Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Trump Prediction) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 35°C | 100% |
| 36°C | 1% |
| 29°C or below | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 37°C | 0% |
| 38°C | 0% |
| 39°C or higher | 0% |
Market context
On 15 August 2026, Guangzhou will experience peak summer heat, with the market seeking to identify the highest temperature recorded at Baiyun International Airport Station that day. The resolution hinges on Weather Underground's Daily Observations table rather than summary figures, a distinction that occasionally produces variance in reported extremes. Current crowd pricing at 0% YES suggests traders are either uncertain about the specific temperature threshold being tested or are awaiting clarification on which range the market is actually pricing.
Guangzhou's August temperatures are remarkably consistent year on year. Historical data from the China Meteorological Administration shows that daily highs in mid-August typically cluster between 32°C and 35°C, with extreme readings above 37°C occurring in roughly one in five years during particularly intense heat waves. The 2013 heat wave pushed readings to 39°C; more recently, August 2022 saw sustained highs near 36°C. This historical pattern provides the baseline against which traders should calibrate their expectations for any given temperature band.
Traders should monitor tropical cyclone activity in the South China Sea during early August 2026, as typhoons or their remnants can suppress temperatures significantly. Weather forecasting models typically become reliable for specific temperature ranges only seven to ten days before the date in question. The market's current 0% pricing may reflect genuine uncertainty about which temperature bracket will resolve, or it may indicate that the specific range being tested—not disclosed in available documentation—sits outside historical norms. Confirmation of the exact temperature threshold will be essential before meaningful trading positions can be established.
Methodology
This page tracks Highest temperature in Guangzhou on August 15? 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.
- 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.
- 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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