Highest temperature in Hong Kong on July 17?

Platform comparison

Market context

Hong Kong’s highest temperature on 17 July 2026 hinges on whether mid-summer heatwaves, often driven by the subtropical ridge, push readings above 34°C. The crowd currently assigns a 0% implied probability to the YES outcome, suggesting the consensus expects temperatures to stay within lower bands, likely under 33°C. Historically, July in Hong Kong sees average daily maxima near 33.5°C, with extreme peaks exceeding 35°C occurring only during intense heat events linked to weak monsoon flow and clear skies. The last time the city recorded a daily maximum above 35°C in July was in 2022, when a prolonged heatwave pushed temperatures to 35.3°C, according to the Hong Kong Observatory’s climate summary.

Traders should monitor the Hong Kong Observatory’s daily weather forecasts issued each morning, particularly any updates on the subtropical ridge’s position and monsoon activity. A key catalyst is the release of the 7-day forecast, which often signals incoming heatwaves or cooling showers. Recent climate reports from the Observatory note that July 2025 experienced above-average temperatures due to a persistent high-pressure system, setting a precedent for similar conditions in 2026 if atmospheric patterns align. Contrarian value may lie in betting on higher temperature ranges if the ridge strengthens unexpectedly, as current pricing appears to underweight the risk of an extreme heat day.

Methodology

We track Highest temperature in Hong Kong on July 17? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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'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.

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 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.