Highest temperature in Hong Kong on June 17?

Platform comparison

Active sub-markets

Market context

On 17 June 2026, the Hong Kong Observatory will record the day's highest temperature in degrees Celsius. This market settles on that single reading, published in the Observatory's Daily Extract once the date has passed and data finalised. The settlement window closes at 12:00 UTC on that date, though resolution cannot occur until the Observatory publishes its official record—typically within 24–48 hours of the observation period ending.

Hong Kong's June temperatures cluster tightly around historical norms. The Observatory's records show daily maxima in mid-June typically range from 31–33°C, with occasional excursions to 34–35°C during early heat waves. The 0% crowd probability across platforms suggests traders are either awaiting range definitions or treating this as a placeholder market pending clarification of the exact temperature bands offered. Kalshi and Polymarket often diverge on weather contracts: Kalshi's binary structure forces sharper probability calibration, whilst Polymarket's categorical ranges can leave lower-probability buckets underpriced if the interface obscures tail outcomes. Betfair and Smarkets typically offer tighter decimal-odds spreads on established weather markets but may show wider gaps on niche regional settlements like Hong Kong Observatory data.

Traders should monitor the Hong Kong Meteorological Society's seasonal forecasts and any tropical cyclone activity in the South China Sea during early June 2026, as systems tracking toward the region can suppress daytime highs significantly. The Observatory publishes 10-day outlooks fortnightly; the June forecast issued in late May will be the most actionable catalyst for repricing. KYC requirements vary sharply: Kalshi requires full US-style verification, whilst Polymarket operates with lighter onboarding in most jurisdictions, affecting liquidity distribution across platforms for this specific contract.

Methodology

This page compares Highest temperature in Hong Kong on June 17? 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 Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi Alternative 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 Alternative 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'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 Kalshi Alternative UK?

Zero. Kalshi Alternative 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.