Highest temperature in Hong Kong on June 4?

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Market context

On 4 June 2026, the Hong Kong Observatory will record a daily maximum temperature in Celsius, and this market resolves to whichever temperature band contains that single data point. The Observatory publishes absolute daily maxima to one decimal place in its Daily Extract records, accessible via the Climate Information Services portal. Settlement occurs at 12:00 UTC on the resolution date, though the Observatory typically finalises daily temperature data within hours of midnight local time (UTC+8).

Hong Kong's June temperatures cluster reliably between 28–32°C as the territory transitions into early summer monsoon season. Historical data from the Observatory shows that daily maxima in early June rarely exceed 33°C or fall below 27°C; the 1961–2023 mean for 4 June specifically sits near 29.5°C. Traders evaluating this market programmatically should note that the 0% crowd probability reflects either extreme confidence in a narrow range or sparse liquidity. Comparable early-June markets in prior years have typically seen the highest temperature fall within the 29–31°C band, making outlier ranges (sub-27°C or above-34°C) statistically improbable unless a tropical cyclone or unusual weather system affects the region.

Catalysts to monitor include the China Meteorological Administration's seasonal forecasts and any tropical cyclone alerts issued by the Observatory in late May 2026. The Southwest Monsoon onset typically occurs by early June, which can suppress temperatures or trigger heavy rainfall; conversely, a high-pressure system could push readings toward 32–33°C. Automated resolution workflows should account for the Observatory's publication schedule—data availability may lag by 24–48 hours if quality checks are required—and traders using conditional orders should set triggers based on the official Daily Extract release rather than preliminary station reports.

Methodology

This page reviews Highest temperature in Hong Kong on June 4? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Bot UK — the application we operate, where you trade directly against 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?

On Polymarket Bot UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Bot UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 it cost to trade on Polymarket Bot UK?

Zero. Polymarket Bot UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.