Highest temperature in Hong Kong on August 5?

Platform comparison

Market context

Hong Kong’s peak temperature on 5 August will be set by the Hong Kong Observatory’s “Absolute Daily Max” reading for that date, published later in the relevant daily extract. The contract’s 0% YES implied probability is stark, and there is no obvious live pricing from sportsbooks to offset it, so the market is effectively treating a very hot outcome as negligible despite August’s normally humid, high-30s-style heat profile in some regional forecasts.

That low price sits against a climate backdrop where Hong Kong’s August highs are usually around 30–31°C, with occasional hotter spells and frequent rain or thunderstorms. Comparable late-summer readings can still push into the low 30s Celsius, so a zero-implied chance looks detached from the historical distribution rather than a precise read on tomorrow’s weather.

The main catalyst is the Observatory’s own daily data release after the settlement window closes at 12:00 UTC on 5 August, because the contract cannot resolve until the finalised extract is posted. Traders should watch the local forecast updates for any hot, dry break in the monsoon flow, but the more important dependency is the timing of the official daily extract, not the headline forecast alone.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets 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.