Busan June 11 High Temp: Will It Hit 28°C?

A single-day temperature forecast for Busan has become one of the more active short-duration weather markets on Polymarket right now. The contract asking whether Busan’s highest temperature on June 11 reaches exactly 28°C has surged sharply in the past 24 hours, with momentum indicators pointing firmly upward. The market currently prices a 52.5% implied probability that the daily maximum lands on that specific degree mark.

The market question is precise: does Busan’s highest recorded temperature on June 11 equal 28°C? The YES price sits at 0.53 and the NO price at 0.48, with resolution set for June 11 at 12:00 UTC. Total volume has reached $16,507, with $12,811 traded in the last 24 hours alone.

How the 28°C Contract Works

This is a specific-outcome temperature market, not a range bet. YES pays out only if Busan’s June 11 high temperature is recorded at exactly 28°C. Any other temperature, whether 27°C, 29°C, or outside that band, resolves NO for this contract.

• YES (0.53): Busan’s June 11 maximum temperature is recorded at 28°C.
• NO (0.48): Busan’s June 11 maximum temperature is recorded at any other value, including 27°C, 29°C, 30°C, 26°C, or any other listed outcome.

The NO side covers a wide net. Busan’s actual high misses 28°C whenever regional weather systems push temperatures even one degree above or below. June in Busan sits in a transitional period between spring and the early monsoon season. Daily highs during this window vary meaningfully based on wind direction, coastal influence from the Korea Strait, and overnight lows carried into the morning. A marine layer or a northerly wind shift on June 11 could push the high to 26°C or 27°C. A stronger heat ridge could send it to 29°C or 30°C. Neither outcome pays YES.

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Momentum and Market Signals

The momentum composite here is unambiguous. The 28°C contract gained 11.5% in the past hour and 14.0% over the past 24 hours, with a trend score of 65.47. That cluster of signals points to a single driver: short-range weather forecast models are converging on a Busan high near 28°C for June 11, and traders are pricing that convergence in real time.

Volume of $12,811 in 24 hours against a total market of $16,507 confirms this market woke up today. Liquidity stands at $22,013, which is healthy for a single-day weather contract. Volume is below $1M, which means a meaningful bet could still move prices sharply. This market can reprice quickly if forecast models shift overnight.

Key Factors

• The 1-hour price change of plus 11.5% and 24-hour change of plus 14.0% both point toward fresh forecast alignment around 28°C, likely driven by model updates published on June 10.
• Busan’s June climatology shows typical daily highs in the 23°C to 28°C range during the first two weeks of June, making 28°C a historically plausible outcome rather than an outlier.
• The Korea Strait’s moderating effect on coastal temperatures keeps Busan cooler than inland Korean cities during early June, compressing the range of likely outcomes.
• With resolution at noon UTC on June 11, the window captures the morning warming period. Busan’s daily maximum typically occurs between 13:00 and 16:00 local time (KST), meaning resolution may occur before the true daily peak.
• Thin volume below $1M means late forecast revisions or a single large trade could move this contract several percentage points before resolution.

Lines Analysis: The 28°C Case

Short-range numerical weather prediction models updated June 10 appear to be pointing toward a Busan high in the 27°C to 29°C range. The sharp momentum toward YES suggests those models are clustering near 28°C specifically, with traders treating the midpoint of that range as the most likely single-degree outcome. The Korea Meteorological Administration’s automated observation network for Busan reports with enough precision to resolve this contract cleanly.

The case against YES does not require an extreme weather event. A half-degree model revision overnight pushes the expected high to 27°C or 29°C, and this contract resolves NO. Early June in Busan sees meaningful day-to-day variability. The arrival of the East Asian monsoon front, typically beginning in late June, can produce cloud cover and cooler temperatures if timed early. A single frontal passage on June 10 into June 11 could suppress the high below 27°C. Conversely, a stronger-than-forecast surface high pressure system could push temperatures to 29°C or 30°C.

Signals to Monitor

• Korea Meteorological Administration forecast updates for Busan published late June 10 or early June 11 will carry the most weight on short-range model consensus.
• Global Forecast System and European Centre for Medium-Range Weather Forecasts model runs showing 2-meter temperature values for Busan at 06:00 UTC June 11 will indicate the morning temperature base.
• Any shift in surface wind direction at Busan toward a southerly (warmer, marine) or northerly (cooler, continental) regime overnight changes the expected daily maximum.
• Resolution timing at 12:00 UTC (21:00 KST) suggests the market may resolve before Busan’s afternoon peak, which could affect whether the recorded high at noon reflects the true daily maximum.
• Competing outcome contracts for 27°C, 29°C, and 30°C on the same market will show real-time shifts in trader consensus as forecast models update.

The data points toward a market that has correctly identified 28°C as the single most probable outcome in a narrow range. Total volume of $16,507 reflects genuine short-duration trader interest, not deep conviction. The market is pricing forecast uncertainty, not a settled scientific fact. The gap between YES at 52.5% and NO at 47.5% is narrow enough that a single overnight model run could flip this contract before June 11 arrives.

LINES VERDICT

SLIGHT EDGE TO YES, MARKET REMAINS LIVE

Short-range forecast convergence near 28°C drives the current YES lean, but the margin is thin and the resolution window is short. One model revision before June 11 closes the gap entirely.

What the market says: At 52.5% implied probability, the market has priced 28°C as the most likely single-degree outcome but has assigned nearly equal weight to all other possibilities. With resolution on June 11 at 12:00 UTC, any forecast shift in the next 18 hours reprices this contract sharply.

Key unknown: The Korea Meteorological Administration’s June 11 morning forecast update for Busan and the 00:00 UTC global model runs are the single most important data inputs before this contract closes.

Scientific Context: Busan in Early June

Busan sits on the southeastern tip of the Korean Peninsula, flanked by the Korea Strait to the south and mountains to the north. This geography moderates temperature extremes. Early June historically produces daily highs between 23°C and 28°C for the city, with the warmest days tied to southerly flow from the East China Sea. The East Asian monsoon typically reaches Busan in late June, bringing cloud cover and precipitation that suppress afternoon maxima. June 11 falls just before that climatological shift, meaning clear-sky radiation days are still common and 28°C is well within the historical norm rather than an exceptional outcome.