Highest temperature in Hong Kong on August 10?

Platform comparison

Market context

Hong Kong’s highest temperature on 10 August will be set by the Hong Kong Observatory’s official **Absolute Daily Max** for that date, measured to one decimal place and only resolved once the Daily Extract is published. The market is therefore about the day’s final Observatory peak, not an early-afternoon reading or temperatures elsewhere in the territory; in practice, that means traders need to watch whether the city gets another sharp heat spike before the day is complete.[12][19]

The recent comparison point is that Hong Kong has just logged extreme heat under Typhoon Dolphin, with the Observatory reporting **36.9C** on 9 August, its highest figure since records began in 1884.[1][9][17] That matters because a 0% crowd-implied probability can move quickly if the weather regime stays hot: August norms for 10 August are far lower, with a mean maximum around **31.4C**, while 2025’s 10 August maximum at the Observatory reached **34.4C**.[4][3] On Polymarket, the market is typically framed as a straight probability; on Kalshi, the same view is usually expressed through contract prices and maker-taker economics, while Betfair and Smarkets add exchange-style commission and may present the same event through decimal odds, so identical sentiment can look very different after fees and formatting.

The main catalysts are the Observatory’s hourly readings, any late-day convective heating, and whether the post-typhoon air mass persists long enough for temperatures to challenge the official record site.[12][19] Traders should also check the publication timing of the relevant Daily Extract, because this market cannot settle until that file is posted. For cross-platform access, KYC and eligibility can diverge materially: Polymarket and Kalshi are more tightly tied to jurisdictional screening, whereas Betfair and Smarkets generally operate as regulated betting or exchange venues with their own verification and availability rules, so the same weather view may be accessible in one book and blocked or differently priced in another.

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 Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

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.

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

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. Kalshi 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.