Highest temperature in Hong Kong on July 27?

Platform comparison

Market context

The Hong Kong heat contract is pricing at **0% YES** for every listed outcome right now, so the market is effectively saying none of the temperature bands is being assigned any live probability on Polymarket today.[2] For traders, that matters because the contract settles from the Hong Kong Observatory’s **“Absolute Daily Max (deg. C)”** reading for 27 July, with each winning outcome redeemable for **$1 in USDC** via Polymarket’s conditional-token structure on Polygon once the official extract is finalised.[2]

That zero-price backdrop is best read against how July weather in Hong Kong can swing sharply between heavy rain and bursts of heat. A July climate forecast page for Hong Kong points to **very wet conditions**, with rainfall expected over many days, which can suppress daytime highs even in midsummer.[1] By contrast, a comparable Polymarket temperature market for Hong Kong on 19 July 2026 ultimately resolved at **30°C**, showing that the city can still post a high daytime maximum when the weather breaks the other way.[3]

What a trader should watch is the timing and content of the Hong Kong Observatory’s daily extract, plus any late-session weather shifts that affect the final maximum before the observation window closes at **12:00 UTC**. The market will not settle until the official HKO data is published, so the practical catalyst is not a forecast headline but the released **Daily Extract** itself; until then, prices on Polygon can reprice quickly as participants react to updated rainfall, cloud cover and temperature guidance.[2]

Sources: 1 · 2 · 3

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 PolyGram, 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 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.

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 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.