Highest temperature in Paris on June 30?

Platform comparison

Market context

A historic heat dome is currently sweeping across France, shattering meteorological records and pushing temperatures in Paris toward or above 40°C. This extreme event frames the current prediction market, where the crowd-implied probability of reaching the highest temperature range sits at 0% YES, despite the physical reality of widespread readings exceeding 35°C and potential peaks near 39°C or higher in the Paris region[1].

Historical precedents from this week show Paris hitting 40.3°C on 29 June 2026, with the national average reaching a record 29.8°C across 30 stations[2][4]. The divergence between the 0% market probability and the analyst consensus on a 40°C+ day is stark, as sportsbooks and weather models have adjusted lines to reflect the intensity of this red-alert heatwave that has already killed 18 people across France[6]. Traders should monitor the daily Wunderground updates for Paris-Le Bourget Airport, specifically watching for any sudden shifts in the heat dome’s trajectory or official announcements from Météo-France regarding the peak thermal indicator expected by 30 June[1]. The settlement window closes at 12:00 UTC on 30 June 2026, meaning the final resolution depends entirely on the highest temperature recorded for all times on that day, with recent data suggesting the capital could top 40°C mid-week[6].

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.

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.