Highest temperature in Hong Kong on June 25?

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Market context

Hong Kong is currently bracing for a prolonged nine-day wet spell that will suppress temperatures, directly challenging the crowd-implied 0% probability that any heat range above the baseline will hit on 25 June 2026. Historical data frames this as a clear underdog scenario: the highest monthly mean maximum for June in the past 30 years sits at 32.4°C (recorded in 2016), while recent days have already seen peaks of 34.6°C and 35.6°C before the rain arrived[3][8]. The consensus is firmly on the cooling trough, yet the value spot lies in the contrarian angle that the initial heatwave might leave residual warmth before the trough fully bites, especially if the rain delays its peak on Sunday.

Traders must monitor the Hong Kong Observatory’s specific forecast for the low-pressure trough lingering over southern China, which is predicted to bring heavy showers peaking on Sunday and Monday, dropping temperatures to a cooler 26–30°C range[2]. The immediate catalyst is the UV Index forecast for today, which remains very high at 10, indicating that the heat is still active before the downpour begins[10]. While short-range models for the nearby 23 June date converge on 32–33°C, the active weather system for the 25 June window suggests a significant shift toward the lower end of the scale, making the 0% YES probability a logical but potentially fragile consensus if the rain onset lags[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), 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

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?

On Who Will Win, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Who Will Win is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 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.