Shenzhen July 21 High Temperature: Will It Hit Thirty-One?

Shenzhen’s temperature market for July 21 has reached a conclusion before the thermometers stop climbing. The 31°C outcome contract sits at 98.2% implied probability, a number that reflects observed intraday conditions rather than forecasting. The data doesn’t care about the politics, and right now the data is speaking clearly: traders who watched Shenzhen’s afternoon high build through the morning hours moved this contract from the twenties to near-certainty in under 24 hours.

The market question asks whether the highest temperature in Shenzhen on July 21 will reach 31°C. The YES contract trades at $0.98, the NO contract at $0.02, and the resolution window closes at 2026-07-21 12:00:00. Total volume has reached $108,031, with $100,272 of that arriving in the last 24 hours alone.

How the Thirty-One Degree Contract Works

This contract resolves YES if Shenzhen’s official daily high temperature on July 21 reaches exactly 31°C as the designated outcome. The market operates across a ladder of outcomes spanning 25°C or below through 35°C or higher. Polymarket resolves based on official measurement data.

• YES at $0.98 implies a 98.2% probability that the 31°C outcome resolves correctly.
• NO at $0.02 implies a 1.8% probability that the outcome misses or a different temperature band captures the day’s high.

A NO payout requires the actual daily high to land in a different temperature band entirely. Shenzhen’s meteorological conditions on July 21 would need to diverge significantly from what intraday readings have already suggested. A reading of 30°C or below, or 32°C or above, would pull resolution to a competing outcome and leave this contract worthless.

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Momentum and Market Signals: One Hundred Thousand Dollars in Twenty-Four Hours

Here’s what the measurements are telling us. The momentum composite for this contract is unambiguous: flat movement over the last hour (+0.0%) layered on top of a 58.5% price surge over 24 hours, with a trend score of 64.08. That pattern is characteristic of a market that received confirming observational data during the day and repriced rapidly as the measured temperature approached the threshold. This is not speculative positioning. This is traders responding to real-time thermometer readings.

Total volume of $108,031 with $100,272 arriving in the last 24 hours signals genuine conviction, not thin positioning. Liquidity stands at $137,902, which means this contract has enough order book depth to sustain its current price without artificial support. Volume above $100,000 concentrated in a single day on a same-day temperature contract is a strong signal that market participants have high-confidence access to current observational data.

• The 24-hour price change of +58.5% connects directly to intraday temperature readings approaching or reaching the 31°C threshold in Shenzhen on July 21.
• The 1-hour change of +0.0% signals stabilization: the market has priced in the available information and is waiting for official resolution.
• The trend score of 64.08 confirms sustained directional momentum, not a spike-and-fade pattern.
• Liquidity of $137,902 exceeds total volume, indicating the order book is well-supported relative to market size.

Lines Analysis: Shenzhen’s Summer Baseline and the Thirty-One Degree Market

Shenzhen sits in a subtropical coastal zone where July daily highs routinely range between 30°C and 35°C. A 31°C reading on July 21 is not an extreme outcome for this city at this time of year. The market is pricing uncertainty, not science, and at 98.2% the uncertainty has essentially been resolved by observational data. The rapid intraday repricing from the high twenties to near-certainty is consistent with traders watching actual temperature stations confirm the threshold.

The genuine risk to this contract sits in measurement precision and outcome band structure. The competing outcome at 32°C captures any day where the high overshoots the 31°C band. If Shenzhen’s official high landed at 31.5°C and rounds into the 32°C outcome, this contract misses. That overshoot scenario is the primary mechanism through which NO becomes real, not a cooler-than-expected day.

• Official Shenzhen meteorological station data will determine resolution. Any rounding or instrument disagreement between stations could shift which band captures the daily high.
• The 32°C outcome contract would gain value if afternoon readings push above 31°C decisively.
• Cloud cover or sea breeze arriving in the afternoon could cap the high, but the intraday trajectory already priced into this contract suggests that window has narrowed.
• Resolution timing at 12:00:00 UTC may precede the city’s actual afternoon peak in local time. Confirmation of what the resolution timestamp measures relative to local solar time is the key remaining ambiguity.

Total volume of $108,031 favors the YES side overwhelmingly. The data trajectory supports 31°C as the resolved outcome. The overshoot scenario into 32°C is the only credible threat to this contract, and the current price reflects that traders assess that risk at roughly 2%.

LINES VERDICT

Near-Certain: Observational Data Has Spoken

The market has already done the science here. A same-day temperature contract repricing from the twenties to 98.2% in under 24 hours reflects measured conditions, not speculation.

What the market says: At 98.2% implied probability, the market treats 31°C as the resolved outcome. The only meaningful volatility between now and the 2026-07-21 12:00:00 resolution is the narrow risk that the official high overshoots into the 32°C band.

Key unknown: Whether the resolution timestamp captures Shenzhen’s full afternoon peak, and whether the official station data rounds the high into the 31°C band or the adjacent 32°C outcome, is the single remaining question that could reprice this contract before close.