Highest temperature in Hong Kong on July 23?

Platform comparison

Market context

Hong Kong’s **highest temperature** on 23 July is being priced with **34°C** as the favourite at about **46% implied probability**, while **33°C** is the main underdog at roughly **36%**. That puts the consensus in a fairly tight late-30s-to-mid-30s band, with the market currently leaning towards a normal hot-season reading rather than an extreme spike. [1]

Historically, July in Hong Kong is already the hottest part of the year, with average highs around **32°C** and frequent rain or storms, which can cap the day’s maximum even when humidity is oppressive. [2] For a handicapper, that means the favourite is the straightforward “near-climatology” call, while the value question sits on whether traders are overrating a clean, sunlit afternoon and underrating cloud, showers, or a passing thunderstorm that can leave the day topping out one notch lower. With the current pricing, **34°C** looks like the consensus favourite, but **33°C** is the more obvious contrarian angle if convective weather develops. [1][2]

The key catalyst is the Hong Kong Observatory’s official daily extract, because this market settles on the Observatory’s **Absolute Daily Max (deg. C)** once the 23 July data is published and finalised. [1] Traders should watch the timing of the daily extract release, any late-day weather shifts, and whether showers or thunderstorms interrupt heating during the afternoon; those are the main dependencies that can move the settlement outcome between adjacent temperature bands. [2]

Sources: 1 · 2

Methodology

We track Highest temperature in Hong Kong on July 23? 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

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

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 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.