Highest temperature in Tokyo on July 4?

Platform comparison

Market context

On 4 July 2026, the Tokyo Haneda Airport Station will record its peak temperature for the day, a single data point that determines whether the market resolves to the 26°C range or higher. This real-world event is not speculative; it is a measurable outcome of atmospheric conditions during Japan’s hottest season, where daily highs routinely exceed 30°C and humidity often surpasses 95%.

Historical precedent strongly undermines the current 0% crowd-implied probability for the 26°C range. Mid-to-late July in Tokyo and Osaka consistently hits 36 to 40°C, with recent records showing Japan’s highest-ever temperature at 41.2°C in Tamba City just last month[7]. Even the Haneda forecast for July 2026 predicts daily highs between 76°F and 91°F (24°C to 33°C), meaning temperatures below 26°C are statistically improbable during peak summer heat[3]. The market’s current pricing ignores these robust comparable cases, creating a significant misalignment with observed weather patterns.

Traders should monitor the Japan Meteorological Agency’s daily heatwave bulletins and Wunderground’s live temperature feeds for Haneda, as these are the primary dependencies for resolution. Recent news confirms Japan recorded its hottest July since 1898, with multiple locations exceeding 40°C, suggesting extreme heat is the prevailing trend rather than an anomaly[10]. Regulatory accessibility remains a key factor: under German GlüStV and US CFTC frameworks, markets offering “no-KYC up to $1,500” allow retail participants to access this specific temperature bet without identity verification, provided the stake stays within the threshold. This structure enhances liquidity while maintaining compliance with cross-border gambling regulations.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in Tokyo on July 4? 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.

FAQ

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. Is Kalshi Legit has a different geo footprint.

How are winnings taxed?

Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.

What happens during a tax audit?

You're responsible for documenting your trades. Is Kalshi Legit exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.

Are prediction markets gambling?

Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.

Is there a withdrawal cap?

No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).