Highest temperature in Paris on July 13?

Platform comparison

Market context

Paris-Le Bourget Airport is set to record its highest temperature for 13 July 2026, with the market currently pricing a specific extreme outcome at just 1% implied probability. This low figure suggests traders view a record-breaking heat spike as highly unlikely, despite France experiencing its hottest day ever in late June 2026, when temperatures hit 44.3°C in Landes [7]. Historical data shows July highs in Paris typically range between 23°C and 31°C, rarely exceeding 32°C, with the all-time national record of 42.4°C set in Paris only on 25 July 2019 [1][2]. The current 1% odds align with sportsbook lines that similarly discount extreme outliers, though some analyst consensus on Kalshi.com hints at slightly higher volatility than Polymarket reflects, creating a minor divergence for cross-platform arbitrage.

Traders should monitor the European Heatwave Alert system and daily forecasts from Météo-France, as a sudden shift in atmospheric pressure could trigger rapid temperature spikes. Recent news confirms France is under a red heat-wave alert following the June record, indicating sustained high-pressure systems that could persist into mid-July [8]. The settlement relies exclusively on Wunderground data for Paris-Le Bourget, meaning any discrepancy between regional averages and this specific station’s reading will determine resolution. With the window closing at 12:00 UTC on 13 July, real-time updates from the station become critical as the day progresses, particularly if cloud cover fails to develop or if a southerly wind surge occurs.

Sources: 1 · 2 · 3 · 4 · 5

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 PolyGram. 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.