Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Trump Prediction) Pick polygram.ink (preferred broker) |
86% | 14% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
86% | 14% | 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 |
|---|---|
| 29°C | 86% |
| 30°C | 8% |
| 31°C | 4% |
| 32°C | 3% |
| 33°C | 1% |
| 25°C or below | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 34°C | 0% |
| 35°C or higher | 0% |
Market context
Chengdu’s temperature on 6 August will be set by the highest reading recorded at Chengdu Shuangliu International Airport Station, and the market is currently priced at 0% YES despite forecasts pointing to a hot afternoon. Public weather outlooks for the city cluster around the low-to-mid 30s Celsius, with one forecast source putting 6 August near 32–33°C and rain showers, while another official city forecast issued on 5 August still showed Chengdu at 21–35°C for the day.[1][3][12]
The historical frame is straightforward: August in Chengdu is typically hot, humid and often showery, with long-term guides repeatedly placing average highs around 30–34°C and indicating that short, scattered rain does not usually prevent a warm daytime peak.[5][8][11][15] A recent live weather observation also showed Chengdu in the mid-20s Celsius with high humidity, underscoring the city’s summer heat profile rather than any cold-air set-up.[13] For a market that resolves to the day’s maximum, the key comparison is whether the airport station merely reaches the low 30s or pushes into the mid-30s.
The main catalyst to watch is the short-range forecast cycle from official and major weather services, not political-style events such as debates or disclosures; in weather markets, the equivalent moving parts are updated hourly forecasts, convective rain timing, and any shift in cloud cover or monsoon moisture. If models keep Chengdu above 32–35°C through the early afternoon before showers arrive, the market should stay sensitive to an upward move; if rain intensifies earlier, the ceiling on the day’s high becomes more relevant than the average temperature. The best external checkpoint is the airport-specific reading on the resolution source, because that station’s peak temperature, not the citywide forecast, will decide the outcome.
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 Chengdu on August 6? 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.
- 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 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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