Highest temperature in Hong Kong on July 7?

Platform comparison

Market context

Hong Kong faces its annual peak heat window as traders assess the likelihood of record-breaking temperatures on 7 July 2026. The market currently assigns a 0% implied probability to any specific high-temperature range, reflecting extreme uncertainty or a lack of liquidity before the official data release. This contrasts sharply with sportsbook-style weather lines that often price July highs between 33°C and 35°C based on seasonal averages, while prediction-market analysts remain cautious given the settlement window closes just hours after the target date.

Historical records show July 2007 delivered the highest monthly mean maximum temperature of 32.9°C, with 1967, 2014, and 2016 also reaching 32.6°C [9]. Last year, July 2025 was confirmed as the city’s hottest month on record, featuring the most hot days and nights since 1884 [8]. These precedents suggest that while extreme heat is typical, the 0% crowd probability may signal either a technical pricing error or a genuine belief that the specific range offered is implausible relative to the Observatory’s typical daily maximums.

Traders should monitor the Hong Kong Observatory’s “Daily Extract” publication schedule, which finalises the “Absolute Daily Max (deg. C)” for settlement [4]. The data becomes available only after the 2026-07-07T12:00:00Z cutoff, creating a binary resolution dependency on official confirmation [6]. Recent climate reports note rising annual mean temperatures at the Observatory Headquarters since 1885, reinforcing the trend toward hotter summers [7]. No external announcements are expected; the sole catalyst is the Observatory’s automated data release, which will determine the market’s outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on July 7? 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 Best Prediction Markets UK. 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 Best Prediction Markets UK 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.