Highest temperature in Hong Kong on May 31?

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Market context

The Hong Kong Observatory will record the highest daily temperature on 31 May 2026, with settlement determined by the absolute daily maximum reading published in their Daily Extract climate data. The crowd currently assigns zero probability to this event occurring, suggesting either extreme confidence in a specific temperature range or insufficient liquidity driving the market to an edge case.

Hong Kong's May temperatures sit firmly in the pre-monsoon warm season, with historical daily maxima typically ranging between 28°C and 33°C. The Observatory's 30-year climate normals show May averages around 30–31°C, though individual days regularly exceed 32°C. The 0% implied probability indicates the market has collapsed into a single resolution bucket—likely the most probable range—leaving no meaningful odds on alternative outcomes. This pattern occurs when traders view one temperature band as overwhelmingly likely and avoid hedging positions across adjacent ranges.

Traders monitoring this market should track seasonal weather patterns as May 2026 approaches, particularly any signals from the Hong Kong Observatory's seasonal forecasts or broader Pacific climate indices. The Southwest Monsoon typically begins in late May, which can suppress temperatures slightly, though individual days before the full transition often remain hot and humid. Real-time weather data from late May will provide the clearest indicator of which temperature band warrants consideration; the current 0% reading reflects only pre-season positioning rather than any fundamental constraint on May temperatures in Hong Kong.

Methodology

This page reviews Highest temperature in Hong Kong on May 31? 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 Who Will Win 2026 — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Who Will Win 2026, 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?

Who Will Win 2026 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'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.

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, Who Will Win 2026 triggers a quick verification flow that finishes in minutes.