Highest temperature in Hong Kong on July 27?

Platform comparison

Market context

Polymarket is pricing this Hong Kong high-temperature contract at **0% YES** today, even though the underlying event is straightforward: the Hong Kong Observatory’s recorded **absolute daily maximum** on 27 July will decide the range. On Polymarket, buyers are holding **USDC** on **Polygon**, and the contract settles through **conditional tokens** once the Observatory publishes the final daily extract for the date. The market cannot resolve until that data is finalised, and the relevant figure is the Observatory’s Celsius reading to one decimal place.

For context, July in Hong Kong is usually hot enough that the upper end of the day is rarely a surprise. Climatology sources put the July average high around **32°C**, with humid, rainy conditions and frequent storm risk, so the distribution of outcomes is naturally skewed towards warm readings rather than mild ones.[1] That matters for reading a zero price: in prediction markets, a 0% print often reflects either a genuine belief that the contract is mis-specified, or a view that the exact resolution band is effectively out of reach rather than that Hong Kong will be cool. A recent comparison from another Hong Kong July temperature market also showed how quickly these contracts can settle once the Observatory confirms the daily maximum, with the final price moving to full resolution after the official figure was published.[3]

The main catalysts are operational rather than macro: the Hong Kong Observatory’s publication timing, any weather warnings or storm-driven cooling before the afternoon peak, and the exact cut-off for the settlement window. July skies can be volatile, with heavy rain or storms sometimes interrupting daytime heating even when the monthly baseline is hot.[1] Traders watching the book will usually focus on whether the Observatory has posted the day’s extract and whether the intraday forecast implies a lower-than-normal maximum, but the final trigger is the official daily extract rather than marketplace chatter.[1][3]

Sources: 1 · 2 · 3

Methodology

This page reviews Highest temperature in Hong Kong on July 27? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees.

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 Polymarket Alternative 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.

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.

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.

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.