Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
85% | 15% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
85% | 15% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Go to the live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Go to the live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Go to the live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Go to the live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 28°C | 85% |
| 27°C | 13% |
| 26°C | 4% |
| 25°C | 1% |
| 23°C or below | 0% |
| 24°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C or higher | 0% |
Market context
On 17 August 2026, the Hong Kong Observatory will record the lowest temperature for that calendar day in degrees Celsius. This market resolves to whichever temperature band contains that single daily minimum, measured to one decimal place and published in the Observatory's official Daily Extract records. Settlement occurs once the Observatory finalises and publishes the data, which typically happens within days of the observation date.
Hong Kong's August temperatures are constrained by geography and season. The city sits in a subtropical monsoon zone where August is the height of summer; daily minima during this month historically cluster between 25 and 27 degrees Celsius, with recorded lows rarely dropping below 24 degrees. The current 0% crowd probability on lower temperature bands reflects this seasonal reality—a minimum below, say, 20 degrees Celsius in mid-August would require exceptional meteorological conditions such as a major typhoon or cold front, events that do occur but remain statistically uncommon for that specific date window. Comparable August days from prior years show the Observatory's data exhibits tight clustering around the 25–27 range, making extreme outliers improbable rather than impossible.
Traders should monitor the Hong Kong Observatory's typhoon and weather alerts in the fortnight preceding 17 August 2026, as tropical cyclone activity is the primary catalyst for temperature deviation. The Observatory publishes daily forecasts and storm warnings at weather.gov.hk; any named system tracking toward Hong Kong in early-to-mid August would materially shift probability distributions. Additionally, the final settlement depends entirely on the Observatory's publication schedule—delays in data release can postpone resolution beyond the nominal settlement window, though this is rare for routine daily temperature records.
Methodology
This overview of Lowest temperature in Hong Kong on August 17? 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
- 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.
- What happens during a tax audit?
- You're responsible for documenting your trades. Is Kalshi Legal in California 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).
- 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.
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