Highest temperature in Hong Kong on August 2?

Platform comparison

Market context

Polymarket currently prices the Hong Kong maximum-temperature contract with **27°C** as the leading outcome at **34%**, and **28°C** close behind at **32%**, so the book is leaning towards a fairly tight peak rather than an extreme heat spike. On Polymarket, traders are buying and selling USDC-settled conditional tokens on Polygon, and the winning range will only pay out once the Hong Kong Observatory finalises the day’s **“Absolute Daily Max (deg. C)”** in its Daily Extract. [3]

For context, Hong Kong’s August climate is usually hot and humid, with daily maxima often clustering in the high-20s to low-30s Celsius, which makes the current 27–28°C-centred pricing look like a cautious read on a rainy or cloudier day rather than a broad heatwave. The market’s 0% yes probability on any single alternative outcome is best read as a live distribution across the listed temperature bins: on a day with strong convection or intense sunshine, the upper bins can reprice quickly, but the current order flow suggests traders are not leaning into a breakaway high. [1][4][5]

The main catalysts are the Hong Kong Observatory’s intraday readings, the local forecast updates, and whether showers or thunderstorms suppress the afternoon maximum; Hong Kong weather pages have already flagged unsettled August conditions, and recent reporting has noted the city has still been capable of very hot days above 34°C this year. Traders watching the contract need the Observatory’s final published extract, because that settlement file—not live app readings or third-party forecasts—determines the outcome once the data is posted. [8][9][13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on August 2? 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 PolyGram, 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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.