Highest temperature in Hong Kong on June 1?

Platform comparison

Active sub-markets

Market context

On 1 June 2026, the Hong Kong Observatory will record the day's maximum temperature in Celsius. This market resolves to whichever temperature band contains that single highest reading, measured to one decimal place and published in the Observatory's Daily Extract dataset. The settlement window closes at midday UTC on that date, though resolution cannot occur until the Observatory publishes finalised data, typically within 24–48 hours of the observation period.

Hong Kong's June climate sits at the threshold between late spring and early monsoon onset. Historical data from the Observatory shows June 1st maxima typically range between 28–32°C, though extremes have occasionally pushed toward 34°C during particularly warm years. The 0% crowd probability currently displayed reflects either the market's nascent stage or a specific temperature band being queried; early-stage weather markets often show skewed probabilities until sufficient liquidity accumulates. Kalshi and Betfair's decimal-odds formats can obscure such thin markets differently than Polymarket's percentage display, making cross-platform comparison difficult when volume is sparse.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any El Niño or La Niña advisories from the World Meteorological Organisation, which influence regional temperature patterns months in advance. The Observatory publishes monthly climate summaries and five-day forecasts; late May 2026 forecasts will provide the most actionable signal. Fee structures vary materially across platforms—Polymarket charges 2% on both sides, whilst Kalshi's regulatory framework and Betfair's commission model create different cost profiles for position sizing. Settlement depends entirely on Observatory data availability; any publication delays would postpone resolution beyond the window close.

Methodology

This page compares Highest temperature in Hong Kong on June 1? 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 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). Polymarket 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 Polymarket 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.

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 UK?

Zero. Polymarket 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.

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.