Highest temperature in Hong Kong on June 23?

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Market context

Hong Kong is entering its peak summer heatwave on 23 June 2026, with the Hong Kong Observatory tracking daily maximums that have already breached 34.6°C earlier in the month. The market’s 0% YES probability for a specific temperature range reflects a crowd assessment that the day’s peak will likely fall within the most common high-temperature bracket for late June, rather than an extreme outlier.

Historical data frames this probability clearly: June in Hong Kong typically sees daytime highs around 30–32°C, with the absolute maximum for June 2025 reaching 35.6°C[4]. The warmest 10-day stretch of June 2026 (21–30) shows highs leveling out near 29.3°C[7], while forecasts for the month suggest averages between 28°C and 32°C[3]. Given that July and August are usually hotter, the crowd implies June 23 will not hit record-breaking extremes, anchoring the resolution in the standard 30–32°C range.

Traders should monitor the Hong Kong Observatory’s “Daily Extract” for the finalized “Absolute Daily Max” value, which is the sole resolution source[4]. The market leans on the catalyst of typhoon activity, as 1.4 days in June are typically affected by tropical storms[2], which could suppress temperatures below the usual peak. Recent RTHK reports indicate Hong Kong is likely to see a top-10 hottest year on record in 2026, suggesting elevated baseline heat but not necessarily a June 23 outlier[10]. Watch for any hail warnings or sudden rainfall, as these have already triggered temperature dips earlier in the month[8].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Hong Kong on June 23? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. Trump Prediction routes every trade through to Polymarket — at 0% fees.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

Where can I trade this market with the lowest fees?

On Trump Prediction, 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?

Trump Prediction 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.

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.