Shanghai June 12 Low Temp: Will 22°C Hold?

Shanghai’s overnight low temperature on June 12 has become one of the sharpest short-term weather markets on Polymarket right now. The 22°C outcome sits at 57% implied probability, with momentum swinging hard in its favor over the past 24 hours. Here’s what the measurements are telling us: June overnight lows in Shanghai cluster tightly in the low-to-mid twenties, and the forecast window is narrow enough that uncertainty is collapsing fast.

This market asks a simple question: will Shanghai’s lowest recorded temperature on June 12, 2026 land exactly at 22°C? The 22°C outcome is priced at $0.57 (57% probability) against a combined field of alternatives ranging from 16°C or below up to 26°C or higher. The market closes at noon on June 12, 2026. Total volume sits at $5,376, with $4,837 of that trading in the last 24 hours alone.

How the Shanghai Temperature Contract Works

Resolution depends on the official lowest temperature recorded in Shanghai on June 12. The market resolves YES for the 22°C outcome if the minimum temperature for that date falls within the 22°C bracket. Alternative outcomes (21°C, 23°C, 20°C, 19°C, 18°C, 17°C, 16°C or below, 24°C, 25°C, 26°C or higher) each carry their own contracts and prices.

• 22°C outcome: $0.57 per share, implying 57% probability of resolution.
• All other outcomes: combined implied probability of 43%, spread across ten alternative brackets.

A miss on 22°C means the minimum temperature lands in any adjacent or distant bracket. Shanghai’s June climate sits in a transitional zone between late spring and early summer. Overnight lows of 21°C or 23°C are both plausible. The 22°C bracket wins only if the thermometer bottoms out precisely within that one-degree band.

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Momentum and Market Signals

The momentum composite here is unusually strong for a short-duration weather market. The 22°C outcome gained 16.5% in the last hour and 19.5% over 24 hours, with a trend score of 79.44. That kind of acceleration in the final 24 to 48 hours before resolution typically reflects traders updating on near-term forecast data, likely from numerical weather prediction models showing overnight lows converging on the 22°C range.

Total volume of $5,376 is thin by any standard. The $4,837 traded in the last 24 hours represents nearly the entire market’s lifetime activity, which means the price signal is very recent and driven by a small number of participants. Liquidity sits at $36,068, which is generous relative to volume. That gap means price can move sharply on even modest new bets. The data doesn’t care about the politics, but it does care about who is trading and why, and right now the trading is concentrated and directional.

• The 22°C outcome has surged from $0.21 at market open to $0.57 today, a move entirely driven by forecast convergence in the final resolution window.
• 24-hour volume of $4,837 out of $5,376 total means this market woke up in the last day, consistent with traders acting on updated weather model output.
• Liquidity of $36,068 is deep enough to absorb additional positioning without extreme slippage.
• The trend score of 79.44 places this market in the upper range of directional conviction for a short-duration contract.
• No whale trades have been identified, so the signal comes from distributed retail positioning rather than a single large actor.

Lines Analysis: Shanghai Temperature on June Twelve

The case for 22°C landing as the minimum is straightforward. Shanghai in mid-June typically sees overnight lows in the 21°C to 24°C range. The rapid price acceleration from $0.21 to $0.57 in the final trading window points to forecast models narrowing the overnight low toward 22°C. When a weather market moves this fast this late, it almost always reflects updated numerical model guidance, not speculation.

The risk to the 22°C outcome is adjacent bracket resolution. A minimum of 21°C or 23°C would both constitute misses. June overnight temperatures in Shanghai carry enough variability that a one-degree shift from forecast to observation is entirely normal. If a rain event or a brief cold air intrusion pushes the low below 22°C, or if warmer-than-expected southerly flow keeps the minimum at 23°C or 24°C, the contract resolves zero for 22°C holders.

• Shanghai Meteorological Service data in the 24 hours before resolution will be the final pricing input. Any model shift toward 21°C or 23°C would drain the 22°C price fast.
• Rainfall probability matters. A frontal passage overnight on June 11 to 12 could suppress the minimum below 22°C.
• The absence of large directional bets means no single trader has committed significant capital to defending or attacking the 22°C price.
• Related markets show no unusual weather-linked signal. The 22°C move appears specific to Shanghai June 12 forecast data.

Total volume of $5,376 keeps this in the low-confidence category by dollar weight. The market is pricing uncertainty, not science, but the directional move in the last 24 hours is as clean a forecast-convergence signal as you will see in a short-duration weather contract. The data currently favors 22°C landing as the minimum.

LINES VERDICT

FORECAST CONVERGENCE FAVORS TWENTY-TWO DEGREES

The 22°C outcome has absorbed nearly all the market’s trading activity in the final window before resolution, a pattern consistent with numerical weather model guidance pointing directly at that bracket for Shanghai’s June 12 overnight minimum.

What the market says: At 57% implied probability, the market treats 22°C as the single most likely outcome but leaves substantial room for adjacent brackets. With resolution less than 24 hours away and thin total volume, any last-minute forecast shift could reprice this contract sharply.

Key unknown: The final overnight low temperature as officially recorded in Shanghai on June 12 is the only thing that matters now. Any model update in the next 12 hours showing the minimum drifting to 21°C or 23°C would immediately challenge the 22°C price.

Scientific Context: Shanghai June Climate

Shanghai sits in a humid subtropical climate zone. June marks the onset of the plum rain season, a period of persistent low pressure, elevated humidity, and overnight temperatures that typically range from 21°C to 25°C. The narrow one-degree brackets in this market reflect how precisely forecast models can now resolve overnight minimums at 24 to 48 hour lead times. When traders cluster capital on a single bracket this late in the resolution window, they are effectively betting that the model output is correct to within one degree Celsius.

Before June 12 closes, the single most important data input is the 06:00 UTC or 12:00 UTC Shanghai surface observation. If that reading aligns with the 22°C forecast, the contract resolves cleanly. If it misses by even one degree, capital flows immediately to the adjacent bracket.

What is the 57% probability telling me?

It means the market assigns a 57% chance that Shanghai’s official overnight low on June 12 falls within the 22°C bracket. The remaining 43% is spread across ten other temperature outcomes.

What pays out if 22°C does not resolve?

Each alternative bracket (21°C, 23°C, 20°C, and so on) is a separate contract. Holders of the correct bracket receive the payout. The 22°C contract settles at zero if the minimum lands anywhere else.

What would move the 22°C price in the next 12 hours?

Any numerical weather model update showing the overnight minimum shifting to 21°C or 23°C would drain the 22°C contract and reprice adjacent brackets upward almost immediately.

When does this market resolve?

The market closes at noon on June 12, 2026. Resolution depends on the officially recorded lowest temperature in Shanghai for that date.

Is $5,376 in total volume enough to trust the price?

It is thin. With under $6,000 in total volume and no identified large trades, the 57% price reflects a small number of recent participants acting on forecast data. A single moderately sized bet could move this price meaningfully before resolution.