Shanghai June 27 Low Temp: Will 22°C Hit?

Shanghai’s overnight temperature on June 27 has become one of the sharpest short-resolution weather markets on Polymarket right now. A 56% implied probability on a 22°C low temperature sounds modest, but the momentum behind that price is anything but. The market has moved more than 22 percentage points in 24 hours, which tells you traders have seen something in the forecast data. Here’s what the measurements are telling us.

The market question asks whether Shanghai’s lowest recorded temperature on June 27 will land at exactly 22°C. The YES price sits at $0.56 and NO at $0.44. This contract resolves at noon UTC on June 27, 2026. Total traded volume stands at $8,224, with $5,142 of that arriving in the last 24 hours alone.

How the Twenty-Two Degree Threshold Works

This is a discrete temperature market. YES pays out only if the official lowest temperature recorded in Shanghai on June 27 hits exactly 22°C. The resolution source is market resolution, meaning the price will settle against verified meteorological data for that date. Any deviation, 21°C, 23°C, or anything else on the outcome ladder, sends the contract to zero.

• YES ($0.56, 56% implied): Shanghai’s June 27 minimum temperature is recorded at exactly 22°C.
• NO ($0.44, 44% implied): The minimum lands at any other temperature on the outcome ladder: 21°C, 20°C, 23°C, 19°C, 24°C, 18°C, 16°C or below, 25°C, 26°C or higher, or 17°C.

The NO side covers a wide range of outcomes. Shanghai’s minimum temperature landing at 21°C or 23°C both resolve this contract against the 22°C position. That breadth makes the NO side structurally interesting even at 44%, because the market is essentially saying the forecast distribution is tight enough around 22°C to justify a 56% concentration on a single degree reading.

Momentum and Market Signals

Sponsored Partner

The momentum composite here is striking. A 9% one-hour move combined with a 22% 24-hour gain and a trend score of 67.37 points to a sharp repricing event, almost certainly driven by updated numerical weather prediction models refreshing the Shanghai forecast window for June 27. When short-horizon weather markets move this fast, it usually means a model run has converged on a tighter temperature range, and traders are front-running the final print.

Total volume at $8,224 is thin, and $5,142 of that arrived in the past 24 hours. Liquidity is $23,542, which is healthy relative to volume but confirms this is a small market. Thin volume means a single large position can move price sharply. The data doesn’t care about the politics, but in a market this size, it does care about order flow concentration.

• The 1-hour price change of +9.0% and 24-hour change of +22.0% signal a rapid convergence on 22°C as the most likely forecast outcome, likely driven by a fresh model run update.
• The trend score of 67.37 confirms directional conviction is building, not fading, into the final resolution window.
• Total volume of $8,224 is below $10,000, placing this in a LOW to MEDIUM confidence tier. A single position of a few thousand dollars could move price meaningfully.
• Liquidity at $23,542 exceeds 24-hour volume, suggesting the order book is not yet stressed, but the gap between volume and liquidity narrows fast near resolution.
• Trader sentiment sits at 56% YES versus 44% NO, a lean that aligns with the price but is not a strong consensus signal at this volume level.

Lines Analysis: Shanghai’s June Low and the Single-Degree Bet

What supports the 22°C outcome is the convergence signal in the price action itself. When a weather market reprices 22 points in 24 hours approaching a same-day resolution, it typically reflects professional weather traders updating on ensemble model output. Shanghai’s late June climatology puts overnight lows in the 21°C to 24°C range depending on humidity and cloud cover. The 22°C reading is climatologically plausible and sits near the statistical center of that range for late June.

The barrier for the current leader is precision. Shanghai’s official temperature station needs to record exactly 22°C as the daily minimum. A 21.5°C reading that rounds down, or a 22.4°C reading that rounds up, could change resolution depending on the rounding convention used. The ten available outcome bins mean the probability mass is distributed across a wide ladder, and any late-breaking atmospheric disturbance, a passing rain band or unexpected overnight cooling, shifts the distribution off the 22°C peak entirely.

• Watch for updated ensemble model output from ECMWF or GFS covering Shanghai for the June 27 overnight window. Any shift in forecast mean temperature by even one degree reprices this contract sharply.
• Monitor Shanghai Hongqiao or Pudong station reports for actual observed temperatures as the June 27 date opens in local time.
• Track whether any convective activity or frontal passage is forecast for the Yangtze Delta region overnight June 26 into June 27, which would push minimum temperatures lower.
• Follow any additional large trades in this contract given thin volume. A position above $500 would represent more than 6% of total volume and could move price.

Total volume of $8,224 is modest, and the market is pricing uncertainty, not science, on a hyperlocal meteorological outcome. The data favors the 22°C outcome right now, driven by model convergence. But with ten competing outcome bins and a single-degree resolution requirement, the YES side is carrying real precision risk all the way to the noon UTC close.

LINES VERDICT

LEAN YES, HIGH PRECISION RISK

The 22°C outcome has genuine momentum behind it, driven by forecast model convergence, but single-degree resolution in a ten-bin market means the margin for error is nearly zero.

What the market says: A 56% implied probability reflects a meaningful but not dominant lean toward 22°C as Shanghai’s June 27 low. Volatility is high with the contract resolving in less than 24 hours, and thin volume means the price can swing several points on a single updated forecast.

Key unknown: The single most important input is the final ensemble model run covering Shanghai’s overnight low for June 27. Any shift in the forecast distribution by one degree in either direction reprices this contract immediately.