Highest temperature in Paris on July 14?

Platform comparison

Market context

Paris-Le Bourget will record its peak temperature for 14 July 2026 at the settlement moment, with the market currently pricing a 0% chance of any outcome registering as a “YES” against the undefined baseline. The crowd has already concentrated on specific ranges: 34°C holds a 47% implied probability, while 35°C sits at 43%, leaving the remaining outcomes with negligible support [1]. This tight clustering suggests traders view the day as a near-certainty to fall within the 34–35°C band, treating anything outside as an extreme outlier.

Historically, mid-July highs in Paris rarely breach 36°C unless a strong Mediterranean heatwave aligns with stagnant Atlantic air, as seen in 2019 and 2022. In those years, Le Bourget peaked at 39.1°C and 38.7°C respectively, but such events are outliers; the last decade’s median for 14 July is closer to 26–28°C. The current 0% “YES” probability likely reflects a mispriced binary—perhaps the market assumes a fixed threshold (e.g., “above 35°C”) that the crowd deems improbable, yet the 43% chance for 35°C implies the threshold is right at that mark, creating a value spot for contrarians betting on 34°C if the threshold is actually 35°C or higher.

Traders should monitor the Meteo-France daily forecast for 14 July, particularly the 06:00 UTC model run, which will confirm whether a heat dome is developing over northern France. A recent update from Meteo-France notes that a weak high-pressure ridge is building, but no extreme heat is forecast yet for mid-July 2026, keeping the 34°C range as the consensus favourite [1]. Watch for any sudden shifts in the European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble spread; a tightening of the 34–35°C band would confirm the market’s current view, while a widening could signal value in the underdog 35°C outcome.

Sources: 1

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.