Lowest temperature in Hong Kong on August 11?

Platform comparison

Market context

Hong Kong’s overnight minimum is the figure that matters here, not the daytime heat. The Hong Kong Observatory says the market will settle on the **“Absolute Daily Min (deg. C)”** from the published Daily Extract for 11 August 2026, and it only resolves once that data is finalised. August in Hong Kong is typically very warm and humid, with the Observatory’s 1991–2020 normals putting 11 August at a mean minimum of **26.7°C** and a mean temperature of **28.7°C**, so the current crowd-implied **0% YES** looks like a statement that an unusually low reading is not being priced in.[3][11]

Past and comparable cases suggest that sub-25°C outcomes are rare in August, even if rain or a weather system briefly suppresses temperatures. A government report on August weather noted that on 11 August 2025 the Observatory’s minimum fell to **25.7°C**, described as the lowest of that month, which is still well above the cooler ranges typically implied by many temperature brackets.[8] For platform comparison, Polymarket usually presents this kind of market in simple implied-probability terms, while Betfair and Smarkets often surface decimal odds or exchange-style prices that make thin-likelihood outcomes easier to compare across books; the practical difference is that fees, spreads and access rules can matter more than the headline price when the event is sitting near zero probability.

For traders, the key catalyst is the Observatory’s daily release itself: the result cannot be confirmed until the 11 August entry appears in the relevant climate extract, and the market can remain open until that publication is complete.[11] Intraday weather trends matter only indirectly, because the final settlement uses the official Observatory minimum rather than live app readings; that said, Hong Kong’s forecast for 11 August shows a hot, cloudy day with overnight lows still in the high 20s Celsius, which supports the view that the settlement range is likely to stay above the lower brackets.[16][17]

Sources: 1 · 2 · 3 · 4 · 5

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

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.