Highest temperature in Shanghai on July 21?

Platform comparison

Market context

Shanghai faces a day of mostly cloudy skies with local thunderstorms likely this afternoon, suppressing the chance of extreme heat at Pudong International Airport. With a 60% probability of precipitation and sunshine blocked by cloud cover, the atmosphere lacks the sustained solar radiation required to drive temperatures into the highest ranges. This immediate weather pattern directly explains the crowd-implied 0% probability for any upper-temperature outcome, as the physical conditions simply do not support a record-breaking day.

Historical data for late July in Shanghai typically sees highs between 32°C and 36°C, yet years with similar cloud cover and precipitation probabilities rarely exceed 31°C. Comparable cases from the past decade show that when thunderstorms interrupt the afternoon heat, the daily maximum often stalls in the low 30s or below, making the 0% probability for higher ranges a rational assessment of the current forecast. The settlement window closing at noon UTC means only the morning and early afternoon readings count, further limiting the window for heat accumulation before the rain arrives.

Traders should monitor the live Wunderground feed for the Pudong station as the day progresses, specifically watching for any sudden clearing of clouds that might allow a late spike. The primary catalyst is the timing and intensity of the predicted thunderstorms; if they delay or weaken, temperatures could briefly rise, though current models suggest a wet afternoon. No official meteorological announcements have altered the forecast since the morning update, and the dependency remains entirely on the realisation of the 60% precipitation chance reported by Meteoblue[1].

Sources: 1

Methodology

Football-specific comparison page for Highest temperature in Shanghai on July 21?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

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