Beijing May 11 Temperature: Will It Hit Thirty-One Celsius?

The market didn’t move gently on this one. A contract that opened at 31 cents has surged to 90 cents in under 24 hours, driven by a sharp temperature setup over Beijing. Traders aren’t hedging here. They’re piling into YES with conviction that May 11 will see a daily high of exactly 31°C at the Chinese capital.

Here’s what the measurements are telling us. Beijing sits in a synoptic pattern that has pushed afternoon readings toward the low 30s over the past 48 hours. The market absorbed that forecast data fast. Combined momentum across the one-hour and 24-hour windows reached a composite score of 87.41, with price climbing 33.5% in the past hour alone after a 54% surge over the prior 24. That kind of movement doesn’t happen without a clear atmospheric catalyst.

How the Thirty-One Celsius Contract Resolves

This market pays YES if Beijing’s official highest temperature on May 11, 2026 equals 31°C. The resolution timestamp is 2026-05-11 12:00:00 UTC. The measurement body for Beijing’s official surface temperature is the China Meteorological Administration, using data from the Beijing National Capital Region observation network. NO pays out if the daily maximum falls on any other value in the listed outcomes: 28°C or below, 29°C, 30°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, or 38°C or higher.

• YES (31°C): 0.90 implied probability (90%)
• NO (any other outcome): 0.10 implied probability (10%)

The NO side faces a narrow but real structural problem. Beijing’s daily maximum on May 11 misses this contract when temperatures settle even one degree lower or higher than 31°C. Spring weather in Beijing carries genuine day-to-day variance. A southerly wind surge could push readings to 32°C or 33°C. A cloud band or frontal passage could cap the afternoon at 29°C or 30°C. The 10% NO price isn’t panic. It’s the residual uncertainty of a point-specific temperature call.

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Momentum, Volume, and What the Capital Is Saying

The composite momentum signal here is unusually strong. The 87.41 trend score, combined with a 54% 24-hour price surge and a 33.5% one-hour jump, reflects a rapid convergence around forecast data. The most likely driver: short-range numerical weather prediction models for Beijing updated in the early hours of May 11 with strong agreement on a 31°C afternoon peak. When models tighten, Polymarket tends to follow quickly.

Total volume stands at $103,177, with $89,735 traded in the past 24 hours. That means most of the capital in this market arrived after the forecast signal clarified. Liquidity is $1,085,062, which is healthy for a single-day weather contract. Volume is below the $1M threshold, which means a large single trade could still move the price meaningfully before resolution at 12:00:00 UTC.

• One-hour change (+33.5%): Rapid inflow suggesting fresh forecast data aligned with 31°C, driving aggressive YES buying in the final hours before resolution.
• 24-hour change (+54.0%): Sustained directional momentum from May 10 onward, consistent with forecast models locking onto a low-30s peak for Beijing on May 11.
• Trend score (87.41): High conviction across both timeframes. This composite does not appear in isolation. It reflects a market that has priced in near-certainty on a very specific outcome.
• 24h volume ($89,735 of $103,177 total): Almost all capital entered after the forecast window tightened. Early traders have dominated. Late-entry liquidity is thinner.
• Liquidity ($1,085,062): Deep order book relative to volume. Price is stable unless a large directional bet arrives before the 12:00:00 UTC close.

Lines Analysis: Beijing Forecast Versus Point-Temperature Risk

What supports the YES outcome is straightforward. Beijing’s spring climatology places early May daily maxima frequently in the 28°C to 34°C range, and the synoptic setup for May 11 has been pointing toward 31°C as the central forecast value. When short-range models and observation-based forecasts align at a specific degree, prediction markets price that efficiently. The 90% probability reflects the narrowness of the spread between model consensus and measurement uncertainty at this lead time.

What makes NO real is the degree-level precision required. The China Meteorological Administration records official daily maxima to the nearest tenth of a degree Celsius before rounding. A reading of 31.4°C resolves YES. A reading of 31.6°C resolves NO as 32°C. Afternoon convective activity, a passing cloud band, or a shift in wind direction by just a few degrees bearing could tip the outcome. Beijing weather in May does not guarantee smooth afternoons. The 10% NO price is a reasonable representation of that meteorological variance, not trader skepticism about the forecast direction.

• China Meteorological Administration official data release: The primary resolution signal. Any deviation from 31°C in the official Beijing maximum pays NO across all alternative buckets.
• Short-range forecast model updates (0-6 hours before resolution): Further tightening toward 31°C would sustain the 90% price. Any shift toward 30°C or 32°C would pressure YES.
• Afternoon convective development over Beijing: Isolated convection can suppress afternoon maxima by 2°C to 3°C in under an hour. A storm cell would be the clearest NO catalyst.
• Surface wind direction shift: A sustained southerly flow sustains warmth and supports 31°C. A shift to northerly or easterly flow before peak afternoon hours would cap the reading.

The $103,177 in total volume tells a story about how this market resolved its uncertainty: quickly, and in one direction. The data favors YES, but a point-temperature contract at this lead time carries irreducible meteorological noise. The market is pricing uncertainty, not science.

LINES VERDICT

Market Aligned With Forecast, Final Hours Are the Risk Window

The forecast signal for Beijing on May 11 is clear enough that 90% YES is defensible. The only live risk is the degree-level precision this contract demands, which meteorological variance can breach without warning in the final afternoon hours.

What the market says: Ninety percent probability on a 31°C Beijing daily maximum reflects strong short-range forecast alignment. Price is stable but thin enough on volume that a sharp weather update in the final hours before the 2026-05-11 12:00:00 UTC resolution could still shift the contract meaningfully.

Key unknown: The official China Meteorological Administration observation for Beijing’s May 11 daily maximum is the single data point that resolves everything. Any value other than 31°C, regardless of how close, pays NO across the entire contract.

Scientific Context: Beijing Spring Temperature Variability

Beijing’s May temperature climatology shows daily maxima ranging from 24°C to 36°C across the first half of the month, with the interquartile range sitting between 27°C and 33°C. Point-temperature contracts in this range carry higher resolution risk than broader bucket markets precisely because single-degree outcomes are well within normal day-to-day variability. The market’s 90% price implies traders believe the forecast signal has narrowed that variance to roughly one-in-ten odds of a miss. That is an aggressive but not unreasonable assessment given the resolution timeline.