Seoul Minimum Temperature June 11: 16°C Leads

Seoul’s overnight low for June 11 has become one of the sharpest short-term weather prediction markets on Polymarket right now. The 16°C outcome opened at 39 cents this morning and hit 65 cents by early afternoon on June 10. That is a 25-point swing in under 24 hours. The market is pricing uncertainty, not science — and right now the data is pointing hard at a single number.

The market question asks: what will the lowest temperature in Seoul be on June 11? The 16°C outcome sits at $0.65 YES and $0.36 NO, implying a 64.5% probability. The market closes at 12:00 UTC on June 11, 2026. Total volume stands at $16,701, with $15,619 of that arriving in the last 24 hours alone.

How the Seoul June 11 Temperature Contract Works

This contract resolves to one specific outcome: the official recorded minimum temperature in Seoul on June 11. Korea Meteorological Administration data determines resolution. The 16°C bracket wins if Seoul’s overnight and early-morning low lands exactly at 16°C on that date. All other brackets — 15°C, 17°C, 14°C, 18°C, and so on — are separate contracts trading in parallel.

• YES at $0.65 (64.5% implied probability): Seoul’s minimum temperature on June 11 registers at 16°C.
• NO at $0.36 (35.5% implied probability): Seoul’s minimum temperature on June 11 falls on any other value in the bracket set.

The NO side covers a wide field. Seoul records its minimum below 15°C or above 17°C, and this contract pays nothing. Early June in Seoul typically sees overnight lows in the 15°C to 19°C range as the pre-monsoon pattern establishes itself. The 16°C bracket wins only if the actual reading hits that narrow target. A forecast cluster tight around 16°C is what drove today’s price surge — any shift in the synoptic pattern toward warmer or cooler conditions would reprice this contract fast.

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Momentum and Market Signals

The momentum signal here is about as clean as it gets for a short-duration weather market. The 1-hour change came in at +19.5%, the 24-hour change at +25.5%, and the trend score sits at 82.86 out of 100. All three indicators point the same direction, and the driver is obvious: a forecast update tightening the overnight low range toward 16°C pulled capital into this bracket rapidly.

Total volume at $16,701 is modest in absolute terms, but the 24-hour figure of $15,619 tells the real story. Nearly all of this market’s activity landed today. Liquidity sits at $33,183, which means the order book has depth relative to volume — price moves here reflect genuine conviction shifts, not thin-book manipulation. Still, $16,701 total means a single large bet could swing the price meaningfully before resolution.

• The 1h and 24h price changes both exceeded 19%, reflecting a single directional catalyst — likely a fresh KMA or international model forecast run tightening the overnight low estimate to 16°C.
• Trend score of 82.86 puts this in the top tier of short-term momentum for science and weather markets on Polymarket as of June 10, 2026.
• Liquidity of $33,183 against $16,701 volume suggests the book can absorb additional flow without extreme slippage.
• The NO side at $0.36 still represents a 35.5% probability — meaningful for a narrow temperature bracket where one degree of forecast error flips the outcome entirely.

Lines Analysis: Seoul Overnight Low on June 11

The data doesn’t care about the politics, and weather markets are the purest expression of that principle. The case supporting 16°C rests entirely on what numerical weather prediction models are outputting for Seoul’s overnight low on June 11. When multiple independent model runs converge on the same number, prediction markets respond exactly like this one did today — rapid price discovery toward the modal forecast. The Korea Meteorological Administration’s local model and the global ensemble systems (ECMWF, GFS) carry the most weight for Seoul near-term forecasts. A tight forecast distribution centered on 16°C with low spread is the only explanation for a 26-cent price jump in one session.

What keeps the NO side alive is forecast uncertainty within a narrow temperature corridor. Seoul’s June overnight lows are genuinely sensitive to cloud cover timing, urban heat island variation, and the exact timing of any surface trough passage. A one-degree model error — entirely normal at 24-hour range — shifts the outcome to 15°C or 17°C. The 16°C bracket is not asking whether it will be warm or cold. It is asking whether the measurement lands on one specific rung of the ladder.

• KMA official forecast update for June 11 overnight: any revision toward 15°C or 17°C would immediately reprice the NO side higher.
• ECMWF and GFS ensemble spread for Seoul June 11: tightening spread supports current 16°C pricing; widening spread raises NO probability.
• Actual overnight surface observation from Seoul’s Jongno or Nowon stations: real-time data in the early hours of June 11 will anchor final resolution.
• Synoptic pattern: any unexpected trough or ridge amplification over the Korean Peninsula before June 11 midnight local time changes the outcome distribution.
• Urban heat island effect: Seoul’s dense urban core can keep lows 1-2°C above surrounding areas, which matters when the bracket is this narrow.

Total volume of $16,701 is thin enough that this market reflects a small number of informed traders, not broad consensus. The data currently favors the 16°C outcome, but the margin for error in a single-degree temperature bracket is always real. Here’s what the measurements are telling us: the forecast is pointing at 16°C, the money followed, and the only thing that changes this before resolution is an updated model run or the actual overnight observation.

LINES VERDICT

NARROW FAVORITE, HIGH SENSITIVITY

Seoul’s June 11 overnight low is priced at 16°C because the current forecast centers there, but one-degree brackets resolve on razor-thin margins and a single model update can flip the outcome.

What the market says: At 64.5% implied probability, the market has real conviction in the 16°C outcome but is not treating it as certain. This is appropriate for a narrow temperature bracket with less than 24 hours to resolution. Volatility will peak in the final hours before the June 11, 2026 close as actual overnight observations come in.

Key unknown: The final KMA forecast update for Seoul on the evening of June 10 and the actual early-morning surface observation on June 11 are the only two data points that will determine resolution. Any shift in the model consensus away from 16°C reprices this contract immediately.

Scientific Context

Seoul sits in a temperate monsoon climate zone. Early June represents the pre-monsoon transition period, when overnight lows typically range between 15°C and 19°C. The city’s urban heat island effect tends to keep recorded minimums at central stations 1 to 2 degrees above rural surroundings. June 11 falls just ahead of the typical monsoon onset window for Seoul, which means synoptic variability is higher than mid-summer. Historical June 11 minimums in Seoul over the past decade cluster in the 14°C to 18°C range, making 16°C a historically plausible central estimate. The market pricing reflects this distributional reality.