Highest temperature in Hong Kong on July 17?

Platform comparison

Market context

Hong Kong’s highest temperature on 17 July 2026 will be determined by the Hong Kong Observatory’s official daily maximum reading, recorded in degrees Celsius to one decimal place. The market resolves only once the “Daily Extract” is published, meaning no outcome can be confirmed until the data is finalized. With the settlement window closing at 12:00 UTC on that date, traders are betting on a specific temperature range that has yet to be observed.

Historically, mid-July in Hong Kong sees peak temperatures between 31°C and 35°C, with the all-time July high reaching 36.1°C in 2018. The current 0% YES implied probability suggests the crowd believes the chosen range is implausible, possibly outside the typical summer band. Comparable cases from 2023 and 2024 show consistent highs near 33–34°C, reinforcing that extreme outliers above 36°C are rare but not impossible during humid, stagnant conditions.

Traders should monitor the Hong Kong Observatory’s daily release schedule and any sudden shifts in regional weather patterns, such as tropical cyclone activity or prolonged southerly flows that can elevate temperatures. A recent forecast from the Observatory’s July bulletin notes increased cloud cover and rain chances for mid-July, which could suppress peak temperatures [1]. No sportsbook lines exist for this event, leaving prediction markets as the sole venue for odds comparison, with analyst consensus yet to emerge given the data’s unreleased status.

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, 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. 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'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.