Highest temperature in Hong Kong on July 6?

Platform comparison

Market context

The Hong Kong Observatory will record the absolute daily maximum temperature in degrees Celsius on 6 July 2026, with the market resolving to the specific range containing that figure. Today, Polymarket prices the YES contract for any temperature outcome at 0%, implying the crowd believes the event is impossible, yet this contradicts the on-chain reality where conditional tokens on the Polygon network allow USDC trading on every plausible range. The zero probability likely stems from a misunderstanding of the resolution mechanics rather than a genuine belief that no heat will occur, as the market remains open for USDC settlement until the data is finalized in the Daily Extract.

Historical data frames this 0% probability as a clear mispricing, given that July in Hong Kong consistently delivers highs around 31°C with average early-July temperatures near 29.3°C[1][7]. The average warmest day in July falls on 10 July with a high of 30.1°C, while the month typically warms to 31.4°C by the end, making any temperature range below 25°C the only truly improbable outcome[3]. A trader reading the current odds should recognise that the crowd has conflated the impossibility of a specific cold range with the impossibility of the event itself, ignoring that temperatures routinely exceed 30°C in this period.

Traders must monitor the Hong Kong Observatory’s scheduled release of the Daily Extract, which is the sole dependency for resolution, alongside any sudden tropical cyclone announcements that could suppress temperatures. Recent forecasts indicate temperatures dropping to 13°C this weekend before rising to 25°C on Sunday, suggesting volatile short-term shifts that could impact the 6 July reading if a weather system intervenes[6]. The catalyst to watch is the official publication of the Absolute Daily Max data, as the market cannot resolve until this figure is confirmed, and any delay in the Daily Extract will keep the conditional tokens active for USDC trading on Polygon.

Sources: 1 · 2 · 3 · 4 · 5

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 Kalshi UK, 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

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'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 Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.