Highest temperature in Hong Kong on July 1?

Platform comparison

Market context

On 1 July 2026, the Hong Kong Observatory will record the absolute daily maximum temperature in degrees Celsius, a figure that determines the resolution of a prediction market where the crowd currently assigns zero per cent probability to any specific outcome. This real-world event hinges on whether the day breaks the typical July heat pattern, which historically sees Hong Kong’s hottest month with average highs near 32°C and peaks occasionally exceeding 34°C.

Historical data frames this zero per cent implied probability as a stark underdog position, given that July 2007 recorded a monthly mean maximum of 32.9°C, while July 2018 saw a mean max of 31.8°C, and even the rain-soaked July 2022 dipped to just 25.4°C on 1 July due to heavy precipitation[3][5]. The consensus leans heavily toward cooler, rain-affected conditions, yet value may sit contrarianly on the possibility of a dry, high-pressure day pushing temperatures toward the upper 30s, especially as recent forecasts for July 2026 suggest daily highs ranging from 85°F to 93°F (approximately 29.4°C to 33.9°C)[4].

Traders should monitor the Hong Kong Observatory’s Daily Extract releases, which finalise the Absolute Daily Max only after data is published, and watch for any sudden shifts in monsoon activity or tropical cyclone warnings that could suppress temperatures[7]. A recent report by the South China Morning Post noted that July 2023 was the city’s hottest month on record, with the highest number of hot days and nights since 1884, underscoring the volatility of seasonal extremes[8]. The settlement window closes on 1 July 2026 at 12:00 UTC, meaning the market remains unresolved until the Observatory confirms the figure, leaving room for late-breaking weather anomalies to alter the expected outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on July 1? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.