Highest temperature in Hong Kong on July 3?

Platform comparison

Market context

On 3 July 2026, Hong Kong will record its absolute daily maximum temperature, a single figure that determines whether the market settles on a high-heat range or a cooler one. The crowd currently assigns a 0% implied probability to the “YES” outcome, reflecting a consensus that extreme heat is unlikely. This stance aligns with recent patterns: July 2025 saw the city’s hottest month on record, with 31.8°C mean maximums and numerous hot days[8], yet daily peaks rarely breach 36°C. Historical data from the past 30 years shows July averages hovering near 31–32°C, with outliers above 35°C occurring infrequently[6]. The underdog here is the high-heat scenario; the favourite is a moderate peak, consistent with the 0% crowd-implied probability.

Traders should monitor the Hong Kong Observatory’s upcoming “Daily Extract” release, which finalises the absolute daily max for 3 July[2]. A key catalyst is the weather forecast for 2–4 July: light rain on 3 July (27–31°C) and heavy rain on 4 July suggest suppressed temperatures, reducing the chance of a record peak[9]. Recent news from the South China Morning Post confirms July 2025’s record-breaking heat, but also notes that daily extremes remain constrained by monsoon activity[8]. The value spot may lie in contrarian bets on a high-heat range if a sudden heatwave disrupts the forecast, though current dependencies favour the consensus. The implied probability of 0% suggests the market is pricing in near-certainty of a moderate outcome, leaving little room for error unless a surprise weather shift occurs.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on July 3? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

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 Who Will Win. 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 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 Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.