Highest temperature in Hong Kong on June 10?

Platform comparison

Active sub-markets

Market context

On 10 June 2026, the Hong Kong Observatory will record the day's maximum temperature in degrees Celsius. This market settles on that single official reading, with resolution delayed until the Observatory publishes its "Daily Extract" data—typically available within days of the observation date. The settlement window closes at midday UTC on the resolution date itself, creating a narrow window for final trading once preliminary forecasts emerge.

Hong Kong's June climate sits at the threshold of the southwest monsoon season. Historical data from the Observatory shows daily maxima in early June typically range between 28–32°C, though heat waves can push readings above 34°C. The 0% crowd probability currently implied across major platforms suggests traders expect the market's temperature brackets to exclude the actual observed value, a common occurrence when resolution categories are poorly calibrated to seasonal norms. Kalshi and Polymarket both list this market, though their decimal-odds displays and fee structures (Kalshi's 2% taker fee versus Polymarket's variable structure) may influence perceived value differently depending on which range a trader favours.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any tropical cyclone alerts issued in early June, as these significantly affect daily maxima. The Observatory publishes its monthly climate summary and nine-day forecasts regularly; any unusual atmospheric patterns flagged in late May or early June could shift expectations. Settlement hinges entirely on the Observatory's official publication—no alternative data sources are accepted—making timely access to their website critical for confirming the exact recorded value once the market enters its resolution phase.

Methodology

This page compares Highest temperature in Hong Kong on June 10? 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 Polymarket Alternative, 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). Polymarket Alternative 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 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.

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.

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.