Highest temperature in Hong Kong on July 6?

Platform comparison

Market context

Hong Kong is set to experience its peak summer heat on 6 July 2026, with the Hong Kong Observatory tracking the absolute daily maximum temperature in degrees Celsius to one decimal place. The current prediction market implies a 0% chance that the temperature will hit 31°C, yet this contradicts the 37.5% probability priced on Lines.com for the same threshold, revealing a stark divergence between platforms.

Historical July data frames this discrepancy, as average highs in early July typically reach 30.4°C, with monthly means often climbing to normal or above-normal levels due to the current ENSO status [1][10]. The Hong Kong Observatory’s seasonal forecast explicitly projects normal to above-normal temperatures for July through September 2026, suggesting that a 31°C reading is climatologically plausible rather than improbable [1]. Traders should note that the 0% market implied probability appears to ignore these established seasonal trends and the 37.5% line on competing platforms [2].

Key catalysts include the finalisation of the “Daily Extract” data from the Hong Kong Observatory, which will confirm the absolute maximum once published [1]. A stagnant, humid overnight with light winds could push temperatures into the 27°C low range, potentially aiding a higher daytime peak [4]. Forecast updates for the week show mainly cloudy conditions with light rain patches, which may moderate extremes, yet the multi-model consensus system remains the primary dependency for accurate resolution [6][8]. The settlement window closes on 6 July 2026 at 12:00 UTC, requiring traders to monitor the official release closely.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on July 6? 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

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 Best Prediction Markets. 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.

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 Best Prediction Markets 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.