Highest temperature in Paris on June 26?

Platform comparison

Active sub-markets

Market context

A red heat wave alert now covers 54 French departments as Meteo France confirms the nation’s hottest day ever, with the national thermal indicator soaring past 40°C and Paris hitting nearly 41°C. This extreme surge, which began Tuesday and persists through the week’s end, has shattered the crowd-implied 0% probability for high temperatures, replacing it with a market consensus that 36°C is the leading outcome at 68% [1]. The shift reflects real-time trading activity where traders are aggressively buying shares in the 36°C and 37°C ranges, abandoning the previous low-temperature assumptions entirely.

Historically, June in Paris averages 23.9°C on its warmest day, typically 26 June, but this year’s heatwave has pushed temperatures far beyond the norm, with records exceeding 40°C in multiple areas [5][6]. Comparable cases from previous European heatwaves show that once red alerts are issued, temperatures often stabilise near 36–38°C before declining, as seen in the UK’s record 36.1°C and Spain’s 42°C peaks [7]. The current market pricing aligns with this pattern, treating 36°C as the most probable ceiling before the anticipated Friday respite.

Traders should monitor Meteo France’s daily updates for any changes to the red alert status, as the forecast suggests gradual cooling starting Friday [7]. Key dependencies include the persistence of sunshine across France, which Meteo France cites as the driver of stifling heat, and the potential for additional record-breaking temperatures exceeding prior seasonal records [6]. No new announcements are expected before the settlement window ends 2026-06-26T12:00:00Z, making the current heatwave trajectory the sole catalyst for resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on June 26? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Prediction Today — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Prediction Today triggers a quick verification flow that finishes in 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.