Highest temperature in Paris on July 2?

Platform comparison

Market context

A powerful heatwave is set to strike France in early July 2026, with forecasts predicting dangerous temperatures across the country, including Paris and northern regions where highs could reach 35–38°C and feels-like values climbing even higher[3]. This event frames the current prediction market where the crowd-implied probability for a specific outcome sits at 0%, a stark divergence from sportsbook lines that often price similar heat events with more nuance, while analyst consensus on this contract remains heavily concentrated on the 26–27°C range as the most probable high for Paris on July 2[5].

Historical context is critical here, as France recently recorded its hottest day ever on June 23, 2026, with a temperature of 44.3°C (111.7°F) during the European heatwave, making it one of the highest temperatures ever measured in the nation[6][8]. This record-breaking June event serves as the main driver behind the market's concentration on the 26–27°C range, yet the sheer intensity of the incoming heatwave, which is expected to last at least 7 to 10 days with southern France reaching 38–41°C, suggests the current 0% probability may be mispricing the risk of extreme outliers[3][4].

Traders must watch the government-issued heat alerts and the daily forecast updates for the first week of July, as meteorologists warn daytime highs could reach 42°C in the hottest spots while nighttime temperatures may stay above 25°C, offering little chance to cool down[3]. The settlement window ends on 2026-07-02, meaning the resolution source will be the highest temperature recorded for all times on this day at the Paris-Le Bourget Airport Station, available via Wunderground, so any sudden shifts in the heat dome or wildfire warnings could drastically alter the implied odds before the market closes[2][3].

Sources: 1 · 2 · 3 · 4 · 5

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 PolyGram, 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 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.

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.

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.

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.