Highest temperature in Hong Kong on July 9?

Platform comparison

Market context

Hong Kong’s July 9 maximum temperature is now forecast at 32°C, a shift from the previous 31°C baseline observed in the last 24 hours as subtropical monsoon moisture intensified. This adjustment aligns with the market’s leading 32°C outcome, which currently holds a 35.5% implied probability, while the crowd-implied probability for any temperature exceeding 32°C remains at 0% YES. The Hong Kong Observatory’s seasonal forecast for July–September 2026 confirms normal-to-above-normal temperatures, driven by rising sea surface temperatures in the equatorial Pacific and an emerging El Niño event expected to peak in late summer [3].

Historically, Hong Kong’s July daily maxima cluster tightly between 31°C and 32°C, with the average high for July 2026 recorded at 89°F (31.7°C) [2]. The 32°C threshold has been breached only sporadically in recent years, typically during extreme heatwaves linked to strong El Niño conditions, which the current forecast suggests may develop by late summer [3]. Given this pattern, the 0% YES probability for temperatures above 32°C reflects a conservative market view that aligns with the seasonal outlook calling for normal-to-above-normal temperatures amid long-term warming trends [1].

Traders should monitor the Hong Kong Observatory’s daily weather updates, particularly the “Absolute Daily Max” data once finalized in the “Daily Extract” [6]. Key catalysts include the official release of the July 9 temperature reading, expected after 12:00 UTC on 9 July 2026, and any sudden shifts in monsoon intensity or typhoon activity, which could disrupt the forecast. Recent news from the Observatory highlights the ongoing rise in equatorial Pacific sea temperatures, a critical dependency for the El Niño development that may influence July temperatures [3]. No further announcements are scheduled, but real-time data updates will be available via the Observatory’s climate portal [7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Prediction Today. 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.

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