Highest temperature in Hong Kong on July 23?

Platform comparison

Market context

Polymarket is pricing the Hong Kong Observatory’s reported peak for 23 July at a **34°C** outcome most heavily, with that bucket at 60%, while **33°C** sits second at 26%. On Polymarket, traders are expressing those views in USDC on Polygon through conditional tokens, so the price is a live read on where the crowd thinks the day’s official maximum will land once the Hong Kong Observatory publishes its daily extract.

For context, the market is really about how often Hong Kong gets pushed into the mid-30s in late July, rather than about an abstract summer average. Travel China Guide says July is Hong Kong’s hottest month, with an average high of **32°C** and heavy rainfall still common, which matters because cloud cover and storms can suppress the day’s maximum even in a hot spell.[2] That makes the current 34°C-heavy pricing a fairly specific bet on a warm but not extreme afternoon, rather than on a broader heatwave outcome.[1][2]

A trader’s main watch-items are the Observatory’s own release schedule and any weather systems passing through the South China coast, because the market cannot resolve until the relevant “Daily Extract” is published and the final “Absolute Daily Max (deg. C)” is available from the Hong Kong Observatory.[1] In practical terms, that means front-page rain warnings, typhoon-related disruptions, or a cooler maritime flow could shift the printed maximum away from the current centre of gravity; absent that, the market is signalling that mid-30s remains the most likely settlement band.[1][2]

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 Kalshi 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 Kalshi 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.

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.