Highest temperature in Paris on July 5?

Platform comparison

Market context

The market for Paris’s highest temperature on 5 July 2026 currently prices a 0% chance of hitting the 30°C threshold, despite historical patterns suggesting this is an outlier. In recent years, early July in Paris has frequently seen peaks between 29°C and 32°C, with Météo-France’s modal forecasts often centring near 30°C. For instance, the 2023 and 2024 heatwaves both recorded daily highs of 31°C and 32°C respectively in Paris-Le Bourget, while 2025 saw a peak of 29.5°C. The 0% implied probability contradicts these trends, likely reflecting thin liquidity and a narrow conditional token structure where NO pays out across ten alternative temperature buckets, making it the mathematical favourite even when the modal forecast supports YES.

Traders should monitor the next Météo-France and ECMWF model updates, as the 2026 European heatwave is forecast to intensify across France in early July, with Paris potentially reaching 35–38°C and southern regions hitting 38–41°C [2]. A red heat alert has already been issued for 54 departments, indicating sustained high temperatures through the week [3]. The resolution depends entirely on the official daily maximum recorded at Paris-Le Bourget Airport via Wunderground, with no room for proxy data. Any deviation in the forecast—such as a shift toward cloud cover or rain—could rapidly alter the probability, but current on-chain pricing on Polymarket (USDC, Polygon) remains locked at 0% for YES, suggesting the market is either mispriced or awaiting a definitive catalyst before adjusting.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on July 5? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Scam?, which mirrors the Polymarket order book at 0% fees.

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 Polymarket Scam?. 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.

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.

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.