Highest temperature in Hong Kong on July 23?

Platform comparison

Market context

Hong Kong’s 23 July high is trading on Polymarket in USDC on Polygon through conditional tokens, and the market is currently pricing **34°C** as the frontrunner at **46%**, with **33°C** close behind at **36%**.[1] A **0%** crowd-implied chance for a YES-style outcome reflects how the contract has been segmented into temperature buckets rather than a binary weather call, so the practical question is where the Hong Kong Observatory’s final **“Absolute Daily Max”** lands once the daily extract is published.[1]

For context, July is Hong Kong’s hottest month on average, with a typical high around **32°C** and a low near **27°C**, but it is also one of the wettest periods of the year, with heavy rain and storms occasionally limiting peak temperatures.[2] That makes **33–34°C** a sensible centre of gravity for traders, especially when the market is still open before the Observatory’s finalised record is available.

The key catalyst is the Hong Kong Observatory’s daily climate extract for 23 July, because that finalised figure is the sole settlement source and the market cannot resolve until it is published.[1] In practice, traders should watch for the Observatory’s data release timing, any delay in finalisation, and whether local cloud, rain, or storm activity suppresses the day’s maximum relative to the July average.[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 PolyGram, 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 PolyGram. 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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.