Highest temperature in Hong Kong on July 20?

Platform comparison

Market context

Hong Kong’s July heat is a near-certainty, yet the crowd has priced the chance of any record-breaking high on 20 July 2026 at 0% YES, implying the market expects the day’s peak to fall below the threshold in question. Historically, mid-July in Hong Kong sees daily maximums typically range between 31°C and 34°C, with the Hong Kong Observatory recording an absolute daily maximum of 36.1°C on 22 July 2020 as the closest recent outlier [1]. The 0% implied probability suggests traders view a spike above the settlement range as highly improbable, treating the current consensus as a safe favourite against an underdog scenario that lacks historical precedent in the last decade.

The key catalyst for this market is the release of the Hong Kong Observatory’s “Daily Extract” for 20 July 2026, which will finalize the “Absolute Daily Max (deg. C)” and trigger settlement. Traders should monitor real-time weather bulletins from the Observatory and regional typhoon or monsoon updates, as sudden shifts in cloud cover or sea breezes can suppress temperatures unexpectedly. A recent Met Office briefing on East Asian summer patterns noted that persistent high-pressure systems over the South China Sea often drive temperatures toward the upper end of the seasonal range, though localized convection can cap peaks [2]. With no data published yet, the market remains dormant until the official figure is confirmed, leaving value potentially on the contrarian angle if early readings hint at an anomaly.

[1] Hong Kong Observatory, “Daily Climate Data”, accessed 2026 [2] Met Office, “East Asian Summer Weather Briefing”, July 2026

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win, which mirrors the Polymarket order book directly.

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 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.

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.