Highest temperature in Hong Kong on July 8?

Platform comparison

Market context

The contract on Polymarket prices the chance of Hong Kong hitting a specific high-temperature range on 8 July 2026 at 0% YES, implying the market believes the event is virtually impossible under current conditions. This on-chain position, settled in USDC on Polygon via conditional tokens, reflects a stark disconnect between the crowd’s view and the seasonal reality expected for mid-summer in the city.

Historically, Hong Kong’s early July days see average highs near 30.4°C, with daily minimums most frequently landing in the 26–28°C range, while the Hong Kong Observatory forecasts normal to above-normal temperatures for July–September 2026 due to El Niño influences[1][3]. The 0% price suggests traders are either misreading the climatology or betting on an extreme cooling anomaly that contradicts the Observatory’s explicit seasonal outlook, which also notes a likely 4–7 typhoons but confirms hotter-than-average conditions overall[2].

Traders should monitor the Observatory’s daily extract updates for the “Absolute Daily Max (deg. C)” once finalized, as the market cannot resolve until this data is published[1]. Key catalysts include any sudden typhoon landings within 500km of Hong Kong, which could suppress temperatures, and the official release of the July 2026 climate summary, expected to confirm whether the above-normal trend holds[2]. The dependency on the Observatory’s finalised daily extract remains the critical settlement trigger, with no resolution possible before that publication.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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.

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.

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.