolution. If the low lands anywhere other than 19°C, this contract pays NO.

• YES ($0.45): Seoul’s June 3 minimum temperature is exactly 19°C, implying a 44.5% probability.
• NO ($0.56): Seoul’s June 3 minimum temperature lands at any other value, implying a 55.5% probability.

The NO side is favored for a straightforward reason. Seoul’s early June overnight lows span a wide range. The alternative outcomes on this market include 16°C or below, 17°C, 18°C, 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, and 26°C or higher. The probability mass is split across all of them. Any single outcome winning at above 44% in a ten-outcome field represents genuine trader conviction.

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Momentum and Market Signals

The 24-hour price move tells the clearest story here. A 22.5% gain in a weather market with less than 36 hours to resolution reflects a directional shift in how traders read the incoming forecast. The trend score of 48.64 sits near neutral, but the price action says traders are leaning toward 19°C as the most probable single outcome in the field. The 1-hour change is flat, which suggests the move has stabilized rather than accelerated.

Total volume of $7,239 is thin by prediction market standards. The $6,652 traded in the past 24 hours represents nearly the entire market’s trading history, which means this contract essentially opened up on June 1 and June 2. Liquidity sits at $38,735, which is healthy relative to volume. But at this volume level, a single moderately sized trade can move price sharply. The current price reflects recent conviction, not deep consensus.

• The 24-hour momentum composite (plus 22.5%, trend score near 48) points to a weather forecast convergence driving the 19°C position higher.
• The 1-hour flat signal suggests the repricing has paused, with traders waiting for updated KMA or model output.
• Liquidity at $38,735 relative to $7,239 total volume means the order book can absorb new trades, but thin volume means each trade carries outsized price impact.
• The market opened at $0.41 on June 2 and has moved to $0.45, consistent with the 24-hour gain driven by forecast updates on June 1 and June 2.
• No whale trades are on record for this contract, so the price move reflects retail-level conviction rather than a single large position.

Lines Analysis: Seoul Minimum Temperature

Seoul in early June typically sees overnight lows in the 15°C to 22°C range, depending on the synoptic pattern. The 19°C outcome winning at 44.5% in a ten-outcome field means traders have found a tight forecast window. That kind of concentration usually reflects agreement between two or more major numerical weather prediction models. The Korea Meteorological Administration’s short-range model and the European Centre for Medium-Range Weather Forecasts both publish guidance for Seoul daily. When they agree on a narrow range, traders who track model output move first.

The NO side remains favored at 55.5%, and the math explains why. Even if 19°C is the single most likely outcome, ten outcomes sharing probability means the field beats any single pick most of the time. A small shift in the synoptic pattern, a cloud deck that holds longer than expected, or a wind direction change from the Yellow Sea could push the low to 18°C or 20°C. Seoul’s urban heat island effect tends to keep lows from dropping below 17°C in June, which compresses the field toward the 17-21°C range and makes 19°C a reasonable central estimate.

Signals to monitor before June 3 resolution:

• The Korea Meteorological Administration’s 00Z and 12Z model runs for June 2 will show whether the 19°C signal holds or shifts to an adjacent outcome.
• The ECMWF ensemble for East Asia, updated twice daily, is the highest-weight external signal for Seoul short-range temperature forecasting.
• Any shift in surface wind direction from southerly to northwesterly would lower the overnight minimum, pushing probability toward 17°C or 18°C.
• Cloud cover and humidity forecasts for the Seoul basin matter: a clear night radiates heat efficiently and could push the low below 19°C, while overcast skies trap warmth and support 20°C or 21°C.
• Resolution happens at 12:00 UTC on June 3, which corresponds to 21:00 KST on June 3. The KMA publishes daily minimum data for the prior day by early morning KST, so the resolution data will reflect June 3 overnight observations.

The $7,239 in total volume is too thin to treat as a deep-consensus signal. What the market is telling us is that a subset of traders with access to current model output sees 19°C as the most probable single outcome in this field. That’s a meaningful signal. It’s not certainty. Here’s what the measurements are telling us: the market is pricing a forecast, not a verified observation. That changes in the next 28 hours.

LINES VERDICT

Forecast-Aligned, Thin Market

The 22.5% price surge in 24 hours reflects real model-based conviction on 19°C as Seoul’s most likely overnight low. The thin volume means this is a sharp signal from a small number of informed traders, not broad market consensus.

What the market says: At 44.5% implied probability, 19°C is the leading single outcome in a ten-way field. That’s meaningful concentration. With resolution less than 36 hours away, any model update showing a shift to 18°C or 20°C could reprice this contract sharply given the low total volume of $7,239.

Key unknown: The Korea Meteorological Administration’s next model run for June 3 is the single data point that would reprice this contract. A 1°C shift in the overnight low forecast moves probability directly to an adjacent outcome.

Scientific Context

Seoul’s early June climate sits at a transition point between spring and the pre-monsoon period. The city’s average daily minimum for early June historically falls between 15°C and 20°C, with urban heat island effects pushing lows in the urban core approximately 1-2°C above suburban stations. The KMA’s Jongno or Seoul ASOS station is the reference point for resolution. Weather markets on single-day temperature outcomes in densely observed cities like Seoul tend to price efficiently in the final 48 hours as model consensus tightens. The data doesn’t care about the politics of which model you prefer. It cares about what happened overnight on June 3.

What events would move the price before resolution: A KMA or ECMWF model run shifting the Seoul overnight low forecast by even 1°C would transfer significant probability mass to an adjacent outcome. Clear skies and calm winds favor a lower low, potentially 17°C or 18°C. Cloudy, humid conditions favor 20°C or 21°C. The next 24 hours of forecast updates are the only remaining catalyst.

What is the probability percentage here, and what does it mean?

The 44.5% figure means traders believe there is roughly a four-in-nine chance the lowest temperature in Seoul on June 3 is exactly 19°C. In a ten-outcome field, that is the strongest single-outcome signal on the board.

What happens if the temperature is not exactly 19°C?

If Seoul’s official minimum on June 3 lands at any other value, such as 18°C or 20°C, the NO contract at $0.56 pays out. The NO side is favored at 55.5% precisely because hitting any single degree exactly is difficult even when the forecast is tight.

What data or event would move this market most?

The Korea Meteorological Administration’s model guidance for June 3, updated tonight and tomorrow morning KST, is the primary catalyst. Any shift in the forecast toward 18°C or 20°C would push capital to those adjacent markets and reprice the 19°C contract lower.

When does this market resolve?

Resolution is set for June 3, 2026 at 12:00 UTC. That is 21:00 Korea Standard Time on June 3. The KMA publishes daily minimum temperature data for Seoul stations by early morning KST, so resolution data will be available well before the cutoff.

Can thin volume make this market unreliable?

At $7,239 total volume with $6,652 traded in the past 24 hours, this is a thin market. The $38,735 in liquidity is healthy, but the low volume means a single trade of a few hundred dollars can move price meaningfully. Treat the price signal as informed but not deeply consensus-tested.