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Chengdu July 5 Peak Heat: Will 35°C Hit?

Chengdu July 5 Peak Heat: Will 35°C Hit?

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SR Sofia Renard Climate & Science Analyst
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Lines Verdict
YES at 100% implied probability

UNCERTAIN: EXACT-BIN TEMPERATURE CALL. Eleven competing outcome bins structurally limit any single temperature from commanding majority probability. The 35°C outcome at 29.5% reflects genuine model spread, not a directional edge. Market probability: 29.5%.

100% Market Probability
1h +0.0% 24h +67.1% Trend Weak (46/100)
Volume
$90.5K
$81.3K in 24h
Liquidity
$163.9K
Deep liquidity
Time Left
4 hours
Resolves Jul 5
91K Vol. Jul 5, 2026

Chengdu sits in a basin. That geography matters on a market like this. The Sichuan Basin traps heat, and July is peak summer. The market is currently pricing a roughly 30% chance that July 5 tops out at exactly 35°C. That is a meaningful number, but it is not a consensus call. The data doesn’t care about the politics of whether this feels like a hot day.

This market asks: what is the highest temperature in Chengdu on July 5, 2026? The 35°C outcome carries a YES price of 0.30 and a NO price of 0.71, implying a 29.5% probability. The market resolves at noon local time on July 5, 2026. Total trading volume stands at $2,938.

How the 35°C Contract Works

A YES resolution requires official measurements to record a daily maximum of exactly 35°C in Chengdu on July 5. The contract resolves based on official weather data per the market’s stated resolution source. A NO outcome covers every other peak temperature, from 29°C or below all the way up to 39°C or higher.

  • YES (35°C peaks): priced at 0.30, implying roughly 30% probability.
  • NO (any other peak): priced at 0.71, implying roughly 70% probability.

The NO side covers a wide spread of outcomes. Temperatures landing at 34°C, 36°C, 37°C, 38°C, or higher all count as NO for this specific contract. That structural breadth is the main reason NO trades at such high confidence. The market is not betting that Chengdu stays cool. It is betting that the single 35°C bin is unlikely to be the exact peak.

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Momentum and Market Signals

The momentum composite here is weak and bearish. The 1-hour price change registers at negative 2%, and the trend score sits at 41.95, well below the midpoint of a neutral 50. The most likely driver is updated short-range weather model output, which would reprice the bin probabilities as forecasters narrow their confidence intervals for July 5.

Total volume on this market is $2,938, and 24-hour volume matches that figure exactly, meaning essentially all activity happened in the last day. Liquidity stands at $34,731. Because volume is well below $1 million, this market is thin. A single large trade or a sharp weather forecast revision can move the price significantly.

Key Factors

  • The 1-hour price decline of 2% signals traders are fading the 35°C bin, possibly as updated models shift peak temperature forecasts toward 34°C or 36°C.
  • Trend score of 41.95 confirms mild negative momentum. The contract opened this market cycle at lower prices and pushed higher intraday before pulling back.
  • Total volume under $3,000 means price discovery is shallow. A single informed trader with current model data holds outsized influence here.
  • Chengdu’s Sichuan Basin location creates above-average heat retention in summer, historically pushing July highs into the 33 to 38°C range.
  • The 11 competing outcome bins dilute probability across a wide temperature range. No single bin commands majority confidence.

Lines Analysis: Chengdu July 5 Temperature

Here’s what the measurements are telling us. Chengdu in early July regularly sees daytime highs in the 33 to 37°C range. The July climatological mean maximum sits around 33 to 34°C, but heat events push readings several degrees above that. The 35°C bin is plausible, not dominant. Short-range numerical weather prediction models typically converge on a forecast range of plus or minus one to two degrees within 48 hours. Right now, that uncertainty is spread across multiple bins, which is precisely why no single outcome commands more than 30%.

What makes NO real is simple arithmetic. Eleven bins split the probability. Even if forecasters are highly confident Chengdu peaks somewhere in the 34 to 36°C range, that confidence is distributed across at least three outcome slots. A forecast pointing to a 35°C high still carries enough model spread to land at 34°C or 36°C. That spread is the structural barrier for any YES outcome on an exact-bin temperature market.

Signals to Monitor

  • European Centre for Medium-Range Weather Forecasts model output for July 5: a tightening ensemble around 35°C would push YES prices higher.
  • China Meteorological Administration official forecast for Chengdu: any explicit mention of 35°C as the expected high would be the clearest single signal.
  • Heat advisory or high-temperature warning issuance for Sichuan Province: would confirm upper-range temperature expectations.
  • Neighboring Chongqing temperature readings on July 4: Chongqing and Chengdu often track within one to two degrees in summer, providing a real-time proxy.
  • Any significant deviation in ECMWF or GFS ensemble spread narrowing toward a specific bin before market close on July 5.

