Highest temperature in Hong Kong on August 4?

Platform comparison

Market context

Hong Kong’s high on 4 August will be judged on the Hong Kong Observatory’s final daily extract, and the market is currently pricing a **0%** chance of a YES in that specific band. That makes the favourite effectively *not* the market’s named outcome for now, so the consensus sits elsewhere, with the clear money concentrated in the low-30s rather than any one exact bucket. The key handicapper’s read is that, in late-summer Hong Kong, the top end is often determined as much by cloud, showers and sea-breeze timing as by the broader heat signal.

Recent market pricing shows the crowd leaning to **30°C** at **40%**, with **29°C** next at **34%**, which is a useful guide to where the consensus thinks the absolute maximum is most likely to land.[2] That shape implies traders are treating sub-30s and low-30s as the base case, while leaving less weight on a clean break higher. In comparable August conditions, Hong Kong often posts daily highs in the upper-20s to low-30s rather than extreme readings, so the value conversation is usually about whether a warm, humid day reaches one band above the consensus rather than chasing the outright hottest outcome.[1][7]

For catalysts, the main watchpoint is the Hong Kong Observatory’s daily readings and later publication of the final “Daily Extract”, because this market cannot settle until that data is posted.[3][15] Short-term updates on regional readings and any heavy rain or thunderstorm signals matter because they can cap the day’s maximum even when the overall summer pattern is hot.[6][15] On the broader weather side, the Observatory’s seasonal outlook and local media coverage have pointed to elevated heat risk in 2026, but that mainly supports the *underdog* argument for a higher band if the midday sky clears rather than guaranteeing it.[19][20]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on August 4? 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.

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.