Highest temperature in Hong Kong on July 2?

Platform comparison

Market context

On 2 July 2026, Hong Kong faces its peak summer heat, with the Hong Kong Observatory set to record the absolute daily maximum temperature in degrees Celsius. The current crowd-implied probability for the market is 0% YES, suggesting the consensus heavily doubts any specific high-temperature outcome will be met, yet Polymarket data shows 32°C as the frontrunner at 45% and 33°C at 28%[1]. This divergence indicates the crowd may be mispricing the likelihood of extreme heat, creating a potential value spot for contrarian traders who recognise that July is historically Hong Kong’s hottest month.

Historical averages place daytime maximums at 31°C, but long-term climate trends show a significant increase in July temperatures due to global warming[2][3]. The Hong Kong Observatory’s seasonal forecast for July–September 2026 predicts normal to above-normal temperatures, reinforcing the favourite status of the 32°C–33°C range[3]. Traders should watch for tropical storm activity, which affects roughly 2.2 days in July and can temporarily suppress peak heat[2]. Recent regional forecasts indicate temperatures ranging from 25°C to 29°C through 9 July, but the daily max could spike higher under clear skies[7]. The key dependency is the finalisation of the “Daily Extract” data from the Observatory, which will confirm the settlement value once published[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win, which mirrors the Polymarket order book directly.

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

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.

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.

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 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.