Highest temperature in Tokyo on August 10?

Platform comparison

Market context

Tokyo’s reading will be set by the **highest temperature actually logged at Tokyo Haneda Airport Station** on 10 August, using Weather Underground’s Daily Observations table rather than the summary high/low box. That matters because prediction markets on weather often turn on the exact observation method, not the broad headline temperature, and Haneda’s coastal siting can differ from central Tokyo by a small but market-relevant margin. Japanese official climate data for Tokyo shows August daily highs commonly sit in the low-to-mid 30s °C, with recent 10 August values reaching the mid-to-high 30s in hotter years, so a 0% crowd price implies the market is treating an extreme outcome as the base case rather than a weather-normal one.[8][10][2]

The historical frame is straightforward: Tokyo has a well-established late-summer heat profile, and recent reporting shows Japan has repeatedly faced record or near-record heat in August, including a new national high of 41.8°C in 2025 and multiple days above 35°C in Tokyo itself.[13][19][4] For a temperature band market, that history argues against reading 0% literally as a physical forecast; it more likely reflects low liquidity, a stale book, or a different interpretation of the payoff range. On-accessibility, a platform advertising **no-KYC up to $1,500** means smaller positions may be available without full identity verification, but that does not remove tax or regulatory exposure once activity scales or jurisdictional rules bite.

The main catalysts are meteorological, not political: the relevant inputs are the day’s synoptic setup, any heat advisory or typhoon-induced cloud/rain shielding, and the timing of the day’s peak heating before the settlement window closes at 12:00 UTC. For legal context, German users can face **GlüStV** restrictions if the market is treated as gambling-like, while US participants may still be exposed to **CFTC** reach if the venue or activity falls within US derivatives enforcement theory. The practical trading issue is whether Weather Underground’s station-level archive updates cleanly and whether the Daily Observations table captures the day’s maximum before the window ends.[16][7]

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

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.