The market is pricing uncertainty, not science. Total volume of $2,938 reflects a thin, short-horizon contract where local weather forecasting noise dominates. The data leans toward the 34 to 36°C range for Chengdu in early July, but no single bin within that range should trade above 30 to 35% without tighter model consensus. The current 29.5% for the 35°C outcome is a fair reflection of that uncertainty, not a confident directional bet.

LINES VERDICT

UNCERTAIN: EXACT-BIN TEMPERATURE CALL

The 35°C outcome is structurally limited by the number of competing bins. Even a well-forecast hot day spreads probability across 34°C, 35°C, and 36°C simultaneously.

What the market says: The 29.5% implied probability reflects genuine forecasting uncertainty across multiple temperature bins within a plausible range. With the resolution window arriving in under 48 hours, expect sharp price swings as model output updates.

Key unknown: The next China Meteorological Administration 24-hour forecast for Chengdu on July 5 is the single most important data point. A narrow, explicit call of 35°C as the expected high would reprice this contract immediately.

Scientific Context

Chengdu sits at roughly 500 meters elevation inside the Sichuan Basin. Basin geography reduces wind ventilation and amplifies afternoon heat. Historical July temperature records for the city show maximum readings ranging from 31°C to above 39°C during heat events, with the most common peak band in recent decades clustering between 33°C and 37°C. This context makes 35°C an entirely plausible outcome. It also makes it one of four or five plausible outcomes with similar baseline probability, which is the central challenge for any single-bin contract.

China has experienced intensifying summer heat across its interior provinces over the past decade. This structural warming trend increases the probability weight on the upper bins, 36°C to 39°C and above, relative to historical base rates. That shift in the distribution does not favor the 35°C bin specifically. It dilutes it by pulling probability mass toward higher readings. Before the July 5 resolution, any official heat advisory for Sichuan Province or model ensemble output converging tightly on 35°C would be the clearest catalyst for upward repricing.

Frequently Asked Questions

It means traders collectively estimate a roughly 30% chance Chengdu's peak temperature on July 5 lands exactly at 35°C. Eleven competing bins split the remaining probability.

NO pays out if Chengdu's July 5 high is anything other than exactly 35°C, including 34°C, 36°C, 37°C, or any other listed outcome.

An updated China Meteorological Administration forecast explicitly calling for 35°C on July 5 would push YES higher. A forecast pointing to 34°C or 36°C would push it lower.

The market resolves on July 5, 2026 at 12:00 noon. Resolution is based on official temperature data for Chengdu on that date.

Volume this low means price can shift sharply on a single trade. Treat the current 29.5% probability as a rough estimate, not a precise forecast.

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?

Model Convergence on 35°C

If the China Meteorological Administration or ECMWF ensemble output converges tightly on 35°C as the July 5 peak for Chengdu, the YES price could climb quickly above 0.40. Thin liquidity amplifies any price move. A narrow forecast cone with 35°C at the center is the clearest path to higher YES prices before resolution.

Models Shift to 34°C or 36°C

If updated 48-hour forecasts place the expected high at 34°C or 36°C with narrowing spread, probability flows away from the 35°C bin sharply. With volume this thin, even a moderate shift in trader interpretation of the latest model run could push YES below 0.20 before July 5.

Heat Advisory Issued for Sichuan

An official heat advisory from Chinese meteorological authorities naming Chengdu and citing 35°C thresholds would directly validate the YES bin. Advisories in China are typically issued when temperatures are forecast to meet or exceed defined thresholds, and a 35°C advisory would be a strong signal for this exact outcome.

Sudden Convective System Changes Forecast

A late-developing thunderstorm or convective weather system over Sichuan on July 4 or early July 5 could cap afternoon temperatures below 33°C, collapsing probability across the 34 to 36°C cluster simultaneously. Convective events are difficult to model at range and represent the main non-linear risk to all mid-range temperature bets.

Key macro factor: China's interior basin regions have experienced increasing frequency of heat events above 35°C in recent summers, shifting the baseline distribution toward upper temperature bins relative to pre-2020 climatology.

Market Timeline

Jul 3, 4:03 AM
Market Created
Jul 3, 4:03 AM
Market Opened
12:00 PM
Market Resolution

Market Comments

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