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 daily extract, so the key question is not whether it is summer heat, but whether the day lands in the low- or mid-30s Celsius. July is Hong Kong’s hottest month on average, with an average high of 32°C and heavy rainfall also common, which matters because cloud cover and rain can suppress the day’s peak even in peak summer.[2]

The current 0% YES price looks detached from the observable setup, especially given the market’s own distribution already places 34°C and 33°C as the leading outcomes.[1] For a power-user running this through tooling, the useful approach is to treat the market as a discrete temperature ladder: ingest the Observatory’s published “Absolute Daily Max” once the daily extract is final, map the value to the settlement band, and ignore intraday spikes unless they are officially recorded. Historical July conditions in Hong Kong often cluster around the low 30s, so the main risk is not an extreme outlier but whether the final reading comes in one notch above or below the crowded centre of the range.[2]

For traders watching catalysts, the decisive inputs are the Observatory’s day-by-day updates and any late changes to the daily extract rather than headlines alone, because the market cannot resolve until the official data are published. In practical terms, a conditional-order or bot workflow would be to monitor the Observatory’s release timing, refresh the value after the daily extract is posted, and compare it against the contract’s temperature buckets before settlement.

Sources: 1 · 2

Methodology

This page reviews Highest temperature in Hong Kong on July 23? 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 Bot 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 Bot UK. 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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Bot UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.