Highest temperature in Paris on July 7?

Platform comparison

Market context

Paris is bracing for an extreme heatwave on 7 July 2026, with forecasters predicting highs near 41°C at the Paris-Le Bourget Airport Station, far exceeding typical July averages of 25°C. This event is not a statistical outlier but part of a severe, extended heatwave gripping northern France, where red alerts have been issued and cooling centres opened for vulnerable residents[2].

Historical context frames the current 0% YES probability on the prediction market as a clear divergence from cross-platform consensus: Polymarket assigns a 98% chance to 33°C and 26% to 34°C, while meteorological models and recent news confirm temperatures could reach 41°C[1][2]. This mismatch suggests the market is mispricing the event, as comparable cases from June 2026 saw France record its hottest day ever at 44.3°C, with peaks of 40°C across the region[3][7].

Traders should monitor daily updates from Meteo-France and Wunderground, the designated resolution source, for real-time temperature readings and any storm forecasts that might offer brief relief[2]. The heatwave is expected to persist until at least 9 July, with nights staying above 28°C and little cooling relief, making the 33°C–34°C range highly probable despite the current market odds[2]. Analysts note a small chance of storms later in the week, but until then, Paris remains under red alert for dangerous heat[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on July 7? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Best Prediction Markets UK. 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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK 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.