Highest temperature in Hong Kong on June 24?

Platform comparison

Active sub-markets

Market context

The Hong Kong Observatory is forecasting above-normal temperatures for June 2026, with the city expected to reach its warmest top ten years on record. Historical data shows June 2025 hit an absolute maximum of 35.6°C, while recent extreme heat warnings in 2026 saw New Territories temperatures soar to 37°C. Given these precedents, the current crowd-implied probability of 0% for any specific temperature range appears misaligned with the seasonal trend, suggesting traders should scrutinise whether the market is underestimating the likelihood of record-breaking highs.

Key catalysts include the finalisation of the "Daily Extract" from the Hong Kong Observatory, which will publish the absolute daily maximum temperature once data is confirmed. Traders must monitor the Observatory’s seasonal forecast updates and any extreme heat warnings, as these directly influence the resolution source. Recent coverage from the South China Morning Post highlights Hong Kong’s hottest day of the year so far at 34.6°C, reinforcing the volatility in temperature records. On platforms like Polymarket versus Kalshi, divergence arises in decimal odds versus implied probability displays, fee structures, and KYC requirements, which may affect liquidity and pricing accuracy for this weather-specific market.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Hong Kong on June 24? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, 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 Alternative 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'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 Alternative?

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