Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Legal UK) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
100% | 0% | 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 |
|---|---|
| 31°C | 100% |
| 27°C or below | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 37°C or higher | 0% |
Market context
The real-world event driving this market is the peak temperature recorded at Paris-Le Bourget Airport on 28 June 2026, following a historic heatwave that saw Paris reach 44°C earlier in the week before cooling to around 35°C with thunderstorm risks by Sunday[1][7]. Current crowd-implied probability of 0% for the highest temperature suggests traders expect the day to remain well above the lowest resolution brackets, consistent with the week’s extreme plateau where peaks near 40°C were observed from Monday through Thursday[1].
Historical precedents frame this probability: France’s national thermal indicator recently hit a record 29.8°C, while Paris itself recorded its hottest June day at 35.7°C south of London, indicating a baseline where temperatures rarely dip below 30°C in late June heatwaves[2][6]. The 2026 event mirrors May’s unprecedented streak where Paris stayed above 32°C for six consecutive days, reinforcing that a 27°C or below outcome is statistically anomalous during such conditions[8].
Traders should monitor the cooling trend’s confirmation and thunderstorm development, as unconfirmed relief beginning Friday could shift temperatures toward the 30–31°C range rather than lower brackets[1]. Recent coverage from Sortiraparis notes the heatwave is easing but stresses the weekend may bring storms, a dependency that could cap peaks if precipitation intensifies[1]. The regulatory landscape adds another layer: German GlüStV implications and US CFTC reach mean accessibility hinges on “no-KYC up to $1,500” provisions, allowing retail participants to engage without identity verification while staying within legal thresholds for this specific weather market[3].
Methodology
This overview of Highest temperature in Paris on June 28? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.
Resolution & payout
On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.
FAQ
- Is Polymarket legal in my country?
- Polymarket is geo-blocked in the US/UK/EU. Actual usage via the Polymarket interface is not possible there. The legal status itself varies — many countries treat prediction markets as a gray area. Polymarket Legal UK has a different geo footprint.
- How are winnings taxed?
- Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
- Are prediction markets gambling?
- Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.
- Is there a withdrawal cap?
- No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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