Highest temperature in Guangzhou on July 4?

Platform comparison

Market context

Guangzhou will experience its peak summer heat on 4 July 2026, with the highest temperature recorded at Baiyun International Airport determining the market outcome. The current crowd-implied probability of 0% for a "YES" result appears to stem from a misalignment in the market’s binary framing, as historical data and recent forecasts consistently place July highs well above typical thresholds. Polymarket data shows the leading outcome is "30°C" at 39%, followed by "31°C" at 33%, indicating strong market confidence in a hot day [1].

Historically, July is Guangzhou’s hottest month, with average highs around 33°C (91°F) and daily peaks rarely falling below 85°F or exceeding 96°F [4][7]. The Met Office forecasts a maximum daytime temperature of 34°C with an 80% chance of rain, suggesting monsoon activity may temper extremes but not eliminate high temperatures [2]. Lines.com notes that while climatology supports a hotter outcome, monsoon positioning currently keeps the bet for 31°C priced at 28.5% [3]. These comparable cases confirm that a 0% probability is inconsistent with observed weather patterns.

Traders should monitor real-time updates from Wunderground, the official resolution source, for the day’s peak temperature at Baiyun Airport [1]. Recent reports from Xinhua News Agency highlight that Guangzhou has experienced its longest summer since 1961, with record numbers of summer days and average temperatures of 23.3°C on Wednesday, reinforcing the trend of prolonged heat [8]. Additionally, Reddit users describe "insane heat" with temperatures over 30°C, confirming that extreme conditions are already present [9]. Any sudden shifts in monsoon intensity or official temperature logs could move the market line significantly.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for Highest temperature in Guangzhou on July 4?. 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).

Resolution & payout

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FAQ

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What's the difference between match odds and outright odds?

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