Highest temperature in London on August 5?

Platform comparison

Market context

London’s outcome will be set by the highest reading at London City Airport Station on 5 August, and the market will resolve by exact Celsius band rather than a broad daily feel. Current pricing is clustered around the mid-20s, with 25°C and 26°C jointly leading and 24°C not far behind, which fits a late-summer day where modest shifts in cloud, sea breeze, or frontal timing can move the daily maximum by a degree or two.[1]

The current zero per cent YES implies the crowd is not pricing a tail outcome, but the historical frame still matters: London’s August average maximum is around 22°C, while the market is sitting a little above that baseline rather than in heatwave territory.[1][9] That makes this a “normal warm day” setup rather than a record-chasing one, and recent UK summer commentary from the Met Office notes that daily maxima have been running above average without necessarily reaching seasonal extremes.[12] For comparison, wider UK reporting has highlighted 2026 heat spikes elsewhere in the country, including a 26.6°C reading at Kew Gardens and multiple days above 34°C nationally, but those are not direct proxies for the airport station used here.[6][13]

For accessibility, a no-KYC venue that allows up to $1,500 without identity checks means this market can be reached by smaller tickets with relatively low onboarding friction, although higher-volume participation would typically trigger verification limits. For regulation, German GlüStV rules can materially affect whether residents may access or advertise online betting-style products, while the US CFTC’s jurisdiction is relevant because weather-linked event contracts can sit close to derivatives oversight in the American market context; the practical result is that availability, limits, and onboarding can differ sharply by user location and platform policy. On the weather side, traders should watch the day’s official forecast revisions, the timing of any weak front or cloud cover, and the published London City Airport observations that will feed the final Wunderground reading; short-range updates from major forecasters have already pointed to a roughly 25°C day, with nearby forecasts spanning the mid-20s.[1][3][18]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in London on August 5? 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

Is Polymarket legal in my country?

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Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.

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Pseudonymously, yes — up to the KYC threshold. Is Kalshi Legal in California stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.

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You're responsible for documenting your trades. Is Kalshi Legal in California exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.

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