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Shanghai July 7 Low Temp: Will 27°C Hit?

Shanghai July 7 Low Temp: Will 27°C Hit?

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SR Sofia Renard Climate & Science Analyst
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Lines Verdict
NO at 53% implied probability

MARGINAL NO EDGE: The 27°C bracket is the most likely single outcome but competing brackets collectively outweigh it. Market probability: 48.5%.

47% Market Probability
1h +0.0% 24h +2.0% Trend Weak (43/100)
Volume
$20.3K
$19.5K in 24h
Liquidity
$22.5K
Moderate depth
Time Left
1 day
Resolves Jul 7
20K Vol. Jul 7, 2026

Shanghai sits in the thick of its summer heat season right now. The market is pricing the city’s lowest temperature on July 7 at 27°C with a 48.5% implied probability. That’s nearly a coin flip, which tells you something important: short-range urban temperature forecasts carry real uncertainty even two days out.

The market question asks whether the lowest recorded temperature in Shanghai on July 7 will resolve at exactly 27°C. YES trades at 0.49 and NO trades at 0.52 as of July 5, 2026. Total volume sits at $1,639 with a 24-hour volume matching that same figure, meaning this market opened and filled today. Liquidity at $27,860 is the meaningful number here, providing a cushion well above the volume traded.

How the Shanghai July 7 Low Temperature Contract Works

This contract resolves YES if official measurements confirm 27°C as Shanghai’s minimum temperature on July 7, 2026. Resolution date is July 7, 2026, at 12:00 UTC. The competing outcomes include a range from 21°C or below all the way to 31°C or higher, with 26°C, 25°C, 28°C, and 24°C all trading as separate contracts.

  • YES at 0.49 reflects a 48.5% probability that the overnight low lands precisely at 27°C on July 7.
  • NO at 0.52 reflects a 51.5% probability that the low falls at any other listed temperature bracket.

A NO payout requires the low to miss 27°C entirely, landing instead at 26°C, 28°C, or any other bracket. Shanghai’s July overnight lows typically cluster between 25°C and 29°C during humid summer conditions. That clustering is exactly why 27°C draws the highest single-outcome probability while still trading below 50%.

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Momentum and Market Signals

The momentum composite here is thin but directional. The trend score sits at 35.66, and the 1-hour price change shows no movement. The 24-hour change is unavailable because this market launched today, July 5. The price moved up 13.5% at open, which reflects initial market participants anchoring to the 27°C outcome as the most climatologically probable single bracket.

Volume at $1,639 is well below $1 million. That matters. Thin liquidity means one informed trader with a fresh weather model reading could move this price sharply before resolution on Tuesday. The $27,860 in liquidity provides price stability for now, but don’t mistake stability for conviction. The market is pricing uncertainty, not science.

  • The 27°C outcome opened at 0.26 and has risen to 0.49, a significant upward move reflecting growing trader consensus around the central bracket.
  • The 1-hour price change of +0.0% signals the market has paused at current levels, waiting on updated forecast data.
  • Volume below $1 million means any fresh meteorological data release or updated NWP model run could shift prices quickly before July 7.
  • Liquidity at $27,860 is healthy relative to volume, meaning the order book can absorb moderate trades without large slippage.
  • Trader sentiment sits at 48.5% YES versus 51.5% NO, a nearly balanced split that reflects genuine forecast uncertainty.

Lines Analysis: Shanghai Temperature on July 7

Here’s what the measurements are telling us. Shanghai’s July climatology puts average overnight minimums in the 26°C to 28°C range during active summer monsoon conditions. The 27°C bracket sits at the center of that distribution, which explains why it commands the highest single-outcome probability even at sub-50%. When a temperature outcome lands at the climatological mean, it captures the most probability mass while competing outcomes split the tails.

What makes NO real is the spread of competing outcomes. The 26°C and 28°C brackets each carry meaningful probability on their own. A cold air intrusion from the north, even a shallow one, could push the overnight low to 25°C or 26°C. Alternatively, a strengthening urban heat island effect or increased humidity from approaching convection could hold the low at 28°C or 29°C. Any of those scenarios pays NO.

  • Shanghai Meteorological Service forecast updates through July 6 will be the primary price mover before resolution.
  • NWP model agreement between ECMWF and GFS on the July 6-7 overnight low would push YES probability higher if both models converge on 27°C.
  • Any forecast showing a cold front passage or significant wind shift before July 7 would pressure YES and lift the 25°C or 26°C brackets.
  • Persistent high humidity and light winds favor the 27°C to 28°C range, supporting YES.
  • Model divergence above plus or minus 1°C on the overnight low forecast would keep the market near even odds through resolution.

