Highest temperature in Hong Kong on July 21?

Platform comparison

Market context

Hong Kong faces a mid-summer heat check on 21 July 2026, with the Hong Kong Observatory set to record the day’s absolute maximum temperature in degrees Celsius. The market currently assigns 0% probability to any outcome, reflecting the absence of published data for this date, as settlement depends entirely on the finalised “Daily Extract” from the Observatory.

Historically, Hong Kong’s July highs typically range between 32°C and 35°C, with extreme days occasionally reaching 36°C or higher during strong subtropical ridges or ENSO-driven warmth. The seasonal forecast for July–September 2026 indicates temperatures are expected to be normal to above-normal, increasing the likelihood of a high reading near the upper end of the usual band [3]. Comparable cases from recent years show that when above-normal conditions align with clear skies and weak winds, peak temperatures often exceed 34°C, making lower ranges increasingly improbable.

Traders should monitor the Observatory’s hourly readings and the upcoming Daily Extract, which will publish the confirmed “Absolute Daily Max” once data is finalized. The 9-day forecast already notes sea surface temperatures at North Point reached 25°C on 21 July, a factor that can amplify daytime heating if atmospheric conditions remain stable [2]. No political catalysts, debates, or campaign disclosures influence this weather market; the sole dependency is the official meteorological release, with no scheduled announcements beyond routine observational updates [4].

Sources: 1 · 2 · 3 · 4

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 21? 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

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

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.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.

How fast do political markets react to news?

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.

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.

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.