Highest temperature in Paris on June 2?

Platform comparison

Market context

On 2 June 2026, the highest temperature recorded at Paris-Le Bourget Airport will fall into one of several defined ranges in Celsius. The settlement hinges on historical weather data from Wunderground, which archives hourly readings from this major meteorological station serving the Paris region. The 0% crowd probability suggests traders are either avoiding the market entirely or have not yet priced in expectations for early June conditions in northern France.

Comparable June temperature data from Le Bourget shows typical highs between 22–26°C, with occasional readings reaching 28–30°C during warm spells. The current zero probability likely reflects low trading volume rather than a genuine consensus that all temperature ranges are impossible. On Polymarket, where this market appears, decimal odds and implied probabilities can diverge sharply when liquidity is thin; Kalshi and Betfair typically show tighter spreads on weather contracts due to higher participation. The settlement window closes at midday UTC on 2 June, giving traders only morning data before resolution—a constraint that may suppress activity compared to end-of-day settlement windows favoured on other platforms.

Traders should monitor European weather forecasts from mid-May onwards, particularly any models indicating heat waves or Atlantic low-pressure systems affecting northern France. Météo-France publishes extended outlooks that often drive repricing of seasonal weather markets. KYC requirements differ across platforms: Polymarket's current restrictions in certain jurisdictions may limit the trader pool relative to Betfair or Smarkets, potentially explaining the absence of meaningful price discovery on this contract.

Methodology

We read Highest temperature in Paris on June 2? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Resolution source: This market settles from the official publication at https://www.wunderground.com/history/daily/fr/bonneuil-en-france/LFPB. A proposer submits the result to the UMA Optimistic Oracle on Polygon, the two-hour challenge window opens, and the smart contract pays out in USDC.

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. PolyGram offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.