Lowest temperature in Hong Kong on August 11?

Platform comparison

Market context

On 11 August 2026, the Hong Kong Observatory will record the day's minimum temperature in degrees Celsius. This market resolves to whichever temperature band contains that single daily low, measured to one decimal place and published in the Observatory's official Daily Extract. The settlement window closes at midday UTC on that date, though resolution itself depends on the Observatory's data release schedule, which typically occurs within days of observation.

Hong Kong's August temperatures are remarkably consistent year-on-year. Historical data from the Observatory shows absolute daily minima in August cluster between 24°C and 27°C, with the month's coldest days rarely dropping below 23°C even during tropical downturns. The 0% crowd probability suggests either the market has not yet attracted liquidity or traders expect the lowest temperature to fall outside the lowest available band. Comparing across platforms: Polymarket displays implied probabilities directly; Kalshi and Betfair present decimal odds requiring conversion; Smarkets uses similar fractional odds to Betfair. Fee structures vary—Polymarket charges 2% on winnings, Kalshi 5%, and Betfair's commission scales with volume—affecting expected returns on low-probability outcomes.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any tropical cyclone warnings issued in early August 2026, as these drive short-term temperature volatility. The Observatory publishes monthly climate summaries and maintains real-time weather data; any unusual atmospheric patterns in the weeks preceding 11 August would signal deviation from the historical norm. KYC requirements differ across platforms, with Kalshi requiring full US-style verification whilst Polymarket and Betfair operate with lighter identity checks in most jurisdictions.

Methodology

We read Lowest temperature in Hong Kong on August 11? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.