Highest temperature in Hong Kong on August 3?

Platform comparison

Market context

Polymarket is pricing this Hong Kong temperature contract at **0% YES**, so a trader buying shares now is paying almost nothing for the possibility that the Hong Kong Observatory’s verified daily maximum lands in the specified range and resolves on-chain in USDC via conditional tokens on Polygon. The market settles on the Observatory’s final “Absolute Daily Max (deg. C)” for 3 August 2026, not on a private forecast or a single midday reading, and the exchange’s own page currently shows the crowd clustered around the low-to-mid 20s/upper 20s outcomes rather than any extreme heat case.[2][8]

The historical frame is straightforward: Hong Kong in August usually sits in a hot, humid range, but the maximum can move sharply with cloud, rain bands, or typhoon-related disruption. Public climate summaries put typical August temperatures around the high 20s to low 30s Celsius, and recent local reporting has shown how quickly the Observatory can print very warm days, including 34–36°C readings during this summer’s hottest spells.[1][10][13][15] Against that backdrop, a 0% implied price is best read as the market treating the target outcome as highly unlikely relative to the broader seasonal norm, not as impossible.

For traders, the key catalysts are the Observatory’s official forecasts, tropical weather warnings, and any late shift in cloud cover or rainfall before the noon settlement window closes. The market description notes that revisions after initial publication do not count for resolution, so the relevant move is the first finalised Observatory daily extract, not later corrections.[2] The most useful dependency is whether showers or an approaching tropical system cap daytime heating; if the forecast turns sunnier and more stagnant, the distribution can move quickly even on the last trading session.[2][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on August 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 PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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