Lowest temperature in Hong Kong on August 17?

Platform comparison

Market context

On 17 August 2026, the Hong Kong Observatory will record the day's lowest temperature in degrees Celsius. This market settles on that single data point, published in the Observatory's Daily Extract once the meteorological day closes. The current 0% implied probability reflects either extreme confidence in a warm minimum or, more likely, sparse early trading activity on a specific future date without established seasonal benchmarks yet priced in.

Hong Kong's August climate is characterised by high humidity and typhoon season activity. Historical August minima typically range between 24–26°C in the urban core, though the Observatory's measurement site at King's Park records slightly cooler readings than harbour-side stations. Comparable August 17th data from prior years shows minima clustering in the mid-to-high 24°C range; extreme lows below 22°C are rare in August and would require unusual weather systems. Traders comparing Polymarket's binary or range-based options against Kalshi's decimal odds structure will find this market's settlement precision—to one decimal place—favours platforms offering granular temperature brackets rather than broad categorical bets.

Tropical cyclone forecasts issued in early August 2026 will be the primary catalyst. The Hong Kong Observatory publishes seasonal outlooks and typhoon warnings months in advance; any system tracking toward the region by mid-August could suppress daily minima. Traders should monitor the Observatory's official website and regional meteorological advisories from late July onwards. Settlement depends entirely on Observatory data publication; delays in the Daily Extract release could postpone resolution beyond the stated window, a dependency worth noting when comparing settlement timelines across Polymarket, Betfair, and Smarkets.

Methodology

This page compares Lowest temperature in Hong Kong on August 17? 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 Polymarket Alternative, 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.

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.

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.