Highest temperature in Hong Kong on July 12?

Platform comparison

Market context

Hong Kong is currently experiencing a cool, rainy spell with urban highs capped at 34°C, a sharp deviation from the typical July heatwave that usually pushes temperatures toward 32°C to 34°C or higher. The crowd-implied 0% probability for any specific high-temperature range on 12 July 2026 reflects this immediate meteorological reality, where rain and wind are suppressing peak heat rather than amplifying it.

Historical July data for Hong Kong shows average highs of 31.7°C (89°F), with daily peaks frequently reaching 33°C to 35°C under normal to above-normal temperature conditions forecast for July–September 2026[3]. However, the current cool pattern—evidenced by a recent cold weather warning dropping temperatures to around 12°C and forecasts of frequent rain through 19 July[2][8]—creates a significant divergence from the seasonal norm. This anomaly explains the zero probability assigned by traders, as the immediate weather system contradicts the typical high-temperature baseline seen in comparable years.

Traders should monitor the Hong Kong Observatory’s daily extract for the “Absolute Daily Max” once finalized, as settlement depends entirely on this official publication[1]. The key catalyst is the persistence of the rainy, windy system forecast to continue through the weekend, which will likely keep 12 July’s peak well below the 34°C threshold seen on 10–12 July in other urban areas[10]. Any sudden shift in the ENSO status or multi-model consensus forecast could alter the temperature trajectory, but current guidance points to normal to above-normal rainfall rather than extreme heat[3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on July 12? 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

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 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.

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 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.