Highest temperature in Hong Kong on July 11?

Platform comparison

Market context

Hong Kong is entering its peak summer heatwave, with July 2026 already breaking multiple temperature records as the city experiences its hottest month on record. The Hong Kong Observatory confirmed that July saw an average monthly temperature of 30.3°C, shattering 11 historical benchmarks and establishing a new baseline for extreme heat in the region[1]. This context frames the current market where the crowd-implied probability sits at 0% YES, suggesting traders believe the highest temperature on 11 July will fall outside the specific range offered, despite the city’s recent record-breaking thermal performance.

Historically, July in Hong Kong consistently delivers the year’s highest temperatures, with average highs reaching 89°F (31.7°C) and record daily maximums frequently exceeding 34°C during heatwaves[2][6]. The exceptionally hot July of 2024 saw daily mean temperatures hit 30.8°C, with the 6th July recording the highest daily minimum ever observed at 29.2°C[2]. Given this trajectory, the 0% probability appears contrarian; value likely sits on the side betting the temperature will hit the upper end of the forecast range, as current models predict daily highs between 86°F and 94°F (30–34.4°C) for mid-July 2026[3].

Traders should monitor the Hong Kong Observatory’s daily extract for the “Absolute Daily Max” figure, which finalises the settlement data once published[8]. The primary catalyst is the real-time weather progression through 11 July, with no scheduled announcements expected beyond routine meteorological updates. Recent reports highlight that the scorching conditions have persisted throughout the month, reinforcing the likelihood of another record-breaking day[1]. The dependency remains strictly on the Observatory’s finalized data, meaning the market cannot resolve until the official “Daily Extract” is released, creating a clear timeline for settlement confirmation.

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 Who Will Win. 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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 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.