Highest temperature in Hong Kong on July 13?

Platform comparison

Market context

Hong Kong is set to record its highest temperature for 13 July 2026, with the Hong Kong Observatory’s “Absolute Daily Max” serving as the definitive settlement metric. Today, Polymarket prices the contract at 0% YES for any outcome outside the leading ranges, reflecting a market that has already concentrated liquidity on specific Celsius bands. On-chain, traders are using USDC on Polygon to buy conditional tokens, where correct shares redeem at $1 each while incorrect ones expire worthless.

Historical July climatology in Hong Kong shows average maxima around 31–32°C, with the current leading outcome priced at 32°C (47%) followed closely by 33°C (42%) [1]. This aligns with long-term records where July is the hottest month, averaging 89°F (31.7°C) highs, though extreme days have breached 35°C in past years [3][7]. The 0% probability on non-leading ranges suggests the crowd views deviations beyond 31–34°C as statistically improbable, consistent with the Observatory’s 1885–2019 ranking where the highest monthly maximum reached 35.7°C [2].

Traders should monitor the Observatory’s daily extract releases, as settlement depends entirely on the finalized “Absolute Daily Max (deg. C)” once published [1]. Recent news confirms July 2026 has already broken 11 heat-related records, with the month becoming Hong Kong’s hottest ever [4]. The key dependency is the official data drop in the Daily Extract; until this is finalized, the market cannot resolve, making the publication schedule the primary catalyst for price movement.

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.

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.

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