Highest temperature in Hong Kong on August 8?

Platform comparison

Market context

Hong Kong’s afternoon heat on 8 August will be settled by the Hong Kong Observatory’s final “Absolute Daily Max (deg. C)” reading, so the market is really a bet on whether the city manages a notably hot peak before the day is closed out. The 0% implied probability for a YES outcome suggests traders are treating the target band as extremely unlikely, but the source used for resolution is the Observatory’s own published daily extract, not live forecasts or private models.[3][6]

Historical context points to August being capable of severe spikes, but the specific upper tail is rare. The Observatory has recorded an all-time high of 36.3°C on 8 August 2015, and 8 August 2020 also reached 34.4°C at the Observatory, showing that the date can produce very hot readings when conditions align.[1][10] At the same time, the long-run normal for 8 August is a mean maximum of 31.7°C, which keeps the centre of gravity below the extreme bands that would usually matter for a market built around the highest daily temperature.[6]

For traders, the main catalyst is whether the day develops into one of Hong Kong’s classic stagnant, sunny August setups, with the Observatory’s hourly readings offering the best intraday guide before the final extract is published.[3][5] Current early-morning observations already show 29°C at the Observatory and 30°C at Chek Lap Kok at 3 a.m., which is warm but still far from a settled peak.[5] The market is therefore leaning on the day’s heat build-up, cloud cover, and any late-morning convection rather than on a scheduled announcement or political-style event; there is no separate catalyst beyond the weather itself and the final HKO release.[3][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Hong Kong on August 8? 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 Trump Prediction 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.

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 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.

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.