Highest temperature in Tokyo on August 10?

Platform comparison

Market context

Tokyo’s highest temperature will be set by the day’s peak reading at Haneda Airport, and the market uses Weather Underground’s *Daily Observations* rather than any summary box. Tokyo’s August climate is already hot and humid, but the range of plausible outcomes is broad: historical 10 August data for Tokyo include highs from the high 20s to the mid-30s Celsius, with recent years often landing around 31–36°C and some exceptional days much hotter.[1][3][9]

The current 0% crowd price is best read as a statement of *very early information disadvantage*, not as a forecast of impossibility. Comparable August records show that Tokyo can easily reach the low-to-mid 30s, while Japan has repeatedly produced extreme heat headlines in recent summers, including Tokyo’s run of 35°C-plus days and national records elsewhere in 2025.[2][11][18] For a prediction market, that means the relevant question is not whether Tokyo can be hot enough, but whether the observed peak at Haneda lands inside the settlement band assigned by the contract.

From a market-access perspective, German GlüStV treatment matters because prediction markets can face tighter local gambling classification and advertising or participation limits under German rules, even when the platform is offshore or crypto-native. In the US, the CFTC’s reach is relevant because event contracts may be treated as derivatives in some circumstances, so venue structure and user location can affect accessibility. A “no-KYC up to $1,500” policy generally means smaller balances or withdrawals can be used with lighter identity checks, which may widen access for casual participants, but it does not remove jurisdictional restrictions and does not guarantee universal eligibility for this specific weather market.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in Tokyo on August 10? 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

Do I need to KYC for Polymarket Legal UK?

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.

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.