Highest temperature in Tokyo on August 8?

Platform comparison

Market context

Tokyo Haneda Airport’s afternoon maximum is the event that matters here, because the market resolves off the highest Celsius figure in Weather Underground’s Daily Observations table rather than the headline day-high summary. Current public forecasts are already pointing to a very warm day, with Tokyo broadly around 33–35°C and a sunny-to-partly cloudy profile, which makes the upper temperature bands the relevant ones for settlement rather than any exact rounded forecast number.[3][5][7][8]

The crowd price at 0% YES is easiest to read against Tokyo’s August climate, where heat is normal and mid-30s Celsius readings are common, but the precise airport-observation rule still introduces some basis risk versus city-wide forecasts. Comparable cases in Japanese summer weather markets often move only when the observed station reading comes in clearly below or above the forecast band, and the key issue is whether cloud cover, sea breeze, or showers cap the airport maximum before late afternoon. The settlement source choice matters because Weather Underground’s Daily Observations can differ from the summary display, and the market explicitly gives the table priority.[8][12][19]

For accessibility, the regulatory frame is not trivial: on the German side, the GlüStV framework can affect whether a resident-facing betting or gaming product is treated as permitted online gambling, while US-facing activity may still sit within the CFTC’s reach if a platform offers event contracts to US persons. “No-KYC up to $1,500” means the account can typically be used with lighter identity checks until that threshold is crossed, which improves access for smaller positions but does not remove jurisdictional, tax, or source-of-funds limits once a trader scales up.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in Tokyo on August 8? 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.