Highest temperature in Hong Kong on June 22?

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Market context

The highest temperature recorded in Hong Kong on 22 June 2026 will determine the outcome of this prediction market, with the Hong Kong Observatory serving as the definitive resolution source. Today, Polymarket prices the contract for a 33°C hit at 0% YES, reflecting near-total market consensus that this specific threshold is improbable. The on-chain mechanics operate via USDC on the Polygon network, where conditional tokens settle automatically once the Observatory publishes its finalised "Daily Extract" data.

Historical June data frames this low probability clearly: the highest monthly mean maximum for June in Hong Kong is 32.4°C, recorded in 2016, with 2015 following closely at 32.3°C[3]. While extreme heatwaves have pushed daily peaks to 36.1°C recently, breaking the 1963 record, these spikes typically occur on days distinct from the 22nd, and the average June high sits around 32.2°C (90°F)[4][5]. The 0% price aligns with the statistical reality that hitting exactly 33°C is a narrow outlier compared to the broader distribution of June temperatures.

Traders must monitor the Hong Kong Observatory’s extreme heat warnings and scheduled weather bulletins, as these announcements often precede the peak temperature days[7]. The resolution depends entirely on the Observatory finalising the "Absolute Daily Max" in its official daily extract, a process that can take several days after the event date[1]. Recent reports of a heatwave pushing temperatures past 34°C suggest volatility, but the specific 33°C target remains statistically unlikely given the prevailing climate patterns for late June[4][9].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on June 22? 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 Kalshi 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 Kalshi 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?

Kalshi 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.

What does it cost to trade on Kalshi UK?

Zero. Kalshi 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 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?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK triggers a quick verification flow that finishes in minutes.