Highest temperature in Hong Kong on July 8?

Platform comparison

Market context

On 8 July 2026, Hong Kong will face its peak summer heat as the Hong Kong Observatory records the day’s highest temperature in degrees Celsius, measured to one decimal point. This real-world event determines the resolution of a prediction market where the crowd currently implies a 0% chance of a “YES” outcome, suggesting near-total consensus that the temperature will fall outside the specified range.

Historical data frames this probability starkly: July in Hong Kong has routinely seen extreme highs, with Sheung Shui reaching 39.0°C in July 2022—the highest since the station opened in 2004[5], and 39°C recorded again in recent sweltering conditions[4]. The city’s hottest July months on average exceed 32°C[2], while 2026 forecasts predict daily highs between 86°F and 94°F (30°C–34°C)[6]. Given this track record, a 0% implied probability appears to diverge sharply from analyst consensus on typical July extremes, raising questions about whether the market range is misaligned with historical norms.

Traders should monitor the Hong Kong Observatory’s upcoming “Daily Extract” publication, which finalises the absolute daily maximum temperature once data is confirmed[3]. Key catalysts include the subtropical ridge’s influence, which has driven exceptionally hot July conditions in recent years, pushing average temperatures to 29.9°C[9]. No immediate weather announcements are scheduled, but the Observatory’s climate change reports note a 0.35°C per decade warming trend since 1996[8], reinforcing the likelihood of record-breaking highs. The settlement window closes on 8 July 2026 at 12:00 UTC, after which the official figure will be released.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on July 8? 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'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.

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.

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.