Seoul in mid-May experiences a spring-to-early-summer transition with increasing warmth and variable weather patterns. May 17, 2026 falls within this seasonal window when Seoul's average daily low temperatures typically range from 15–17°C, though year-to-year variation is notable. The specific question asks whether the lowest temperature on May 17 will be exactly 19°C—a narrow, precise outcome rather than a temperature range. The current 0% odds reflect strong trader conviction that this exact threshold will not be reached on that date. This belief likely stems from meteorological models pointing toward either warmer conditions (if warm Pacific air masses dominate) or cooler conditions (if a frontal system persists), but definitively away from the 19°C level. Seoul's May weather is shaped by competing pressure systems and air masses, creating substantial day-to-day variability in daily lows. The market's zero odds suggest current forecast ensembles heavily favor temperature outcomes outside the 19°C mark. Exact-temperature markets appeal to weather traders because they test forecast precision and probabilistic calibration rather than simple directional forecasting. A 0% odds reading indicates traders view 19°C as a statistical outlier given available meteorological guidance, making this a true precision bet on Seoul's daily minimum.
What factors could move this market?
Seoul's climate in May reflects the transition from spring's cool, variable conditions to early summer's warming trend. Historically, May 17 falls near the peak of Korea's spring season, with mean low temperatures around 15–17°C in Seoul, though specific daily values fluctuate based on synoptic-scale weather patterns. Seoul sits at roughly 37°N latitude, where May brings increasing solar forcing and gradually warming sea surface temperatures around the Korean Peninsula. The question targets 19°C specifically, which is roughly 2–4°C above the May 17 climatological normal for lows. Achieving exactly 19°C requires a narrow band of conditions: warm enough to push above the seasonal norm, but not so warm that the low exceeds 19°C. Several meteorological scenarios could push the overnight low higher: a ridge of high pressure anchored over the region, suppressing cloud cover and creating stable nocturnal conditions, or warm air advection from the south, reducing the diurnal temperature range. Conversely, scenarios pushing the low away from 19°C include a cold front passage bringing Arctic air, which would depress lows into the 10–14°C range, or sustained cloud cover and precipitation from a low-pressure system, which would limit diurnal swings and keep lows in the 13–16°C range. Historical May 17 data from Seoul shows considerable year-to-year variability; some years see lows as cool as 12°C following front passages, while others reach 18–20°C during warm high-pressure ridges. The 0% odds reflect either current numerical weather prediction models showing negligible probability for 19°C specifically, or trader consensus that the event is essentially ruled out by 24-hour forecasts. This conviction is rational given typical forecast uncertainty of ±3°C for 24-hour temperature extremes; if the median forecast low is 16°C with a standard deviation of 2–3°C, the probability mass at exactly 19°C becomes negligible. The market's zero odds also suggest no trader is willing to speculate that model bias or unexpected warming will deliver precisely 19°C, indicating high confidence in directional forecast consensus. Such exact-value markets serve meteorological professionals and weather derivatives traders seeking to isolate and hedge very specific forecast scenarios.
What are traders watching for?
Check Korea Meteorological Administration (KMA) forecast issued May 16; official low temperature prediction drives market.
Watch synoptic pattern May 16–17 UTC: high-pressure ridge or cold frontal position determines if low reaches 19°C.
Monitor Seoul ASOS station data in real-time May 17; official low temperature reading resolves market at 00:00 UTC.
Historical context: Seoul May 17 lows typically 15–17°C; 19°C would be warm outlier requiring sustained high-pressure ridge.
How does this market resolve?
Market resolves YES if Seoul's official lowest temperature on May 17, 2026 (per Korea Meteorological Administration) is exactly 19°C; NO if the low is any other value. Resolution closes 2026-05-17T00:00:00.000Z UTC.
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