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 highest temperature in degrees Celsius. This market settles on the absolute daily maximum reported in the Observatory's official "Daily Extract" dataset, measured to one decimal place. The settlement window closes at noon UTC on that date, though resolution cannot occur until the Observatory publishes finalised data, typically within 24–48 hours of the observation period ending.

Hong Kong's June temperatures are historically stable within a narrow band. The 30-year mean maximum for mid-June sits around 31–32°C, with extreme highs rarely exceeding 35°C. The 0% crowd probability on Polymarket reflects either genuine uncertainty about which temperature bracket will resolve, or sparse liquidity in this niche weather market—a pattern common across weather derivatives where retail participation is thin. Kalshi and Smarkets, which cater to different geographic and regulatory bases, may show divergent implied probabilities if traders in those jurisdictions have stronger local weather forecasting resources. Decimal odds on Betfair would express any eventual movement differently than Polymarket's binary format, making direct comparison difficult without live order books.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any tropical cyclone alerts issued between now and June 2026, as these drive temperature volatility. The South China Sea monsoon transition in early June can suppress highs; conversely, high-pressure systems from the north occasionally push temperatures above the 33°C threshold. No scheduled major weather announcements typically occur in this window, making this market primarily dependent on real-time atmospheric conditions rather than policy or event catalysts.

Methodology

This page compares Highest temperature in Hong Kong on June 12? 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

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). Kalshi Alternative UK 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 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.

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.

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, Kalshi Alternative UK triggers a quick verification flow that finishes in minutes.