Highest temperature in Tokyo on July 31?

Platform comparison

Market context

Tokyo’s peak temperature on 31 July will be set by the highest reading at Haneda Airport Station during the day, so the relevant question is whether the city’s heat reaches the low- to mid-30s Celsius or breaks into a much rarer extreme. Tokyo’s July climatology is already warm, with long-run averages around 28–30°C and recent July daily highs often in the low 30s, while Tokyo’s all-time city record is 37°C, which gives some context for how much upside the market is actually pricing. [10][12][6]

The current **0% YES** crowd price looks conservative rather than impossible. Japan has just seen exceptional heat nationally, including 41.2°C in Tamba and then 41.8°C in Isesaki, both far above anything Tokyo itself usually posts, and reporting said July 2025 was the country’s hottest July on record. That matters because a strong regional heat pattern can lift Tokyo’s ceiling, but Haneda’s coastal location and the market’s use of the airport station mean local sea-breeze effects can keep the day’s maximum below inland records even when Japan-wide extremes are in the news. [9][14][7][8]

For accessibility and market structure, the main non-weather constraints are regulatory and platform-based. A German participant faces potential GlüStV friction if the venue is deemed a gambling product under German law, while US users should note that CFTC reach can matter if the market is interpreted as a derivatives-style event contract rather than a simple trivia-style bet; either way, that is a jurisdiction issue, not a forecast issue. “No-KYC up to $1,500” means a user can usually open and trade within that cumulative limit without full identity verification, but activity above that threshold typically triggers KYC checks, which affects how easily smaller traders can access this market rather than how the outcome is resolved.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in Tokyo on July 31? 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 Legal in California has a different geo footprint.

Do I need to KYC for Is Kalshi Legal in California?

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.

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).

What if regulation changes?

If regulation changes in your jurisdiction (e.g. prediction markets are banned), Is Kalshi Legal in California would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.