Highest temperature in Hong Kong on July 9?

Platform comparison

Market context

The real-world event at hand is the peak daily temperature Hong Kong will record on 9 July 2026, measured in degrees Celsius by the Hong Kong Observatory. Current crowd-implied probability sits at 0% for the "YES" outcome, suggesting the consensus expects the temperature to fall outside the specific range being traded. This stark pricing implies the market views the target range as highly unlikely, perhaps an underdog scenario where the odds are too short for value.

Historically, Hong Kong’s July temperatures exhibit a significant long-term increasing trend, with the chance of normal to above-normal heat generally higher under climate warming [1]. Recent data shows daily highs in July 2026 ranging from 85°F to 95°F (approximately 29°C to 35°C), with an average high of 89°F (31.7°C) [2]. The absolute maximum recorded so far this year was 35.4°C on 30 May [9], while the highest temperature in the past 15 days reached 91.9°F (33.3°C) on 24 June [6]. Given this upward trajectory, a contrarian angle might question whether the 0% pricing is too dismissive of an above-normal heat spike, potentially creating a value spot if the range is slightly conservative.

Traders should monitor the Hong Kong Observatory’s "Daily Extract" for finalised data, as the market cannot resolve until this official publication [9]. Key catalysts include the latest ENSO status and climate model forecasts, which currently project normal to above-normal temperatures for July–September 2026 [1]. Additionally, watch for any sudden shifts in local weather patterns, such as the drop to 13°C expected this weekend after recent highs [4], which could signal volatility. The resolution depends entirely on the "Absolute Daily Max (deg. C)" once finalized, making the Observatory’s schedule the primary dependency for settlement [9].

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

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 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.