Highest temperature in London on August 2?

Platform comparison

Market context

The event is the **highest temperature measured at London City Airport Station** during the day, with settlement tied to the daily maximum published by Wunderground rather than a citywide average or a separate forecasting model. With the current crowd price at **0% YES**, the market is effectively pricing an outcome outside the visible range of expectations, so any move will depend on whether intraday warmth at the airport station materially exceeds the broad London forecast.

That zero reading sits against a fairly ordinary August pattern for London, where published seasonal guidance points to daytime highs around the low 20s Celsius, while live forecasts for 2 August have centred on the mid-to-high 20s under settled conditions. Polymarket’s own market page showed the leading outcome at **27°C** with **26°C** next, and noted that revisions to temperatures within the window can still count until the first datapoint for the following date is published[1][2][9]. For accessibility, the market is generally relevant to users facing platform checks: “**no-KYC up to $1,500**” means a trader can usually interact without identity verification only until cumulative activity reaches that threshold, after which verification is typically required; for German users, the GlüStV framework can make exchange-style betting or wagering products materially harder to access, while US traders face the separate question of whether a venue falls within CFTC reach and therefore restricts or excludes US participation altogether.

For traders, the key catalysts are the morning-to-midday temperature path, any cloud-break timing, and whether southerly flow keeps the airport station warmer than central London. Forecast revisions matter because the market resolves to the **single highest reading** logged at that station on the day, so a brief spike can beat a broadly mild afternoon if it lands before the final observation window closes. Weather services and market pages also indicate that late updates can still change the outcome if the relevant daily record is adjusted before the next day’s first datapoint is published[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in London on August 2? 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

On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.

FAQ

How are winnings taxed?

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.

Can I trade anonymously?

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.

What happens during a tax audit?

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.

Are prediction markets gambling?

Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.

Is there a withdrawal cap?

No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).