Highest temperature in Hong Kong on August 6?

Platform comparison

Market context

Hong Kong’s **6 August** high is being priced as a near-certainty for a *low* band, with the market’s 0% implied probability on the top-end outcome suggesting the crowd sees little chance of an unusually hot reading. That is broadly consistent with the climatology: the Hong Kong Observatory’s normal for 6 August puts the day’s maximum temperature around **31.6°C**, while August forecasts and long-run weather guides point to typical highs in the low 30s rather than anything extreme.[3][1][9]

On comparable summers, the more relevant handicapper’s question is not whether Hong Kong can get hot, but whether it gets hot enough to challenge the upper temperature bands. The Observatory described August 2024 as “an exceptionally hot August”, with a mean daily maximum of **32.3°C**, and local reporting noted record-breaking heat in 2025 as well.[5][18] That history keeps the favourite on the warmer ranges, but it also limits the contrarian case for the very highest brackets unless a clear heat surge develops; the value, if any, is usually in guarding against overconfidence in the coolest bins when the seasonal baseline is already high.[5][18]

For traders, the key catalyst is the Hong Kong Observatory’s final **Daily Extract** for 6 August, because the market resolves on the published **Absolute Daily Max (deg. C)** and cannot settle until the data is finalised.[Market description] Intraday weather changes, afternoon convection, and any late update to the Observatory’s daily extract matter more than headline forecast graphics, especially because the resolution uses Celsius to one decimal place.[Market description] The live HKO current-weather feed and August climate pages are the main dependencies to watch as the day progresses, with any unexpected sunnier, drier afternoon creating the only realistic path to upside versus the consensus range.[4][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.