Shanghai June 11 High Temp: Will 31C Hold?

Shanghai’s weather market just moved fast. The contract for a 31°C high on June 11 has surged from 24 cents to 78 cents in under 24 hours. The market is pricing uncertainty, not science, but right now the momentum is pointing hard in one direction.

The market question asks: will Shanghai’s highest temperature on June 11 reach exactly 31°C? The YES price sits at $0.78 and NO at $0.22, implying a 78% probability. The contract resolves at 12:00 UTC+8 on June 11, 2026. Total volume has hit $75,414, with $67,546 of that traded in the last 24 hours alone.

How the 31°C Contract Works

This contract resolves YES if Shanghai’s official daily maximum temperature on June 11, 2026 is recorded at exactly 31°C. The alternative outcomes, including 30°C, 32°C, 33°C, 34°C, 35°C or higher, and every degree from 25°C down, each trade as separate contracts. Resolution follows official meteorological records for Shanghai.

• YES ($0.78, 78% implied probability): Shanghai’s June 11 high temperature registers at 31°C on the official record.
• NO ($0.22, 22% implied probability): Shanghai’s June 11 high lands at any other temperature, from 30°C or below to 32°C or above.

The NO side pays out across a wide range of outcomes. Shanghai could overshoot to 33°C or 34°C, which would be well within June norms during a heat pulse, and NO collects. Shanghai could also undershoot to 29°C or 30°C if cloud cover or a weak trough suppresses afternoon heating. June in Shanghai runs warm, with average highs typically sitting in the low-to-mid 30s, so the real risk to YES is a stronger-than-expected heat event pushing the reading above 31°C, not a cool day.

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Momentum and Market Signals

The momentum composite here is unusually sharp. A 28.5% move in the last hour, a 46.5% move over 24 hours, and a trend score of 86.88 all point to the same driver: traders have updated hard on short-range weather model output showing June 11 conditions aligning closely with a 31°C outcome. That kind of synchronised intraday move usually reflects a specific forecast signal, not diffuse sentiment.

Total volume of $75,414 is thin by prediction market standards, and $67,546 of that came in the last 24 hours. Liquidity of $152,862 is reasonable relative to volume, but this is still a small market. Thin liquidity means price can move sharply on even modest new data. A late model run showing 32°C or 30°C could reprice this contract quickly before resolution.

• The 1-hour and 24-hour price changes together signal a single decisive repricing event, most likely a weather model update for June 11 Shanghai.
• Trader sentiment is strongly bullish at 78% YES, 22% NO, with no whale trades on record to anchor conviction independently.
• Volume below $1M means this market is vulnerable to sharp moves from a single large bet or a new forecast run.
• The contract opened at $0.24 and has nearly tripled in value within the trading day, an unusually fast move for a one-day temperature market.
• Related markets show no strong correlation signal. The nearby science markets track multi-month or annual phenomena, not daily local temperature.

Lines Analysis: Shanghai June 11

Here’s what the measurements are telling us. June is Shanghai’s transition into its hottest season. The city’s average daily maximum in early June typically sits between 29°C and 33°C, with significant day-to-day variance driven by the East Asian monsoon front, sea breeze effects, and synoptic-scale pressure patterns. A 31°C outcome falls squarely in the climatological middle of that range. That is exactly why this contract is interesting: it is not a question of whether Shanghai will be warm. It is a question of whether warmth lands at a specific integer.

The risk to this contract is precision, not direction. Shanghai’s afternoon high on any given June day is as likely to finish at 32°C as at 31°C. The data doesn’t care about the politics of the trade. A stronger subtropical ridge pushes readings above 32°C. A lingering marine layer or early monsoon cloud keeps the peak at 29°C or 30°C. Both outcomes collapse YES. The narrow YES band, exactly one degree, is the structural challenge here, and a 78% price implies the market believes recent model runs have pinned the forecast tightly.

Signals to monitor:

• Shanghai Meteorological Bureau official forecast updates for June 11: any revision toward 32°C or above would push YES lower immediately.
• European Centre for Medium-Range Weather Forecasts (ECMWF) and National Centers for Environmental Prediction (NCEP) deterministic model output for Shanghai on June 11: agreement between models near 31°C supports current pricing.
• Ensemble spread on the June 11 Shanghai forecast: a tight ensemble around 31°C justifies the 78% price. A wide spread weakens it.
• Early morning surface observations from Shanghai on June 11: overnight low temperature and morning cloud cover are leading indicators for afternoon maximum.
• Any regional synoptic pattern shift, specifically a trough or cold front approaching the Yangtze Delta, would be the clearest bearish catalyst for this contract.

Total volume of $75,414 with $67,546 arriving in 24 hours reflects a market that woke up to this contract late. The sharp repricing suggests new information entered the market, most likely a model update. The data currently favors YES, but the one-degree precision requirement keeps NO competitive at 22%.

LINES VERDICT

Conditional Lean YES, Precision Risk Remains Real

The market repriced hard on what looks like a converging weather model signal for 31°C on June 11. The climatological range supports a warm day in Shanghai, and the forecast appears to have narrowed around this specific threshold.

What the market says: At 78% implied probability, the market has strong but not settled conviction on the 31°C outcome. This is a short-duration market resolving within hours. Volatility from a single model update or early observation could move price sharply before the June 11 noon cutoff.

Key unknown: The final short-range model run for Shanghai on June 11, and the early morning surface temperature observation from the city, are the two data points that will determine whether YES holds or collapses to an adjacent outcome contract.

Scientific Context: Shanghai Temperature Distribution in Early June

Shanghai sits on the Yangtze River Delta, where early June temperatures are governed by the advancing East Asian summer monsoon. The climatological daily maximum for Shanghai in the first two weeks of June averages approximately 30°C to 32°C, based on long-term station records. Single-degree precision markets like this one are structurally harder to price than threshold markets because integer rounding means the difference between a 30.6°C reading and a 31.4°C reading determines resolution. The current 78% price implies traders have high confidence in the forecast, but June weather in Shanghai carries meaningful day-to-day variance driven by synoptic systems that can shift afternoon peaks by 2°C to 3°C within hours.

What would move price before the June 11 noon resolution: a new ECMWF or NCEP deterministic run showing Shanghai maximum forecast at 32°C or 30°C, early morning observations suggesting a slower or faster warm-up than modeled, or any official Shanghai Meteorological Bureau forecast update issued before noon local time.

Will the highest temperature in Shanghai on June 11 reach 31°C?

The 78% price reflects strong short-range forecast convergence on 31°C. The structural risk is the one-degree precision band: any adjacent outcome collapses this contract.

What does the NO contract represent?

NO pays out if Shanghai’s June 11 high lands at any temperature other than 31°C, including 30°C, 32°C, 33°C, 34°C, or 35°C and above. The NO side benefits from any forecast error in either direction.

What data or event would move this price most?

A weather model update or official Shanghai Meteorological Bureau forecast revising the June 11 high to 32°C or above would be the clearest bearish catalyst. An early morning observation showing rapid warming would reinforce YES.

When does this contract resolve?

The market resolves at 12:00 on June 11, 2026. Given the timestamp, resolution is imminent. New information has a very short window to reprice this contract.

How reliable is the volume and liquidity signal here?

Total volume of $75,414 is thin. Liquidity of $152,862 provides some depth, but a single large bet or a new model run can move this price sharply. Treat the 78% probability as a live forecast, not a settled consensus.