Highest temperature in Hong Kong on June 12?

Platform comparison

Active sub-markets

Market context

On 12 June 2026, the Hong Kong Observatory will record the day's maximum temperature in degrees Celsius. This market resolves to whichever temperature band contains that single daily high, with settlement contingent on the Observatory's official publication in its Daily Extract dataset. The 0% crowd probability suggests either extreme confidence in a specific range or minimal trading activity; across Polymarket, Kalshi, Betfair and Smarkets, liquidity patterns on niche weather markets often reflect regional interest rather than true price discovery, and this Hong Kong–specific event may see material divergence between platforms' implied probabilities once volume accumulates.

Hong Kong's June climate is consistently warm and humid. Historical data from the Observatory shows June daily maxima typically range between 29–33°C, with extreme highs above 34°C occurring in roughly 5–10% of years during the month. The 2023 and 2024 June records provide useful anchors: neither month saw temperatures exceed 35°C, though individual days regularly hit 32–33°C. Traders should note that the Observatory's decimal-precision reporting (to one decimal place) means settlement hinges on exact measurement, not rounded figures.

The key catalyst is the onset of the southwest monsoon and any early tropical systems approaching the South China Sea in early June 2026. The Hong Kong Meteorological Society publishes seasonal outlooks typically in May; any forecast for above-normal temperatures or typhoon activity would shift market expectations. Settlement timing is strict—the market closes at 12:00 UTC on 12 June, but the Observatory may take 1–2 weeks to finalise and publish the Daily Extract, creating a known resolution lag that traders on Kalshi's near-term contracts or Smarkets' cash-out features may price differently than on Polymarket's standard settlement model.

Methodology

We read Highest temperature in Hong Kong on June 12? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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 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.

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.

Do I need to KYC for this market?

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

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.