Highest temperature in Hong Kong on June 6?

Platform comparison

Active sub-markets

Market context

On 6 June 2026, the Hong Kong Observatory will record the day's highest temperature in degrees Celsius. This market settles to whichever temperature band contains that single daily maximum reading, with resolution contingent on the Observatory publishing its "Absolute Daily Max" figure in the Daily Extract dataset. The settlement window closes at noon UTC on that date, though actual resolution may lag publication by hours or days depending on the Observatory's data release schedule.

Hong Kong's June climate sits at the threshold between late spring and early summer, with historical daily maxima typically ranging from 28°C to 34°C during this period. The 0% crowd probability across major platforms—Polymarket, Kalshi, and Betfair all showing similar consensus—reflects the market's nascent stage rather than genuine uncertainty about whether a temperature will be recorded. Early-stage weather markets often display extreme probabilities simply because liquidity hasn't yet attracted traders willing to shade positions. Comparable June temperature ranges from prior years show sufficient variance that any single outcome band should carry meaningful probability mass once the market matures.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any tropical weather systems developing in the Western Pacific during May and early June 2026. Typhoon activity or unusual monsoon patterns could shift temperatures materially. Fee structures differ across venues: Kalshi charges flat 2% on resolution, whilst Polymarket and Betfair operate on percentage-of-stake models that reward larger positions. KYC requirements are strictest on Kalshi (US-focused), moderately enforced on Betfair, and lightest on Polymarket for non-US traders, affecting which platform offers the tightest spreads for this niche weather contract.

Methodology

We read Highest temperature in Hong Kong on June 6? 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 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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi Alternative UK 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.