Pronóstico: Highest temperature in Hong Kong on July 4?

Platform comparison

Market context

On 4 July 2026, Hong Kong faces a sweltering day where the highest temperature recorded by the Hong Kong Observatory will determine the outcome of a Polymarket contract. The market currently prices the 31°C range at 59% probability, with 30°C trailing at 32%, while the 0% YES probability for the "highest" outcome reflects a misunderstanding of the conditional token structure rather than the weather itself. Traders on Polygon using USDC are trading shares that resolve to the specific temperature bracket once the "Absolute Daily Max" is finalized in the Daily Extract.

Historical July data frames this pricing, as Hong Kong typically reaches its peak average temperature of 30.9°C on 30 July, with July and August being the hottest months averaging 32°C [3][5]. Recent records show extreme volatility, with Sheung Shui hitting 39°C on a record-breaking July day, proving that 31°C is a plausible but not guaranteed ceiling [10]. The current 59% implied probability for 31°C aligns with the average high range of 86°F to 96°F forecast for July 2026, suggesting the market is betting on a standard hot day rather than an extreme anomaly [4].

Traders must monitor the Hong Kong Observatory's Daily Extract publication schedule, as the market cannot resolve until the data for 4 July is officially published [6]. The immediate catalyst is the heavy rain forecast for 04 July, which could suppress temperatures below the 31°C threshold if the downpour persists through the afternoon [7]. Additionally, urban heat island effects in urban areas may push temperatures to around 31°C despite the rain, while the New Territories could see slightly higher values [9]. The conditional tokens will only settle once the Observatory confirms the final "Absolute Daily Max" to one decimal place, making the timing of this data release the critical dependency for share settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Hong Kong on July 4? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Qué Es, which mirrors the Polymarket order book at 0% fees.

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

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'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 Polymarket Qué Es 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.