Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Trump Prediction) Pick polygram.ink (preferred broker) |
66% | 34% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
66% | 34% | 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 |
|---|---|
| 32°C | 66% |
| 33°C | 22% |
| 31°C | 8% |
| 30°C | 2% |
| 34°C | 2% |
| 35°C | 1% |
| 28°C or below | 0% |
| 29°C | 0% |
| 36°C | 0% |
| 37°C | 0% |
| 38°C or higher | 0% |
Market context
Paris is in the middle of a late-summer heat setup, and the market is really about whether the airport station at Le Bourget gets into the low-to-mid 30s Celsius before the daily cycle turns over. Current forecast products are clustered around a **32–34°C** daytime high for 11 August, with AccuWeather and The Weather Network both pointing to a hot, sunny day and AccuWeather flagging an extreme-high-temperature warning for Paris[12][7]. That backdrop makes the crowd’s **0% YES** reading look like a stale price rather than a strong view on the weather itself, especially if traders are still anchored to the exact resolution wording and the fact that only the *Daily Observations* table counts[4].
For comparison, Paris in August often peaks in the mid-to-high 20s Celsius, but the city has a meaningful tail risk of 30°C-plus days, and the 11 August record maximum at Paris weather stations is **39.5°C** in the historical records cited by Météo-Paris[2]. Broader Paris climate summaries also show August highs commonly around the mid-20s Celsius, with occasional spikes well above that range[1][15]. In other words, a 30°C-ish outcome is ordinary enough to be forecastable, while a very hot reading is still plausible when a heat ridge holds over northern France[2][15].
The main catalyst to watch is the short-range forecast into the morning and early afternoon local time, because small shifts in cloud cover, wind, or heat advection can move the station reading by a degree or two and change which band settles. Traders should watch updates from the mainstream forecast desks already calling for extreme heat, especially AccuWeather’s Paris forecast and the wider reporting on Europe’s heat pattern from the New York Times, which noted another summer of intense heat across western Europe[12][13]. If the warm spell persists through the 12:00 UTC settlement window, the market is leaning on whether Le Bourget reports a clean high in the 32–34°C range rather than an undercut from early cloud or a late-morning downgrade[4][12].
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 Paris on August 11? 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.
- 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.
- Why do Polymarket and Kalshi differ on elections?
- Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.
- 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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