Highest temperature in Hong Kong on July 2?

Platform comparison

Market context

Hong Kong is bracing for July 2026, a month forecast to deliver normal to above-normal temperatures, with the Hong Kong Observatory warning that summer conditions could be hotter than average[1][4]. The market in question asks whether the highest temperature recorded on 2 July 2026 will fall within a specific range, yet the crowd-implied probability for a "YES" outcome sits at 0%, suggesting traders believe the threshold is unattainable under current conditions. This stark divergence from sportsbook lines, which often price similar heat events more generously, highlights a unique caution in the prediction market that contrasts with broader analyst consensus on Hong Kong’s warming trajectory.

Historical data frames this caution: July 2023 saw Hong Kong experience its hottest summer on record, with a mean temperature of 29.7°C, while May 2026 already recorded a peak of 34.6°C, the hottest day of the year so far[4][6][8]. Despite these precedents, the 0% probability implies traders expect the specific range to be either too high or misaligned with the Observatory’s "Absolute Daily Max" metric, which measures to one decimal place[1]. Unlike sportsbooks that may hedge on extreme heat, prediction markets here appear to penalise the contract for a perceived mismatch between the range and the likely 34–35°C highs forecast for early July[2].

Traders should monitor the Observatory’s upcoming "Daily Extract" for 2 July, which finalises the official temperature reading, and watch for any sudden shifts in the ENSO status that could alter July–September forecasts[1][5]. Recent news confirms Hong Kong hit 34.6°C on Friday, with hail warnings issued, underscoring volatile summer conditions that could push temperatures higher or lower depending on cloud cover and rainfall[8]. The settlement window ends 2026-07-02T12:00:00Z, meaning the market cannot resolve until the Observatory publishes the finalized data, a dependency that adds uncertainty to the 0% implied probability[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on July 2? 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

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 Best Prediction Markets 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.