Highest temperature in Hong Kong on July 10?

Platform comparison

Market context

Hong Kong faces a forecast of record-breaking heat in 2026, with the Hong Kong Observatory warning that summer temperatures will likely exceed normal levels and potentially rank among the top ten hottest years on record[2][4]. The market in question asks whether the highest temperature recorded on 10 July 2026 will fall into a specific range, yet the crowd-implied probability sits at 0% for a "YES" outcome, suggesting traders believe the event is virtually impossible under current conditions[1]. This stark divergence between the official weather outlook and market pricing is unusual, as sportsbook lines on similar heat contracts typically reflect the high probability of extreme temperatures during Hong Kong’s peak summer months[10].

Historical data frames this anomaly: July in Hong Kong routinely sees daily highs between 30°C and 34°C, with the average warmest day reaching 30.1°C[8]. Recent records show temperatures soaring past 34.6°C earlier this year, marking the hottest day so far in 2026[3]. If the 0% probability implies the target range is far above 35°C, traders may be misreading the scale, as "extremely hot" days (≥35°C) are rare but not impossible in a year predicted to be one of the hottest ever[2][7]. Analyst consensus on comparable contracts usually assigns a non-zero chance to such extremes when official forecasts signal record heat[4].

Traders should monitor the Hong Kong Observatory’s daily extract for the "Absolute Daily Max" on 10 July, as resolution depends entirely on this finalized data[1]. The upcoming week from 10–12 July is expected to see urban highs reach 34°C on Friday, with potential for further spikes if tropical cyclone activity intensifies[5]. Any official announcement confirming a day exceeding 35°C would directly challenge the current 0% pricing, especially given the UN’s raised alarm over the climate crisis driving this record heat[10]. The settlement window ends at 12:00 UTC on 10 July 2026, leaving little time for data correction 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 Best Prediction Markets UK, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Best Prediction Markets UK. 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.