Highest temperature in Hong Kong on July 27?

Platform comparison

Market context

The Hong Kong Observatory’s official daily maximum for 27 July will decide this contract, and the current **0%** crowd-implied pricing on Polymarket points to a view that the day will not print any of the listed outcomes as likely enough to attract a bid. That is notably more pessimistic than the broader weather backdrop, which is still consistent with a hot, humid late-July pattern in Hong Kong even with frequent rain interruptions; one July climate summary for Hong Kong highlights substantial monthly rainfall rather than a clean, stable heat signal.[1][2]

For context, Hong Kong’s July highs often sit in the upper 20s to low 30s Celsius, so a market at zero across the board is best read as thin confidence rather than a strong forecast of an extreme outcome. A recent nearby comparator also showed how quickly these contracts can collapse to a single official reading: on 19 July, a separate Hong Kong temperature market resolved to **30°C** after the Observatory confirmed that exact daily maximum.[3] There is no visible sportsbook line in the supplied results to compare directly, so the meaningful contrast here is between the exchange’s flat **0%** pricing and the historical tendency for Hong Kong to deliver a mid- or high-20s result when weather systems do not suppress daytime heating.

Traders should watch for the Hong Kong Observatory’s final “Daily Extract” publication, because the contract cannot resolve until the official file is posted and the “Absolute Daily Max” for the date is finalised. The main short-term catalyst is whether late-monsoon rain and cloud cover arrive early enough to cap daytime heating; the latest July overview for Hong Kong already flags wet conditions as a key feature of the month.[1][2] With settlement ending at 12:00 UTC on 27 July, any late update from the Observatory or a change in the day’s rainfall pattern would be the only material driver before resolution.[2]

Sources: 1 · 2 · 3

Methodology

We track Highest temperature in Hong Kong on July 27? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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 UK 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.