Highest temperature in Hong Kong on July 25?

Platform comparison

Market context

Hong Kong’s late-July weather is usually hot, humid and volatile, but the settlement for this market depends on the Hong Kong Observatory’s recorded maximum on 25 July, not the broader monthly average. The current crowd-implied 2% YES sits well below the market’s leading temperature bands, with traders leaning instead on a short-range forecast around 33°C and 34°C for the day. The Observatory’s own climatology shows July highs typically around 32°C, while weather services describe late-month conditions as warm enough for peak readings to cluster near the seasonal norm rather than break sharply above it.[1][2][4]

Comparable cases suggest the main risk to a very high outcome is cloud cover and rain suppressing daytime heating. The Observatory reported July 2024 as unusually hot, with a monthly mean maximum of 32.4°C, but also noted rainfall 19% above normal, and that mix of heat plus unsettled weather is a useful reference for how quickly showers can cap extremes.[3] By contrast, the rare truly exceptional July spikes in Hong Kong have tended to come with distinctive synoptic setups such as typhoon proximity, which can drive isolated district readings far above the usual range.[5]

For traders, the key catalyst is the Hong Kong Observatory’s day-ahead and same-day forecast path into the 25th, especially whether showers persist or skies clear enough for stronger afternoon heating. The market is leaning on that forecast rather than on any political-style event calendar, so the most relevant updates are the Observatory’s published maximum-temperature guidance and any rainstorm or thunderstorm warnings that would imply less solar heating. The current Polymarket pricing reflects that balance: a modest bias towards low-30s outcomes, but not enough confidence for a large YES probability.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Hong Kong on July 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. For users geo-blocked from Polymarket directly, brokers like Election Predictions UK provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.