Shanghai July 21 High: Will 33°C Hit?

Shanghai’s weather on July 21 is a one-day question with a narrow answer window. The market has priced a 33°C daily maximum at 41.5% implied probability, meaning traders see it as a real contender but not the favorite. Here’s what the measurements are telling us: the city sits deep inside its summer heat season, and the difference between a 33°C and a 34°C peak can come down to a single afternoon cloud band or a sea breeze that arrives two hours late.

The market question asks for the single highest temperature recorded in Shanghai on July 21, 2026, with resolution at 12:00 UTC on that date. The 33°C outcome trades at 0.42 YES and 0.59 NO. Total volume sits at $58,695, with $35,096 traded in the last 24 hours. Liquidity stands at $78,051, which is healthy for a single-day weather market.

How the 33°C Contract Works

This contract resolves YES if Shanghai’s officially recorded daily maximum temperature on July 21, 2026 lands exactly at 33°C. Resolution uses the market’s designated weather data source for Shanghai. Any other reading, whether 32°C, 34°C, or anything outside that single degree, pays out to NO holders of the 33°C contract.

• YES at 0.42 implies a 41.5% chance the official daily high lands exactly on 33°C.
• NO at 0.59 implies a 58.5% chance the high lands on any other value in the outcome set.

The NO side here is structurally wide. Shanghai’s daily maximum missing 33°C exactly means the temperature settles at 34°C, 32°C, 35°C, or any of the other listed outcomes. Each of those alternative buckets carries its own market. A single degree of forecast error, common in short-range urban meteorology, redirects the full payout.

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Momentum and Market Signals

The 33°C contract gained 8% over the past 24 hours, with no movement in the last hour. The trend score of 46.63 sits just below neutral. That 24-hour gain is the clearest signal: traders repositioned toward 33°C after July 20 readings and updated regional forecasts gave the mid-range temperature bucket more credibility.

Total market volume at $58,695 is thin. The 24-hour volume of $35,096 represents nearly 60% of all-time activity, which means most of the price discovery happened today. With liquidity at $78,051, the order book can absorb moderate trades without sharp price gaps, but a large single move on new forecast data would still reprice quickly. Volume below $1M means this market can move sharply on any credible meteorological update before resolution tomorrow.

• The 24-hour price gain of 8% connects directly to updated short-range forecast models that show Shanghai’s July 21 high clustering around 33 to 34°C.
• The 1-hour flat reading at 0.0% change suggests the market is waiting, not moving, ahead of overnight model runs.
• The trend score of 46.63 reflects mild bearish lean, meaning the market still favors a reading other than exactly 33°C.
• Related markets show strong positive correlation with the Hong Kong July 20 temperature market, consistent with a regional heat pattern across the Yangtze Delta and South China coast.
• Thin total volume means a small number of informed traders, or a single updated weather model post, could shift the price by 5 to 10 points before the 12:00 UTC close tomorrow.

Lines Analysis: Shanghai’s Temperature Bucket on July 21

Shanghai in late July typically sees daily highs between 32°C and 36°C, with the urban heat island effect pushing readings at official stations toward the upper end of regional forecasts. The 33°C bucket benefits from being the modal forecast value in most global medium-range models for this date. When synoptic conditions are stable, mid-summer Shanghai tends to land in exactly this range. The 8% price gain over 24 hours reflects traders reacting to forecast data that put 33°C squarely in the middle of the probability distribution.

The gap between 33°C and the adjacent buckets is what makes this market structurally fragile. A shift in the sea breeze timing from Hangzhou Bay, afternoon convective cloud development, or a minor synoptic pattern change can push the peak reading half a degree in either direction. That half-degree lands in a completely different resolution bucket. The 34°C contract and the 32°C contract each carry real probability, and the 33°C contract’s 41.5% implies traders have acknowledged exactly this spread-out distribution.

Signals to monitor before resolution:

• The European Centre for Medium-Range Weather Forecasts midnight model run for July 21 is the single highest-impact data point before market close.
• Shanghai Meteorological Bureau short-range forecast updates through the overnight hours will reflect any boundary layer or convective changes.
• Sea surface temperature anomalies in Hangzhou Bay affect the timing and strength of onshore afternoon flow, which can cap or extend the daytime high.
• Any regional heat advisory or high-temperature alert from China Meteorological Administration would signal a reading above 35°C, pushing probability mass toward the upper buckets.
• Observed morning temperatures at Shanghai Hongqiao and Pudong stations on July 21 will give traders a strong early signal of where the daily peak is tracking.

Total volume of $58,695 with 60% arriving in the last 24 hours tells you this market activated late, as traders got access to short-range forecast data. The data currently favors the 33 to 34°C range, but the single-degree resolution structure means adjacent buckets absorb nearly as much probability mass. The market is pricing uncertainty, not science, and that uncertainty is real at this forecast range.

LINES VERDICT

Narrow Window, Real Uncertainty

Shanghai’s July 21 forecast clusters around 33 to 34°C, giving the 33°C bucket genuine claim on the outcome, but the single-degree resolution structure keeps uncertainty high and competing buckets in play.

What the market says: At 41.5% implied probability, the market prices 33°C as the most likely single outcome but stops well short of conviction. Thin total volume and a fast-moving 24-hour price mean any update to overnight forecast models could shift the price significantly before the 12:00 UTC resolution tomorrow.

Key unknown: The European and NCEP model runs between midnight and 06:00 UTC on July 21 are the single most important data inputs. If those models converge on 34°C as the peak, expect probability to migrate out of the 33°C contract and into the adjacent bucket before the market closes.