Highest temperature in Hong Kong on July 12?

Platform comparison

Market context

Hong Kong faces its peak summer heat on 12 July 2026, with the market betting on whether the Hong Kong Observatory will record a daily maximum temperature exceeding specific Celsius thresholds. The crowd-implied probability of a “YES” outcome sits at 0%, suggesting traders view an extreme heat spike as virtually impossible given current conditions. This stark pricing contrasts with sportsbook-style weather lines that often assign non-zero odds to record-breaking days in tropical zones, highlighting a divergence between prediction-market consensus and broader weather volatility models.

Historically, July is Hong Kong’s hottest month, averaging 89°F (31.7°C) highs, with 2024 setting a record when temperatures hit 34.8°C on 7 July [1][2]. Despite this precedent, the 0% probability implies traders believe 2026’s atmospheric conditions lack the necessary confluence of high-pressure systems and humidity to breach prior extremes. Comparable cases show that while record months occur, specific single-day spikes above 35°C remain rare, framing the current odds as a conservative read on seasonal norms rather than an outlier event.

Traders should monitor the Hong Kong Observatory’s upcoming “Daily Extract” for the finalized “Absolute Daily Max” figure, which settles the contract once published [8]. Key catalysts include real-time updates on tropical cyclone activity or sudden shifts in the Pacific high-pressure ridge, both known to amplify heat in the region. Recent forecasts for July 2026 indicate daily highs between 30–34°C (86–94°F), aligning with the market’s low-stakes pricing [3]. No immediate announcements suggest a deviation from these patterns, reinforcing the current consensus.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on July 12? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

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 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.