Highest temperature in Hong Kong on August 10?

Platform comparison

Market context

Hong Kong’s hottest reading on 10 August will be the Hong Kong Observatory’s **Absolute Daily Max** in Celsius, which is the value that settles this market rather than any district-level or felt-temperature reading. That matters because the Observatory’s own headquarters record is the official benchmark, and on the comparable 10 August in 2025 the maximum there reached **34.4°C**, while the climatological daily normal maximum for 10 August is **31.4°C**.[3][4]

The current **0% YES** crowd price is difficult to reconcile with the weather setup already in place. Hong Kong has just logged an extreme heat event, with the Observatory reporting **36.9°C** and media attributing the spike to Typhoon Dolphin’s warm-air influence, so the market is already starting from an elevated thermal baseline rather than a cool-season norm.[1][15] On Polymarket, that probability is shown directly; on Kalshi or Betfair-style books, the same view would usually be expressed through contract price or decimal odds, and fees/KYC can differ materially, with exchange-style platforms typically charging commissions and applying broader account checks than on-chain markets.

The main catalysts are the Observatory’s hourly readings, the day’s forecast evolution, and any late changes to local wind, cloud, or rain associated with nearby tropical systems. Public weather notices showed 29°C at the Observatory at 6 a.m. on 10 August, indicating a hot start, while forecast services for Hong Kong were already calling for highs around the mid-30s Fahrenheit-to-Celsius equivalent range, which supports the upper end of the market’s listed outcomes.[11][10] Traders should also watch when the Observatory publishes the final daily extract, because this market cannot resolve until that dataset is posted.[7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest 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 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.

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.

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.