Highest temperature in Tokyo on August 12?

Platform comparison

Market context

On 12 August 2026, the highest temperature recorded at Tokyo Haneda Airport Station will determine this market's settlement value, measured in degrees Celsius and sourced from Weather Underground's Daily Observations table rather than its summary figures. Tokyo's August climate typically peaks between 32–35 °C, though extreme heat events have pushed readings above 37 °C in recent years. The 0% crowd probability suggests traders currently expect no extreme heat threshold to be breached on that specific date, though August remains Japan's hottest month and Haneda's urban heat island effect can amplify readings relative to surrounding areas.

Historical August temperatures at Haneda show considerable year-to-year variance. In August 2023, the station recorded a high of 35.1 °C; in August 2022, it reached 36.1 °C. The Japan Meteorological Agency's seasonal forecasts, typically released in early July, will provide the first official guidance on whether summer 2026 is tracking toward above-normal or near-normal heat. Traders should monitor the JMA's monthly outlooks from June onwards, as these influence broader expectations for the season and can shift probability assessments weeks before the resolution date.

From a regulatory standpoint, this market operates under differing frameworks depending on trader location. UK-based traders face no specific KYC requirement for positions under £1,500 notional value on weather derivatives, though the Gambling Commission's remit over prediction markets remains contested. German traders should note that weather prediction markets fall outside GlüStV gaming regulation if structured as financial derivatives rather than gambling contracts. US CFTC oversight applies to certain prediction markets, though weather-indexed contracts have historically received lighter scrutiny than political or event-based markets. Traders should verify their jurisdiction's treatment of weather derivatives before participation.

Methodology

This overview of Highest temperature in Tokyo on August 12? 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.

UK Frequently Asked Questions

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.

Is Polymarket regulated by the UKGC?

No. Polymarket is not licensed by the UK Gambling Commission (UKGC). It is a decentralised prediction market operated under US regulation. UK traders can use it but do not benefit from UKGC dispute resolution or player protection requirements.

What are the HMRC tax rules on Polymarket profits for UK traders?

Polymarket profits are treated as cryptocurrency disposal events by HMRC. Each USDC settlement is a taxable event subject to Capital Gains Tax (CGT). For 2026/27, the CGT rate is 18% (basic rate) or 24% (higher rate). The annual CGT exemption is £3,000. Report via HMRC Self Assessment if your total crypto gains exceed £3,000 or proceeds exceed £50,000.

Does Polymarket KYC apply to UK users?

Yes. Polymarket requires KYC (Know Your Customer) verification for all users, including UK residents. You must provide a government-issued photo ID and a selfie. The process typically takes 5–10 minutes via their ID verification provider.

What is the legal difference between Polymarket and Betfair Exchange for UK traders?

Betfair Exchange is UKGC-licensed, meaning UK consumer protections apply and winnings are typically tax-free. Polymarket is not UKGC-licensed — it operates under decentralised blockchain rules. Profits from Polymarket are subject to HMRC CGT as crypto disposals. Choose based on your regulatory preference and tax situation.