Lowest temperature in Hong Kong on August 9?

Platform comparison

Market context

Hong Kong’s observatory reading for 9 August is the settlement event, and the market will be driven by the day’s lowest *official* temperature rather than the daytime peak. The current 0% yes price implies traders do not yet see a realistic path to a qualifying outcome at the moment, but that can change quickly once the Hong Kong Observatory publishes the Daily Extract for the date and the exact “Absolute Daily Min” is known.[10][14]

For context, Hong Kong is normally very warm in early August: the 1991–2020 normals show a mean minimum of 26.6°C on 9 August and a mean temperature of 31.2°C, which makes a low temperature well below the mid-20s unusual but not impossible.[2] Recent weather references also point to persistent heat in early August, with yesterday’s minimum in Hong Kong reported at 84°F, or about 28.9°C, underlining how far current conditions sit above the sort of figure that would matter for a low-temperature bracket.[1] Comparable August data from local climate sources also show that monthly lows are generally clustered in the upper 20s Celsius, so the distribution is skewed towards relatively high minimums rather than anything close to a cool spell.[5][7]

The main catalyst to watch is the Hong Kong Observatory’s post-event publication timetable, because the market cannot settle until the relevant Daily Extract has been finalised and the official one-decimal Celsius minimum is posted.[10][13] In practical terms, traders are leaning on whether any late-day weather shift, rain band, or overnight cloud cover suppresses the minimum enough to move the outcome across a bracket boundary, but the decisive input will be the Observatory release itself rather than forecasts or third-party weather apps.[10][14]

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 Lowest temperature in Hong Kong on August 9? 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.

UK Frequently Asked Questions

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.

Are UK election prediction markets available from the UK?

Yes. Betfair Exchange and Smarkets offer UKGC-regulated UK election markets (seat counts, party share, constituency results). Polymarket also lists UK election contracts with deeper global liquidity. Betfair winnings are typically tax-free for UK individuals; Polymarket profits are subject to HMRC CGT.