Highest temperature in Hong Kong on July 3?

Platform comparison

Market context

Hong Kong is bracing for July 2026 temperatures that seasonal guidance from the Hong Kong Observatory flags as normal-to-above-normal, driven by a developing El Niño event and long-term warming trends[5]. The current crowd-implied probability of 0% for the market outcome is starkly at odds with real-time market data, where 31°C holds a 48% chance and 30°C sits at 36%, suggesting traders are pricing in a hot day rather than dismissing the event entirely[1]. Historical patterns confirm July and August are typically Hong Kong’s hottest months, with average highs around 32°C and daily ranges frequently hitting 28–32°C, making a 31°C maximum well within the norm for this period[4].

Traders should monitor the Hong Kong Observatory’s 9-day forecast updates, which currently predict a temp range of 27–31°C with squally showers and thunderstorms later in the day[6]. The immediate catalyst is the intensification of a tropical cyclone over the South China Sea, expected to move toward Hainan Island and bring heavy, squally showers to southern China, potentially suppressing peak temperatures despite the underlying heat trend[6]. Additionally, the subsiding air from Tropical Cyclone Bavi in the western North Pacific, forecast to move east of Taiwan later next week, is expected to bring very hot weather to southern China, a key variable that could push temperatures above the current 31°C ceiling if the system’s timing aligns with the settlement window[6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on July 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 Prediction Today, 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

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 Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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

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.