Highest temperature in Hong Kong on June 23?

Platform comparison

Active sub-markets

Market context

The real-world event hinges on whether Hong Kong Observatory records a peak temperature on 23 June 2026 that falls into a specific Celsius range, with the current crowd-implied probability of 0% suggesting traders expect the outcome to be highly unlikely or the range misaligned with forecasts. Historical data frames this probability: June in Hong Kong typically sees average highs near 30°C, though recent extremes have pushed past 34.6°C, as recorded on the hottest day of the year so far in 2026[7]. Seasonal forecasts for June–August 2026 indicate above-normal temperatures are expected, with daily highs potentially ranging between 30°C and 37°C depending on local conditions in the New Territories[1][5]. This context suggests the 0% probability may reflect a mismatch between the market’s resolution range and the likely temperature band rather than an absolute absence of heat.

Traders should monitor official announcements from the Hong Kong Observatory regarding extreme heat warnings and the finalisation of the “Daily Extract” data for 23 June, as the market cannot resolve until this information is published[3]. Recent news highlights the Observatory’s warning of extreme heat with temperatures in the New Territories expected to hit 37°C, underscoring the volatility of summer conditions[5]. Additionally, the onset of the tropical cyclone season, likely starting in June or later, could influence temperature patterns and must be tracked as a key dependency[3]. From a regulatory standpoint, German GlüStV implications and US CFTC reach affect market accessibility, particularly for platforms offering “no-KYC up to $1,500”, which allows traders to participate without identity verification for smaller stakes, enhancing liquidity in niche weather markets like this one.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on June 23? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Tax 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.

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 it cost to trade on Polymarket Tax UK?

Zero. Polymarket Tax 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, Polymarket Tax UK triggers a quick verification flow that finishes in minutes.