Highest temperature in Hong Kong on June 25?

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Market context

The underlying real-world event is the daily high temperature recorded by the Hong Kong Observatory on 25 June 2026, with the market currently assigning zero probability to any outcome above the baseline range. Historical data frames this 0% YES probability as a statistical anomaly rather than a meteorological certainty; long-term averages for Hong Kong in June show daytime maximums typically reaching 30°C with high heat and humidity, while recent records include a 34°C peak earlier in 2026 and forecast models suggesting above-normal temperatures for the June-August period [2][4][8]. The Polymarket frontrunner for 32°C at 53% and the secondary 33°C outcome at 32% indicate traders expect the actual temperature to cluster tightly within the standard summer range, contradicting the current 0% crowd-implied probability for the highest temperature category [1].

Traders should monitor the Hong Kong Observatory’s finalised "Daily Extract" for the "Absolute Daily Max (deg. C)" once data is published, as the market cannot resolve until this official figure is available [6]. Key catalysts include the seasonal forecast update noting above-normal temperatures driven by the latest ENSO status, alongside potential tropical storm passages which average 1.4 days per June and could cause sudden temperature spikes [4]. Recent weather reports from 24 June indicated a maximum of 33–34°C with scattered showers, suggesting the 25 June reading may follow a similar high-temperature pattern if humidity persists [7]. The market leans on the official Observatory release as the definitive catalyst, with no scheduled political debates or campaign-finance disclosures influencing this purely meteorological outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Hong Kong on June 25? 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. Election Predictions UK 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 Election Predictions 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?

Election Predictions 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Election Predictions 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.