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Highest temperature in Hong Kong on July 31?

Regulatory snapshot for "Highest temperature in Hong Kong on July 31?": platform geo-block status, KYC thresholds, tax implications.

27°C 98% 28°C 3% 29°C 1% 24°C or below 0% Volume: $115K Liquidity: $156K Closes: 31 Jul 2026
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Highest temperature in Hong Kong on July 31?

Platform comparison

PlatformYES oddsNO oddsFeeKYCSettlement
Polymarket (via Polymarket Legal UK) Pick
polygram.ink (preferred broker)
98% 2% 0% (USDC on-chain) No-KYC up to $1,500 USDC, auto via UMA oracle Trade this market →
Polymarket (direct)
polymarket.com
98% 2% 0% Geo-blocked in US/UK/EU USDC, on-chain Trade this market →
Kalshi
kalshi.com
Up to 7% per trade US-only, KYC required USD Trade this market →
Betfair Exchange
betfair.com
2-5% commission Full KYC from first trade GBP / EUR Trade this market →
Manifold Markets
manifold.markets
Play-money (mana) None — play-money Mana (no cash-out) Trade this market →

Outcome probabilities

Current market-implied probability for each outcome, from the live order book.

OutcomeProbability
27°C98%
28°C3%
29°C1%
24°C or below0%
25°C0%
26°C0%
30°C0%
31°C0%
32°C0%
33°C0%
34°C or higher0%

Market context

Hong Kong’s hottest reading on 31 July will be set by the Hong Kong Observatory’s published **Absolute Daily Max** for the day, which is the figure this market uses for settlement. The city’s July climate profile makes a low-teens or even upper-30s outcome plausible in some years, but the observatory’s July records show the monthly maximum has reached **35.7°C** and **35.6°C** in past Julys, while a separate 2023 July report recorded **36.1°C** at the observatory on 27 July during an especially hot spell.[3][8]

The current **0% YES** crowd price reads as a hard scepticism about a top-end outcome, but that level often reflects market caution rather than a meteorological forecast. Comparable Hong Kong summer cases show how quickly the city can swing between ordinary 31–33°C afternoons and exceptional spikes above 35°C when heat, sunshine and local terrain align; recent reporting also shows the Observatory has already logged highs around **31.6°C** and **31°C** in other years, with parts of the New Territories running hotter than the city-centre station.[5][12]

For accessibility, the market sits within the usual prediction-market compliance layer rather than a pure weather bet: German **GlüStV** rules can affect whether participation is classed as gambling and therefore restricted for users in Germany, while the **US CFTC** position matters because event-contract venues can face US regulatory scrutiny if they serve American users or markets deemed to fall within commodity-event jurisdiction. A stated **“no-KYC up to $1,500”** threshold generally means smaller positions may be opened without full identity verification, which lowers friction for casual access but does not remove jurisdictional limits, sanctions screening, or platform-specific withdrawal controls.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in Hong Kong 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. Polymarket Legal UK has a different geo footprint.
Do I need to KYC for Polymarket Legal UK?
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.
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. Polymarket Legal UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
What if regulation changes?
If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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