Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Trump Prediction) Pick polygram.ink (preferred broker) |
88% | 12% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
88% | 12% | 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 |
|---|---|
| 36°C | 88% |
| 37°C | 9% |
| 38°C | 1% |
| 29°C or below | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 39°C or higher | 0% |
Market context
Shenzhen’s weather market is leaning on whether the airport station reaches a hotter reading than the current summer norm, and the early read is firmly in the high-20s to mid-30s Celsius range rather than anything extreme. Forecasts for 10 August point to a very hot day, with AccuWeather showing a high of 97°F and WeatherAPI putting the day’s maximum near 36.6°C, while Weather Underground’s own history page for Bao’an has already shown 98°F on 8 August, which underlines that the station can easily reach the mid-30s Celsius in August.[9][7][6]
For context, Shenzhen in August is usually hot, humid and rain-prone, with climatology around 32°C to 33°C highs and about 27°C lows, so a reading in the low-to-mid 30s is more representative than a sudden outlier.[12][8] That helps explain why a 0% implied YES price looks detached from the weather baseline rather than from a clear forecast signal; if anything, the market is pricing in uncertainty over the exact resolution source and the station’s peak rather than a fundamentally cool day.[14][6]
The main catalyst to watch is the intraday progression at Shenzhen Bao’an International Airport, because this market resolves off Weather Underground’s Daily Observations table, not the summary high/low panel.[6] Traders should focus on whether the daytime peak arrives before cloud, showers or sea-breeze effects cap the temperature; current short-range forecasts from AccuWeather and Timeanddate both keep the day hot, with only modest precipitation chances, so the key dependency is whether the airport site prints an observation above the dominant bracket before the late-morning to afternoon period ends.[17][11]
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 Shenzhen on August 10? 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
Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.
Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.
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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