Lowest temperature in Hong Kong on August 10?

Platform comparison

Market context

Hong Kong’s overnight low on 10 August will be set by the Hong Kong Observatory’s final “Absolute Daily Min” reading, published later in the Daily Extract rather than by intraday headlines or private forecast apps. With the market currently at **0% YES**, traders are effectively saying the final minimum will land outside the contract’s YES range, even though HKO’s own daily climate normals show 10 August typically produces a mean minimum around the mid-20s Celsius, not a cool outlier.[6][15]

That framing matters because August in Hong Kong is usually warm and humid, with typical lows clustered in the high 20s Celsius and published August summaries commonly showing lows around 24.7°C to 28°C, depending on the source and averaging method.[4][5][12][18] The key comparable is not a single forecast but the tail risk of an unusually cool dawn from rain, cloud cover, or a passing weather system; HKO’s 2024 and 2025 monthly write-ups show that the Observatory’s daily records can diverge meaningfully from seasonal normals when synoptic conditions change.[7][16] On prediction venues, that sort of outcome often gets priced more cleanly on Polymarket’s implied-probability view, while Kalshi and Betfair-style books expose users to contract price and market depth rather than a direct percentage; Smarkets typically adds another layer through its exchange commission structure, so the same weather view can look cheaper or tighter depending on fees and liquidity.

For catalysts, the main watchpoint is the HKO publication cycle: the market cannot resolve until the official 10 August Daily Extract is finalised on the Observatory site, so the decisive input is the post-day data release, not the morning forecast. Short-term updates from HKO’s regional readings, plus any revised local weather warning, are the only inputs that can materially shift expectation before settlement.[1][2] For traders comparing books, KYC access also matters: Polymarket has broader crypto-native reach, while Kalshi and Betfair are more jurisdiction- and verification-dependent, and those access frictions can affect how quickly this low-liquidity weather line re-prices once the final reading is close.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Lowest temperature in Hong Kong on August 10? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

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. Robinhood Prediction Markets 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. Robinhood Prediction Markets 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.