Seoul April 28 Low Temp: Will It Hit Ten Degrees?

Seoul’s overnight temperature forecast for April 28 has become one of the sharpest short-term weather markets on Polymarket right now. The contract prices a 77% chance the city’s lowest recorded temperature lands exactly on 10°C. That is not a range. That is one degree. And the market moved hard to get there, gaining nearly 40% in 24 hours as forecast models converged.

The resolution date is 2026-04-28 12:00:00 KST. By then, the Korea Meteorological Administration will have logged the overnight minimum, and the contract closes. Everything rides on whether Seoul’s temperature floor lands on that single Celsius value.

How the Contract Works: Seoul’s April 28 Minimum Temperature

This contract resolves YES if the lowest temperature recorded in Seoul on April 28, 2026 falls exactly at 10°C. The Korea Meteorological Administration tracks official city temperature records and serves as the implied resolution source. Eleven competing outcomes span a full range, from 6°C or below up to 16°C or higher. Only one of them pays out.

• YES (10°C): Priced at 0.77, implying a 77% probability that Seoul’s April 28 minimum hits exactly 10°C.
• NO (any other outcome): Priced at 0.23, implying a 23% combined probability spread across ten alternative temperature buckets.

For the NO side to pay out, Seoul’s overnight low must land anywhere except 10°C. That means a warmer night pushing the floor to 11°C or above, or a colder snap pulling it to 9°C or below. Seoul’s late April climatology runs mild, with average overnight lows in the 9°C to 12°C band. A 1-degree deviation from the 10°C bin is entirely possible if a cold front arrives earlier than modeled or if the city retains heat longer than expected.

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A 40% Move in 24 Hours: What the Market Is Telling Us

The momentum composite here is unusually strong for a short-term weather contract. The 1-hour gain of +21.5%, a 24-hour gain of +39.5%, and a trend score of 84.74 all point to a single driver: numerical weather prediction models for Seoul converging on a 10°C overnight minimum for April 28. When forecast ensembles tighten around one value, traders reprice fast.

Total market volume sits at $14,181. The 24-hour volume of $12,469 means nearly all trading in this contract happened in the last day. Liquidity depth is $12,381. With total volume under $1 million, this market is thin. A single large order can shift the price sharply. The 77% price reflects strong conviction from a small number of active traders, not a deep liquid consensus.

• Seoul’s 1-hour price change of +21.5% combined with a 24-hour gain of +39.5% signals that forecast models moved decisively toward the 10°C bin within the last trading session.
• The trend score of 84.74 out of 100 reflects near-maximum directional momentum for a market this close to resolution.
• Total volume of $14,181 with $12,469 traded in 24 hours confirms this market activated late, concentrated around a forecast convergence event.
• Liquidity of $12,381 means the order book is shallow. New meteorological data arriving before 2026-04-28 12:00:00 could move price significantly with minimal capital.
• Open interest at $0 suggests no large unresolved positions are sitting on the book outside current bids and offers.

Lines Analysis: Seoul Temperature and the Forecast Signal

The Korea Meteorological Administration’s operational forecast models are the primary driver here. When short-range numerical weather prediction outputs for Seoul cluster tightly around 10°C for the April 28 overnight minimum, the 77% probability is a reasonable reflection of that model agreement. Late April in Seoul sits in a transitional window. Surface high pressure from the northwest typically keeps overnight lows in the 9°C to 12°C corridor, and the absence of any forecast cold surge supports the 10°C bin holding.

What makes the NO side real is the precision requirement. A 10°C resolution means the KMA-logged minimum must land in the 10.0°C to 10.9°C window (or exactly 10°C rounded, depending on resolution methodology). Seoul’s urban heat island effect can push overnight lows half a degree warmer than surrounding areas. If residual warmth from a cloudy evening holds the city floor at 11°C, or if a late cold front drops the minimum to 9°C, the market reprices sharply toward the NO side. The 23% NO probability is not noise. It reflects real meteorological variance at this precision level.

• KMA operational forecast: any model shift toward 9°C or 11°C bins before resolution would reprice the contract immediately.
• Cloud cover and wind: a cloudier night retains surface heat, pushing the minimum warmer. A clear night radiates heat faster, pulling it cooler.
• Cold front timing: any front arriving from the northwest earlier than modeled could drag the minimum below 10°C.
• Urban heat island variance: Seoul’s dense urban core can read 0.5°C to 1°C warmer than surrounding stations, affecting which temperature bin the official minimum falls into.

The $14,181 total volume places this in the low-liquidity tier. The data favors YES at 77%, but the single-degree precision of this contract means a small forecast revision can shift the market quickly before 2026-04-28 12:00:00. The market is pricing uncertainty, not science.

LINES VERDICT

Forecast Convergence Favors Ten Degrees

Seoul’s April 28 overnight minimum has the forecast models aligned. The market moved 40% in 24 hours because numerical weather prediction output converged on 10°C, and traders followed the signal.

What the market says: A 77% implied probability reflects strong but not certain conviction that Seoul’s overnight low lands at exactly 10°C. The thin liquidity means that conviction can unwind fast if the forecast shifts even slightly before the 2026-04-28 12:00:00 resolution.

Key unknown: The single most important input is the Korea Meteorological Administration’s final short-range forecast for Seoul on the evening of April 27. Any model revision moving the projected minimum to 9°C or 11°C would reprice this contract significantly before it closes.

Scientific Context: Seoul Late April Climatology

Seoul’s April 28 overnight minimum climatology centers on a 9°C to 12°C range across recent decades. The city’s location in the mid-latitude westerly belt means it is susceptible to both cold air intrusions from the northwest and warm advection from the Yellow Sea. Late April transitions are meteorologically active, which is precisely why single-degree temperature markets at this time of year carry more variance than markets in stable winter or summer regimes. The 77% price implies the current synoptic pattern is favorable for the 10°C bin, but the 23% NO probability honestly reflects how quickly Seoul’s overnight low can shift by a degree in transitional season conditions.

FAQ

• What does a 77% probability mean here? It means traders currently assign a 77 in 100 chance that Seoul’s April 28 overnight minimum is recorded at exactly 10°C by the Korea Meteorological Administration.
• How does the NO contract pay out? NO pays if Seoul’s lowest temperature on April 28 falls on any value other than 10°C. That includes 9°C, 11°C, or any other bin in the contract’s range.
• What data would move this price? A Korea Meteorological Administration forecast revision shifting the projected overnight minimum to 9°C or 11°C would reprice the contract sharply before the 2026-04-28 12:00:00 resolution.
• When does this contract resolve? Resolution is set for 2026-04-28 12:00:00 KST, after the overnight minimum has been officially recorded.
• Is the volume reliable? Total volume is $14,181, well below $1 million. Thin liquidity means the 77% price can shift sharply on a single large order or a new forecast update.

This analysis reflects market conditions as of 2026-04-27 15:12:52. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-04-28 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.