Highest temperature in Tokyo on August 21?

Platform comparison

Market context

On 21 August 2026, the highest temperature recorded at Tokyo Haneda Airport Station will fall within one of several defined ranges in degrees Celsius. The market resolves using the Daily Observations table from Weather Underground rather than summary figures, a distinction that matters when intraday peaks diverge from headline highs. Settlement occurs at 12:00 UTC on that date, locking in the official reading regardless of any subsequent adjustments to historical data.

August in Tokyo typically sees peak temperatures between 32–35°C, with occasional extremes exceeding 36°C during heat waves. The current 0% crowd probability suggests traders are either awaiting range options or treating this as a placeholder pending fuller market definition. Historical August maxima at Haneda span from 29°C in cooler years to 37.4°C during the 2010 heat event, establishing a wide baseline. Comparable markets on East Asian summer temperatures have shown that late-August readings tend toward the seasonal mean rather than outliers, though climate variability and urban heat effects create genuine uncertainty.

Traders should monitor Japan Meteorological Agency forecasts issued in early August 2026, which typically provide 10–14 day outlooks for heat stress and temperature ranges. Pacific typhoon activity in late summer can suppress temperatures sharply, whilst high-pressure systems over the continent drive sustained heat. Any El Niño or La Niña conditions active during boreal summer will influence regional atmospheric patterns. The resolution mechanism's reliance on Haneda Airport data—rather than central Tokyo or alternative stations—means microclimatic factors at that specific location carry decisive weight.

Methodology

This overview of Highest temperature in Tokyo on August 21? 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?

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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.