Total volume of $1,639 reflects an early-stage market. The data favors the 27°C bracket as the single most probable outcome, but the collective weight of competing brackets means NO holds a slim edge. The difference between a 27°C low and a 28°C low can come down to cloud cover timing or a brief sea breeze interaction. That’s the irreducible uncertainty this market is priced around.

LINES VERDICT

Marginal NO Edge in a Genuine Coin Flip

The 27°C bracket is the most likely single outcome, but competing brackets collectively outweigh it. The data doesn’t care about the politics, and right now the data says the low is most probable near 27°C but not locked there.

What the market says: At 48.5% implied probability, traders see 27°C as the best single guess but give NO a slight edge because the low could plausibly land at 26°C or 28°C instead. With resolution on July 7, 2026, any updated model forecast in the next 48 hours could shift this price sharply given thin volume.

Key unknown: The Shanghai Meteorological Service forecast update for the July 6 overnight period is the single most important data point. A consistent model consensus targeting 27°C would push YES above 0.55. A shift toward 26°C or 28°C would hand NO a clear edge.

Frequently Asked Questions

It means traders give roughly a 48.5% chance the lowest temperature in Shanghai on July 7 lands exactly at 27°C. All other temperature brackets collectively account for the remaining 51.5%.

NO pays out if the official minimum temperature on July 7 in Shanghai is anything other than 27°C, including 26°C, 28°C, or any other listed bracket.

Updated NWP model forecasts from ECMWF or GFS, and official Shanghai Meteorological Service forecasts for the July 6 to 7 overnight period, are the primary price drivers before resolution.

The market resolves on July 7, 2026, at 12:00 UTC, based on official recorded minimum temperature data for Shanghai on that date.

Total volume of $1,639 is very thin. Liquidity at $27,860 provides order book stability, but low volume means a single informed trade could move the YES price significantly before resolution.

We aggregate the live positions of the top 50 Polymarket whales (ranked by 30-day tracked volume) into one composite reading per market. It refreshes every hour. The percentage shows how many of those whales hold YES versus NO; the net dollar position shows the cohort's directional exposure in dollars.

A convergence event fires when three or more tracked wallets buy the same outcome on the same market within a four-hour window. We surface these in the activity feed and the VIP digest.

No. Lines is an editorial and data product. We do not operate prediction markets, custody funds, or accept trades. All trade flows deep-link to Polymarket via our affiliate code. Probabilities shown are market-implied and not predictions or recommendations.

What Could Shift These Probabilities?

Models Converge on Twenty-Seven

If ECMWF and GFS both target the July 6 to 7 overnight low at 27°C with tight spread, traders would increase confidence in the central bracket. YES could push above 0.60. Persistent humidity and light winds over Shanghai in the 48 hours before resolution would reinforce that convergence and reduce the probability of adjacent outcomes.

Forecast Shifts to Twenty-Eight or Higher

Strengthening urban heat retention or increased low-level moisture from approaching convection could push the overnight low to 28°C or 29°C. That scenario would drain probability from YES and redistribute it to higher brackets. The 28°C and 29°C contracts would gain ground, and YES at 27°C could fall back toward the 0.30 range.

Cold Shallow Intrusion Lifts Twenty-Six

A shallow northerly surge or unexpected cloud clearing before dawn on July 7 could drop the overnight low to 26°C. That outcome would pay NO while lifting the 26°C bracket's market price. Shanghai July temperatures are not immune to brief sub-27°C overnight dips during active monsoon transitions, especially if a weak trough passes north of the city.

Thunderstorm Outflow Breaks the Pattern

A convective cell producing a strong cold pool and outflow boundary near Shanghai overnight on July 6 to 7 could temporarily drop the low well below model guidance. Observation-based minimum temperatures during thunderstorm outflow events can deviate by 2°C to 3°C from NWP forecasts. That scenario could collapse YES and redistribute probability across multiple lower brackets simultaneously.

Key macro factor: Shanghai's July 2026 conditions reflect the background warming trend that has elevated urban overnight minima across East Asian coastal cities, making sub-25°C overnight lows increasingly rare and strengthening the probability mass around the 26°C to 28°C cluster.

Market Timeline

Jul 5, 4:30 AM
Market Created
Jul 5, 4:30 AM
Market Opened
Tuesday, Jul 7
Market Resolution

Market Comments

Probabilities shown are market-implied and not predictions or recommendations. This content is for informational purposes only.