Highest temperature in London on August 6?

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Market context

The relevant event is the highest temperature recorded at London City Airport on 6 August 2026, which will be settled from the day’s maximum reading rather than a forecast or hourly average. Early market pricing at 0% for YES implies traders are heavily leaning to a temperature band outside the event’s target range, or to the view that the day’s peak will be unexceptional.

That scepticism fits the seasonal baseline. AccuWeather’s London August outlook shows a 6 August high of about 75°F, or roughly 24°C, which sits close to the long-run summer norm rather than heatwave territory[1]. London’s August average daytime temperature is around 18°C, so a single reading in the low-to-mid 20s would be broadly normal, while anything materially higher would need a stronger warm spell than the current daily guidance suggests[8][13].

For traders, the key catalysts are the morning and midday forecast updates, any change in cloud cover or wind, and whether south-east England sits under a late-summer ridge of high pressure rather than a more Atlantic, unsettled pattern. Current reporting for 6 August points to sunny intervals and mild temperatures, with forecast highs around 22°C and a limited chance of rain[3]. The market can only be resolved once the full day’s observations are in, so late-afternoon warmth still matters if sunshine persists into the peak heating hours.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in London on August 6?. 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 or Manifold.

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