Highest temperature in Tokyo on August 18?

Platform comparison

Market context

On 18 August 2026, the highest temperature recorded at Tokyo Haneda Airport Station will fall into one of several defined ranges measured in degrees Celsius. The market resolves using Weather Underground's Daily Observations table rather than its Day High & Low summary, a distinction that matters when discrepancies arise between automated station feeds and post-processed summaries. Tokyo's August temperatures typically range between 28–35°C, though heat waves can push readings above 37°C. The current crowd probability of 0% suggests either extreme confidence in a specific temperature band or insufficient liquidity to establish meaningful odds across all ranges.

Historical August temperatures at Haneda show considerable year-to-year variance. The Japan Meteorological Agency recorded 37.5°C on 16 August 2023 during a notable heat event, whilst cooler Augusts have seen daily highs near 28°C. This volatility means traders should distinguish between typical seasonal patterns and anomalous conditions. The 0% reading across all ranges indicates the market may lack sufficient participation to calibrate probabilities, making early entry potentially valuable if you hold a view on mid-to-late summer weather patterns in the Kanto region.

From a regulatory standpoint, this market's accessibility depends on jurisdiction. Under German GlüStV rules, prediction markets operating without a licence face restrictions on marketing to residents. US CFTC oversight applies if the platform accepts American users, though weather derivatives typically fall outside commodity futures regulation. Many platforms offer no-KYC trading up to $1,500 notional exposure, meaning traders can participate without identity verification below that threshold—relevant for smaller positions on temperature ranges with wide confidence intervals.

Methodology

This overview of Highest temperature in Tokyo on August 18? 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.