Highest temperature in Tokyo on August 18?

Platform comparison

Market context

On 18 August 2026, Tokyo's highest temperature will be recorded at Haneda Airport Station and measured in degrees Celsius. The market resolves using Weather Underground's Daily Observations table rather than the Day High & Low summary, a distinction that matters when automated systems or manual corrections produce conflicting readings. Settlement occurs at 12:00 UTC on that date, giving traders a fixed window to assess the overnight low and any early-morning readings before the official high is locked.

Historical August temperatures at Haneda show a median daily high near 32–33°C, with extremes ranging from 28°C in cooler years to 37°C during heat waves. The 0% crowd probability suggests either extreme confidence in a specific temperature band or sparse trading activity; comparable weather markets on this platform typically see meaningful probability shifts only when seasonal forecasts update or when a heat advisory is issued within 72 hours of settlement. August 2026 forecasts from Japan Meteorological Agency will be the primary catalyst; any El Niño or La Niña signal affecting the Western Pacific could shift expectations by 1–2°C.

Regulatory access to this market depends on jurisdiction. Under German GlüStV rules, prediction markets require a licence; most EU traders face KYC requirements regardless of stake size. US CFTC oversight applies to derivatives-like contracts, though binary weather outcomes often fall outside direct regulation if the platform operates outside US territory. Platforms offering "no-KYC up to $1,500" typically mean unverified accounts can trade notional amounts below that threshold, but this market's settlement in August 2026 may trigger verification requirements at withdrawal, particularly for non-EEA users.

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.

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.

Can I trade anonymously?

Pseudonymously, yes — up to the KYC threshold. Is Kalshi Legit stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.

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).