Highest temperature in Hong Kong on June 30?

Platform comparison

Market context

The real-world event hinges on the highest temperature Hong Kong Observatory records in degrees Celsius on 30 June 2026, a single data point that will determine the market outcome. For a power-user building a bot or conditional order, this is a straightforward fetch-and-resolve task: programmatically query the Observatory’s “Daily Extract” for the “Absolute Daily Max” once finalized, then compare it against the predefined temperature ranges to settle the position.

Historically, Hong Kong’s June maxima cluster between 29°C and 34°C, with the highest monthly mean maximum reaching 32.4°C in 2016[8]. Recent extremes include 33.7°C in early June 2026[5] and 34.6°C during the hottest “Mangzhong” on record[6], suggesting the 13% YES probability for a higher range is plausible but not guaranteed. A shift of just one degree can swing the outcome, making historical volatility a critical input for model calibration.

Traders must monitor the Observatory’s release schedule for the 30 June data, which depends on the finalisation of the Daily Extract and potential delays from weather disruptions like the nine-day downpour forecast[6]. The HKO’s warning of extreme heat and hail indicates active synoptic conditions that could push temperatures beyond the norm[5]. Programmatic approaches should include automated checks for data availability and error handling for missing extracts, ensuring the bot executes only when the official figure is confirmed.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on June 30? 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 Polymarket Bot UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Bot UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.