Lowest temperature in Hong Kong on August 11?

Platform comparison

Market context

Hong Kong’s official low for 11 August will be set by the Hong Kong Observatory’s daily extract, and the market settles on the **absolute minimum** temperature in **degrees Celsius** once that record is published. In practical terms, the key question is whether the day’s minimum lands anywhere near the mid-20s Celsius that is typical for August, or whether an unusual weather pattern drags it materially lower.[1][3][5]

For context, the Observatory’s August normals put 11 August at a mean minimum of **26.7°C**, with the month as a whole usually sitting around **25.7–27°C** overnight in Hong Kong.[3][6][7] That makes a 0% crowd-implied chance on Polymarket a strong statement that no unusually cool outcome is expected. On other books, the same view is often expressed differently: Polymarket shows an implied probability, while Kalshi and Smarkets usually trade in price terms around 0–100, and Betfair uses decimal odds, so the same sentiment can look less stark depending on the venue and fee drag.

Traders should watch the Hong Kong Observatory’s published weather updates, any tropical-cyclone or rainstorm developments, and the timing of the daily extract itself, because this market cannot resolve until the data for that date is finalised.[1][5][10] Recent Observatory and news reports show Hong Kong can still produce extreme August heat, including a 36.9°C record high on 9 August 2026, which matters mainly as a reminder that the city’s weather can swing sharply even within the same week.[16][18] Access also differs by platform: Polymarket is crypto-native, while Kalshi, Betfair and Smarkets have different KYC and jurisdictional reach, so the usable price signal may be fragmented even before fees are considered.

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

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

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. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.