Highest temperature in London on July 21?

Platform comparison

Market context

On 21 July 2026, the highest temperature recorded at London City Airport will settle this market into one of several defined ranges. The resolution source is Wunderground's historical weather data for that specific station and date, with settlement occurring at 12:00 UTC on the same day. The 1% crowd probability suggests traders expect a notably warm outcome, though the precise threshold triggering that assessment depends on which temperature band the market operator has defined.

London's July temperatures have historically ranged between 20°C and 28°C at City Airport, with occasional peaks above 30°C during heat waves. The summer of 2022 saw UK temperatures exceed 40°C in some regions, though London typically remains cooler. Comparable July markets from prior years show that extreme heat events—those pushing above 32°C—occur roughly once per decade in the capital, which contextualises why the crowd has priced a high-temperature outcome at just 1%. Recent Met Office seasonal outlooks favour near-normal temperatures for summer 2026, though this remains a long-range forecast with substantial uncertainty.

From a regulatory standpoint, this market's accessibility depends on the operator's jurisdiction and user location. Under Germany's GlüStV (gambling licensing framework), prediction markets may require specific licensing; US CFTC oversight applies to derivatives on real-world events if US persons participate. Many platforms offer no-KYC trading up to $1,500 notional exposure, which typically permits this weather market without identity verification for smaller positions. Traders should verify their operator's compliance posture before placing orders, particularly if based in regulated jurisdictions.

Methodology

This overview of Highest temperature in London on July 21? 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. Is Polymarket Legal in Canada has a different geo footprint.

Do I need to KYC for Is Polymarket Legal in Canada?

Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.

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 Polymarket Legal in Canada 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.

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).