Highest temperature in London on July 20?

Platform comparison

Market context

The market tracks the highest temperature recorded at London City Airport on 20 July 2026, a specific meteorological event that determines settlement. With the current crowd-implied probability for the YES outcome at 0%, the market has already resolved, as the final result is determined and trading is closed [1]. The leading outcome settled at 72–73°F, confirming the temperature fell within that range rather than the lower thresholds implied by the zero probability.

Historical weather data for London in late July typically shows highs between 20°C and 25°C, with extreme outliers rarely exceeding 30°C. The settled range of 72–73°F (approximately 22.2–22.8°C) aligns with standard seasonal patterns, suggesting the 0% probability reflected a consensus that the temperature would not breach higher thresholds. Comparable cases from recent years show similar consistency, where July 20 temperatures rarely deviate significantly from the mean, making extreme deviations unlikely for traders to anticipate before resolution.

Traders should monitor regulatory developments under Germany’s GlüStV and US CFTC guidance, which increasingly scrutinise prediction markets tied to real-world events. The ‘no-KYC up to $1,500’ threshold enhances accessibility for UK and EU users but remains subject to evolving compliance checks, particularly for weather-based markets that may face stricter classification. Recent announcements from the CFTC regarding digital asset derivatives suggest tighter oversight could impact settlement timelines, though this market’s closure precludes further trading activity [1].

Sources: 1

Methodology

This overview of Highest temperature in London 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

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

Is Polymarket legal in my country?

Polymarket is geo-blocked in the US/UK/EU. Actual usage via the Polymarket interface is not possible there. The legal status itself varies — many countries treat prediction markets as a gray area. Polymarket Tax UK has a different geo footprint.

Can I trade anonymously?

Pseudonymously, yes — up to the KYC threshold. Polymarket Tax UK 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.

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).

What if regulation changes?

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