Highest temperature in Hong Kong on June 30?

Platform comparison

Market context

On 30 June 2026, Hong Kong will face its peak daily heat as the Hong Kong Observatory records the absolute maximum temperature for the day, a critical metric for subtropical summer monsoon regimes. The crowd-implied probability sits at 96% YES for the favoured outcome, reflecting strong consensus that temperatures will not breach the upper threshold of the resolution range. This leans heavily on the favourite, with the underdog (a lower peak) holding minimal value in current pricing.

Historically, late June in Hong Kong sees average daily maxima in the low-to-mid 30s Celsius, with 32°C being a plausible and recurring peak. Recent data from the Hong Kong Observatory confirms daytime highs of 27–31°C for mid-June, aligning with the market’s leading outcomes of 30°C and 31°C [2]. Long-term guidance indicates above-normal temperatures for June–August, bolstering the cluster near the upper end of the 28–32°C range, while model consensus shows limited risk of extremes above 32°C absent major atmospheric shifts [2].

Traders must monitor the Hong Kong Observatory’s daily extract for finalized “Absolute Daily Max” data, as resolution hinges on this official publication. Recent warnings of extreme heat, with temperatures exceeding 35°C in early June, signal heightened volatility and potential contrarian value if the monsoon intensifies unexpectedly [5]. The settlement window closes 2026-06-30T12:00:00Z, so any delay in data finalization could impact trading liquidity, making the dependency on the Observatory’s timetable a key catalyst to watch [6].

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 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.