Highest temperature in Paris on July 2?

Platform comparison

Market context

On 2 July 2026, Paris-Le Bourget will record its peak daily temperature, a single real-world metric that determines the outcome of this weather market. The crowd-implied probability for the "YES" outcome sits at 0%, reflecting a consensus that extreme highs are unlikely following France’s record-breaking June heatwave. Historical data shows average July highs in Paris hover around 26°C, with a typical range of 20°C to 43°C, while the current market frontrunner is 24°C at 47% probability, suggesting traders expect a return to seasonal baselines rather than continued extremes.

The primary catalyst for traders to watch is Météo France’s latest forecast, which recently projected a second heatwave starting Wednesday with highs up to 37°C in Paris, potentially challenging the all-time July record. This announcement introduces a contrarian angle: if the heatwave materialises, the 0% implied probability for higher ranges becomes a significant value spot, as the market currently underweights the risk of a sudden temperature spike. Recent news from NBC News confirms Europe is suffering a brutal heatwave, with France recording its hottest day ever at 44.3°C in Landes, indicating that atmospheric conditions remain volatile and capable of producing unexpected spikes even after a cooling period.

Traders should monitor the settlement window closely, as Wunderground data will be the definitive resolution source, and any revisions to temperatures within the timeframe will be considered until the first datapoint for 3 July is published. The consensus leans heavily toward 24–26°C, but the value lies in the contrarian bet on 37°C if the projected heatwave intensifies, turning the current 0% probability into a high-risk, high-reward opportunity. With daylight hours extending to 15 hours and 40 minutes, the potential for solar heating remains substantial, making the second heatwave a critical dependency for any trader assessing the true likelihood of extreme temperatures.

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Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win 2026, which mirrors the Polymarket order book directly.

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 Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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 Who Will Win 2026 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.