Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Election Predictions UK) Pick polygram.ink (preferred broker) |
99% | 1% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
99% | 1% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Trade this market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Trade this market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Trade this market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Trade this market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 34°C | 99% |
| 35°C | 1% |
| 31°C or below | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 36°C | 0% |
| 37°C | 0% |
| 38°C | 0% |
| 39°C | 0% |
| 40°C | 0% |
| 41°C or higher | 0% |
Market context
Hong Kong’s highest temperature on 8 August will be set by the Hong Kong Observatory’s final “Absolute Daily Max (deg. C)” reading, with the market only able to settle once the official daily extract is published. At 3 p.m. local time, the Observatory was already reporting 34°C in Central, with 35–37°C readings across several inland districts such as Wong Tai Sin, Ta Kwu Ling and Sha Tin, which shows how quickly the day can still move if late-afternoon heating peaks strongly.[7]
For context, early-August heat in Hong Kong can reach the mid-30s: the Observatory recorded 34.4°C on 8 August 2020, and a much hotter 36.3°C on 8 August 2015, then a record for the station.[13][1] The August daily normal for Hong Kong Observatory is a mean maximum of 31.7°C, so a final reading in the low-to-mid 30s would be warm but not exceptional by local standards.[6] That history makes the current 0% YES crowd signal look more like a data-availability artefact than a forecast of a cool day.
The main catalyst now is the afternoon peak and whether thunderclouds or showers curb heating before the Observatory’s daily maximum is locked in. The HKO’s regional readout already shows enough inland warmth to keep 34–35°C outcomes live, and the market is leaning on that same near-term weather evolution rather than any political-style event calendar or polling shift.[7][5] Traders should watch for the Observatory’s final daily extract and any late-day weather updates, since those are the only dependencies that determine which temperature bucket resolves.[2][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 8? 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
- How accurate are political prediction markets?
- 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.
- 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.
- 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.
- 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.
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