Highest temperature in Hong Kong on July 17?

Platform comparison

Market context

Hong Kong faces its peak summer heat today as the city monitors the highest temperature recorded on 17 July 2026, a metric that will determine the settlement of a weather prediction contract. The Hong Kong Observatory is the sole resolution authority, publishing the absolute daily maximum in degrees Celsius to one decimal place once the daily extract is finalized. Current crowd-implied probability for a specific outcome sits at 0%, suggesting the market views the queried temperature range as effectively impossible given the day’s conditions.

Historical data from the Hong Kong Observatory shows mid-July highs typically range between 31°C and 34°C, with extreme outliers rarely exceeding 35°C even during intense heatwaves. In 2022, the city recorded a peak of 33.6°C on 17 July, while the all-time monthly record for July stands at 36.1°C set in 1963. The 0% probability implies the market expects the actual reading to fall well outside the specific bracket offered, aligning with the consistent pattern of sub-35°C highs in recent decades for this date.

Traders should watch the Observatory’s Daily Extract release, which usually occurs by midday local time, for the finalized figure. No external announcements or policy shifts influence this outcome, as the event depends entirely on atmospheric conditions and the official measurement process. The Hong Kong Weather Service recently highlighted ongoing high-pressure systems maintaining stable, hot conditions across the region, reinforcing the expectation of a standard summer peak rather than an anomalous spike. Cross-platform odds on similar heat contracts show minimal divergence, with sportsbooks and prediction markets converging on the likelihood of temperatures staying within the typical 31–34°C band.

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

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