Highest temperature in Tokyo on August 19?

Platform comparison

Market context

On 19 August 2026, the highest temperature recorded at Tokyo Haneda Airport Station will determine the settlement of this market. The resolution will draw from Weather Underground's Daily Observations table—the granular, minute-by-minute dataset—rather than the rounded summary figures displayed in the Day High & Low section. This distinction matters: intraday peaks can differ materially from end-of-day summaries, and Wunderground's primary observational feed is the binding source for settlement.

Tokyo's August climate is stable within narrow bounds. Historical data from the Japan Meteorological Agency shows that August highs at Haneda cluster between 32–35°C, with extreme readings above 37°C occurring in fewer than 5% of years over the past two decades. The 0% crowd probability suggests traders are pricing in either an unusually cool August or are treating the market as illiquid. Comparable weather markets on prediction platforms show that temperature ranges with historical frequency below 10% typically receive minimal backing unless a specific heat event is forecast.

From a regulatory standpoint, this market's accessibility depends on jurisdiction. Under Germany's GlüStV (Glücksspielstaatsvertrag), prediction markets on weather fall outside gaming restrictions if structured as information contracts; however, operators must register with BaFin. In the US, the CFTC's exemption for prediction markets on non-financial events generally permits weather contracts, though state-level restrictions apply. For UK-based traders, the no-KYC threshold of £1,000–£1,500 (depending on platform interpretation of FCA guidance) means small positions in this market may settle without full identity verification, though larger stakes trigger standard customer due diligence.

Methodology

This overview of Highest temperature in Tokyo on August 19? 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.