Highest temperature in Hong Kong on July 13?

Platform comparison

Market context

Hong Kong faces its peak summer heat on 13 July 2026, with the Hong Kong Observatory set to record the day’s absolute maximum temperature in degrees Celsius. The prediction market currently assigns a 0% implied probability to the “YES” outcome, suggesting the crowd believes the temperature will fall outside the specific range offered, despite July being historically the hottest month in the region with average highs near 31°C [6][7].

Historical data underscores the volatility of mid-July temperatures, which have frequently breached 33°C in recent years, including an exceptionally hot July 2024 where daily means reached 30.8°C [1]. The current 0% probability appears divergent from sportsbook lines that typically price extreme heat events more conservatively, and contrasts with analyst consensus that often anticipates temperatures in the 32–35°C bracket for this period. This divergence may reflect a specific range mismatch rather than a genuine belief that heat will be absent, as recent forecasts for July 2026 indicate daily highs ranging from 29°C to 34°C (84°F–94°F) [2].

Traders should monitor the Hong Kong Observatory’s upcoming “Daily Extract” publication, which finalises the “Absolute Daily Max” figure required for settlement [7]. The immediate catalyst is the weather pattern for 13 July, currently described as “Sunny Periods with A Few Showers” with a medium-low probability of significant rain [10]. Any sudden shift toward prolonged cloud cover or heavy rainfall before noon UTC could suppress temperatures below the market’s threshold, while sustained sunshine would likely push readings higher, potentially invalidating the current zero-probability stance.

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

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 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.