Highest temperature in Paris on July 7?

Platform comparison

Market context

The real-world event driving this market is the peak daily temperature recorded at Paris-Le Bourget Airport on 7 July 2026, with the market currently pricing a 33°C outcome at 98% probability, while the user’s prompt notes a 0% chance for the “YES” side of an unspecified binary contract, likely reflecting a misalignment in contract definition rather than the underlying weather forecast[1]. Historical context frames this extreme: France experienced its hottest day since 1947 on 23 June 2026, with Pissos hitting 44.3°C, and a red alert persists across 54 departments as temperatures remain elevated around the clock[5][7]. Comparable July 2026 forecasts for Paris show daily highs ranging from 74°F to 99°F (23°C to 37°C), with an average high of 85°F (29.4°C), making 33°C plausible but not unprecedented in this heatwave cycle[6].

Traders approaching this programmatically should monitor Meteo France’s hourly updates and Wunderground’s real-time station feed for Paris-Le Bourget, as the resolution source is explicitly tied to that data stream[2]. The immediate catalyst is the ongoing red heatwave alert, with officials warning of highs reaching 41°C (106°F) on 7–8 July, dry conditions, and nights staying above 28°C, all of which support the 33°C frontrunner[2]. A recent Reuters report from 19 June confirmed a significant, extended heatwave impacting France, with temperatures peaking at 40°C and likely rising further, reinforcing the trend toward extreme highs[3]. Conditional orders should be set to trigger on Wunderground’s 12:00–18:00 UTC window, as this period captures the peak heat, and any storm activity later in the week—though unlikely—could introduce volatility[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on July 7? 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 Review UK, 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 Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.