Highest temperature in Hong Kong on July 23?

Platform comparison

Market context

Hong Kong’s highest temperature on 23 July will be set by the Hong Kong Observatory’s final **Absolute Daily Max** reading for that date, so the practical question for traders is whether the day clears the low-30s band or gets held down by cloud and rain. July is Hong Kong’s hottest month on average, with typical highs around **32°C**, but it is also one of the wettest periods, which makes the daily maximum more volatile than the monthly average suggests.[2]

The current **0% YES** crowd-implied price should be read as a market inefficiency rather than a temperature signal, because the live book on comparable outcomes has already assigned meaningful weight to the upper-30s range: one public market snapshot shows **34°C at 46%** and **33°C at 36%** as the leading outcomes.[1] For a programmatic trader, that means the key input is not the headline seasonal average but the exact probability distribution around the day’s peak, then mapping that distribution to the market’s temperature buckets and any last-hour updates from the weather feed.

The catalysts to watch are the Observatory’s daily updates and the eventual publication of the **Daily Extract**, since this market cannot resolve until the official data for 23 July is posted.[1] In a tooling workflow, that usually means polling the source page, checking whether the “Absolute Daily Max” has been finalised, and avoiding assumptions from near-real-time forecasts once convective rain, typhoon effects, or overnight cloud cover change the intraday maximum profile.

Sources: 1 · 2

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 Kalshi Fees, 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 Kalshi Fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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'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.