Highest temperature in Hong Kong on July 27?

Platform comparison

Market context

Hong Kong’s official high temperature for 27 July will be taken from the Hong Kong Observatory’s daily extract, and the market will settle only after that data is published. The crowd is currently pricing the contract at **0% YES**, which is unusual but not impossible in a weather market because the settlement is tied to an exact Celsius band rather than a broad range, so the full distribution matters more than the headline probability. [1]

For context, Hong Kong in late July is typically hot, humid and rainfall-prone, which can suppress the chance of an extreme daytime high but also leaves plenty of room for a mid-to-upper 20s or low-30s reading depending on cloud cover and storm timing. A recent Hong Kong July outlook from EaseWeather flagged heavy rainfall for the month, reinforcing that precipitation risk is a live variable for temperature outcomes rather than a simple heatwave bet. [2] Comparable Hong Kong temperature markets on nearby dates have shown the 32°C outcome leading with 41.5% implied probability, illustrating how quickly these contracts can concentrate around one band when the weather pattern is stable; by contrast, today’s 0% quote suggests a much flatter or less confident distribution on this specific date. [3]

Traders should watch the Hong Kong Observatory’s daily updates and any nowcasts around afternoon convection, because the peak temperature can be set by brief sun breaks, sea breeze effects, or a thunderstorm knocking the daily maximum lower. The key dependency is not a sportsbook-style line but the final official “Absolute Daily Max (deg. C)” entry, so any divergence between market price and analyst read-through will mainly reflect how participants model cloud, rain and timing risk rather than a separate published over/under line. [1][2]

Sources: 1 · 2 · 3

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 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.

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.