Highest temperature in Hong Kong on July 31?

Platform comparison

Market context

Hong Kong’s official maximum on 31 July will be set by the Hong Kong Observatory’s daily extract, with the settlement source explicitly using the **“Absolute Daily Max (deg. C)”** once the day’s data is finalised. At 2 p.m. local time the Observatory had already logged **31°C** at its main station, while several urban and near-urban locations were in the **31–33°C** range, which leaves the eventual top reading still dependent on the afternoon’s heat build-up and any localised spikes.[7]

The starting point for reading this market is that late-July heat in Hong Kong is normal, but the upper tail is what matters: the Observatory’s July rankings show monthly maximums reaching **35.7°C** in 1968, **35.6°C** in 2016 and **35.4°C** in 2005, while a recent July also produced **36.1°C** at the Observatory on 27 July 2023.[2][8] By contrast, a 2026 Daily Extract that finishes in the low-to-mid 30s would fit the usual July climate profile rather than a true extreme.[14][16]

The key catalyst is the weather sequence through the rest of the day, not any political-style event calendar. Traders should watch the Hong Kong Observatory’s updated hourly readings and any issued warnings, because the market will ultimately lean on whether cloud, showers or a stronger afternoon heat peak determine the day’s high; recent reporting has already shown how quickly Hong Kong can swing from a routine hot day to a record-setting one, with the city’s weather coverage highlighting 31°C-plus readings earlier in the month.[5][12][15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Hong Kong on July 31? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

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

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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.

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High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

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Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.