Highest temperature in Hong Kong on August 3?

Platform comparison

Market context

Hong Kong’s top temperature on 3 August is trading like a **low-to-mid 20s to upper-20s Celsius** call rather than a heat-breakout race, with the crowd currently assigning **0% to YES** on the market as framed. The consensus sits on the cooler end of the range, which makes the favourite the **27°C–28°C band** rather than any sharply higher outcome, and that positioning leaves the bigger upside in a contrarian warm-day spike if clouds thin earlier than expected.[2][5]

For context, August in Hong Kong is normally hot, humid, and rain-affected, with typical daily highs often around the high-20s to low-30s Celsius, so a sub-30°C print is plausible when showers and cloud cover cap the afternoon peak.[1][3][7] Recent reporting has also shown Hong Kong can still log very hot days when conditions align, with local outlets noting year-to-date highs in the mid-30s Celsius during heat episodes, which is the main tail-risk for anyone leaning too hard on the underdog cooler bands.[4][9][11]

The main catalysts are the Hong Kong Observatory’s forecast updates, the day’s rainfall and cloud cover, and the eventual “Absolute Daily Max” entry in the HKO Daily Extract, which is the settlement source and can only resolve once final data is published.[5] Traders should watch the timing of the Observatory’s short-range guidance and whether morning showers persist into the afternoon; persistent wet weather favours 27°C or 28°C, while a late clearing opens the value spot for higher bands such as 29°C or above.[2][10][19]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on August 3? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

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.

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 Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.