Busan May 11 Temperature: Will the High Hit 24°C?

The prediction market for Busan’s May 11 high temperature has moved with unusual force. The 24°C outcome contract has surged from 0.29 at open to 0.79 today, with a 36% jump in the last hour alone. That kind of momentum in a short-horizon weather market signals one thing: the forecast data converged sharply, and traders followed the weather models.

Here’s what the measurements are telling us. South Korea’s Korea Meteorological Administration has Busan in a mild, seasonally typical pattern for mid-May. Synoptic conditions favor daytime highs in the low-to-mid 20s Celsius, with sea breeze moderation keeping temperatures from spiking into the 26°C-plus range. The 24°C contract is now trading at 78.5% implied probability, with 22% of the market holding out for adjacent outcomes.

How the 24°C Busan Contract Works

This market resolves based on the official highest temperature recorded in Busan on May 11, 2026. The resolution window closes at 2026-05-11 12:00:00 UTC. The contract pays out if the observed daily maximum at the Busan weather station lands exactly at 24°C. Every other outcome, including 23°C, 25°C, and the 26°C-or-higher band, is a separate tradeable contract.

• 24°C (YES): 0.79 price, 78.5% implied probability
• All other outcomes (effective NO): 0.22 price, 21.5% implied probability

The adjacent outcomes are where the NO logic lives. For the 24°C contract to miss, Busan’s official maximum would need to land at 23°C or below, or push into 25°C or higher. Sea breezes off the Korea Strait typically cap afternoon highs in Busan during May, which compresses the probability of the 26°C-plus outcome. The 23°C outcome is the more credible alternative, especially if cloud cover holds through the afternoon hours.

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Momentum and Market Signals Point to Settled Conviction

The momentum composite here is striking. A 36% one-hour price jump, a 43% gain over 24 hours, and a trend score of 86.87 together form a single signal: weather model output shifted decisively in the last 24 hours, and the market repriced to match. This pattern is common in short-duration weather markets when a high-resolution forecast run drops and traders respond to the updated probability distribution.

Total volume stands at $26,181, with $21,806 of that trading in the last 24 hours. That means nearly all of the market activity is fresh, concentrated in the period when the forecast signal clarified. Liquidity is listed at $680,443, which is deep relative to volume. With total volume under $1 million, a single large order could still move the price meaningfully if new forecast data creates doubt. The market is pricing uncertainty, not science, and thin-volume weather markets can reprice fast.

Key Factors

• The 1-hour price change of +36.0% and 24-hour change of +43.0% reflect a unified forecast convergence signal, not incremental drift.
• Busan’s coastal geography historically moderates May highs, making the 24°C-25°C band the modal outcome in mid-May climatology.
• The 24°C contract has reached its 30-day high of 0.79 today, implying the current forecast run is the strongest signal the market has seen this cycle.
• Adjacent outcomes (23°C, 25°C) remain non-trivial. Forecast uncertainty within a single degree Celsius is real at 12-24 hour range.
• Resolution closes at 2026-05-11 12:00:00, leaving minimal time for the market to absorb a forecast revision before settlement.

Lines Analysis: Busan Temperature Contract

The Korea Meteorological Administration’s short-range forecast for Busan on May 11 is the primary signal supporting the 24°C outcome. Mid-May climatology in Busan centers on highs between 19°C and 24°C, with the upper end of that range occurring when southerly flow dominates. Current synoptic patterns align with the warmer side of the seasonal envelope. The rapid price movement in the last 24 hours suggests at least one high-resolution model run came in tightly clustered around 24°C, which would explain the market’s conviction.

The 23°C outcome is the most credible alternative. Afternoon cloud cover or a stronger-than-expected sea breeze could hold the maximum below 24°C. The 25°C outcome requires a warmer air mass than current models indicate. Neither condition is impossible at this forecast range, but neither is favored by the available data. Weather markets at this resolution are notoriously sensitive to the final forecast run, and a revision toward 23°C or 25°C in the next few hours would reprice both contracts immediately.

Signals to Monitor

• Korea Meteorological Administration afternoon forecast update: any shift in the predicted Busan high for May 11 would directly reprice the 24°C contract.
• Weather model ensemble spread: if the ECMWF or GFS models diverge from the KMA forecast, uncertainty rises and the 0.79 price could soften.
• Sea breeze intensity: stronger-than-forecast maritime flow in Busan would push the outcome toward 23°C and away from 24°C.
• Synoptic warm air advection: any late-breaking southerly surge would push probability toward 25°C and compress the 24°C contract’s edge.
• Observation time: the resolution window closes at 2026-05-11 12:00:00, so the final hour of trading will incorporate the most current forecast data available.

The total volume of $26,181, with $21,806 arriving in the last 24 hours, tells you the market found its price late. The data currently favors the 24°C outcome, but a one-degree weather forecast carries real uncertainty. Traders holding alternative outcomes are not wrong to wait for the final KMA model run.

LINES VERDICT

Forecast Convergence Favors Twenty-Four Degrees

The market has moved aggressively toward 24°C because the available forecast data supports it. The coastal climatology, synoptic pattern, and model consensus all point to that outcome as the modal result for May 11 in Busan.

What the market says: 78.5% of contract value sits on the 24°C outcome as of 2026-05-10 23:10:22, reflecting a decisive but not certain forecast signal. With resolution at 2026-05-11 12:00:00, any final-hour model revision could introduce meaningful price volatility in a market where volume is under $1 million.

Key unknown: The Korea Meteorological Administration’s next high-resolution forecast run for Busan on May 11 is the single most important data point remaining. A shift of even one degree in the predicted maximum would reprice the 24°C, 23°C, and 25°C contracts simultaneously.

Scientific Context

Busan’s position on the southeastern tip of the Korean Peninsula gives the city a maritime climate that moderates temperature extremes. May is a transitional month: the winter monsoon has retreated, but the summer monsoon has not yet established. The historical average daily maximum for Busan in mid-May sits near 20°C to 22°C, with warmer years pushing toward 24°C to 25°C when southerly flow is active. The current market pricing of 78.5% for 24°C implies the forecast is calling for the warmer end of the seasonal range, which is consistent with recent years of above-average spring temperatures across the Korean Peninsula. Before 2026-05-11 12:00:00, the event that would move this contract most is a KMA forecast update placing the expected high at 23°C or 25°C rather than 24°C.

Frequently Asked Questions

• What does 78.5% probability mean here? The market is saying there is roughly a 78.5% chance the official Busan maximum temperature on May 11 will be recorded as exactly 24°C. That probability can shift quickly as new forecast data arrives before the 2026-05-11 12:00:00 resolution.
• What happens if the temperature lands at 23°C or 25°C? The 24°C contract pays nothing. Traders holding the 23°C or 25°C contracts would receive their payout instead. Each temperature outcome is a separate market.
• What single data release would most move this price? A Korea Meteorological Administration forecast update revising the Busan May 11 high above or below 24°C would reprice this contract immediately and materially.
• When does this market resolve? Resolution is set for 2026-05-11 12:00:00, based on the official high temperature recorded at the Busan weather station on May 11, 2026.
• Is the volume reliable for price discovery? Total volume of $26,181 is thin. Liquidity is listed at $680,443, which is deep relative to trading activity, but a single large order could still move the price sharply before resolution.