Highest temperature in Hong Kong on August 9?

Platform comparison

Market context

Hong Kong’s 9 August heat reading is the key event here: the Hong Kong Observatory’s final “Absolute Daily Max” for the day will decide the market, and the immediate question is whether the city reaches the mid-30s or stalls a degree or two lower. At 4 a.m. local time, the Observatory was already reporting 31°C, with official forecasts for the day calling for very hot conditions and a city maximum around 34°C, while some commercial forecasters were advertising highs closer to 37.8°C. [10][13][12]

The market’s 0% YES implies traders are treating the current setup as essentially settled against the event, but August in Hong Kong can still run hot enough to surprise on isolated days. The long-run normal maximum for 9 August is 31.6°C, which frames anything in the mid-30s as meaningfully above average rather than exceptional, and recent Observatory reporting shows the territory has already produced 35.8°C this year, with some districts reaching 37°C. [5][2]

The catalyst to watch is the day’s actual evolution in cloud, rainfall and wind, rather than any scheduled political-style event: the Observatory’s hourly readings and afternoon updates will matter most, with final resolution only once the Daily Extract is published. Morning reporting pointed to very hot weather under an upper-air anticyclone, but also noted an unstable low-pressure area nearby, so traders will be leaning on whether that mix suppresses heating or allows another late-day surge. [13][8][3]

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 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

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.

UK Frequently Asked Questions

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.

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 Election Predictions UK 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.

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.