Highest temperature in Hong Kong on July 25?

Platform comparison

Market context

Polymarket is pricing the Hong Kong Observatory’s 25 July maximum temperature contract at just 2% for a YES outcome, which is a very low implied chance for the market’s highest bucket. On Polymarket, that price reflects traders’ expectations in USDC on Polygon through conditional tokens, so the number matters more as a live consensus than as a forecast of the weather itself.

For context, Hong Kong’s July climate is typically hot and humid, with average highs around 32°C and frequent rainfall, but the market only resolves to the Observatory’s recorded daily maximum once the final Daily Extract is published. Current front-runners across the listed bands sit around 33°C and 34°C at 32% each, suggesting traders are clustering around a warm but not extreme outcome rather than a broader heat spike.[1][3]

The main catalysts are the Observatory’s end-of-day observation, any late-day weather swings from showers or thunderstorms, and the timing of the final publication rather than the midday trading window. Traders should watch the Hong Kong Observatory’s daily extract feed and any local weather updates through the afternoon and evening, since the settlement value depends on the final “Absolute Daily Max (deg. C)” and cannot resolve until that data is posted.[1][3]

Sources: 1 · 2 · 3

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 PolyGram. 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 PolyGram 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.