Highest temperature in Paris on July 20?

Platform comparison

Market context

Paris is about to experience an intense heatwave on 20 July 2026, with forecasters warning temperatures at Paris-Le Bourget could soar between 36°C and 39°C, potentially reaching 40°C on some afternoons[3]. This event frames the current 0% crowd-implied probability for lower ranges, as historical data shows July is Paris’s hottest month where canicules routinely push highs to 35–40°C, far exceeding the average 25–27°C[2]. The market’s frontrunner is currently 24°C at 100%, suggesting a significant divergence between crowd sentiment and the active heatwave forecast[1].

Traders should monitor the arrival of cooler Atlantic air expected by the end of the week, which forecasters believe will drop temperatures below 30°C[3]. The settlement relies on Wunderground data for the Paris-Le Bourget Airport Station, making real-time updates critical as the heatwave duration extends over several days[3]. Regulatory accessibility remains a key factor: under German GlüStV, the market operates within specific tax frameworks, while US CFTC reach implies potential compliance scrutiny for US participants. The ‘no-KYC up to $1,500’ threshold ensures broad accessibility for this weather event, allowing traders to engage without immediate identity verification for smaller positions.

The probability of 0% for lower temperature ranges appears inconsistent with the active forecast of 36–40°C, highlighting a potential mispricing opportunity as the heatwave intensifies[3]. Historical precedents of Paris hitting 40°C, though rare, confirm the upper range is plausible, reinforcing the need to watch daily Wunderground updates as the settlement window closes on 20 July 2026[3].

Sources: 1 · 2 · 3

Methodology

This overview of Highest temperature in Paris on July 20? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.

Resolution & payout

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FAQ

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What if regulation changes?

If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.