Highest temperature in Paris on July 9?

Platform comparison

Market context

An intense heatwave is gripping Paris and Île-de-France, with Météo-France issuing an orange alert for Thursday, 9 July, and Friday, 10 July 2026. Forecasts predict peaks reaching 38°C on Friday, following highs of 35–36°C this afternoon, while overnight lows remain oppressive between 20–24°C. This extreme thermal event frames the current market where the crowd-implied probability for a specific temperature range sits at 0%, suggesting traders believe the actual maximum will fall outside the offered bracket despite the scorching conditions.

Historical precedents show Paris has recorded temperatures as high as 42.4°C on 25 July 2019, and recent days in July 2026 saw peaks near 41°C, indicating that 38°C is a plausible ceiling for this heatwave. However, a divergence exists between prediction-market implied probabilities and analyst consensus; while some platforms show implied odds of 38.5% for a 34°C maximum, the 0% crowd probability here implies a strong belief that the true maximum will exceed or undercut the specific range offered. Traders should monitor Météo-France’s daily updates and any emerging storm forecasts, as a small chance of storms later in the week could bring relief and alter the final temperature reading.

The settlement window ends on 9 July 2026 at 12:00 UTC, with resolution sourced from Wunderground’s recorded maximum for Paris-Le Bourget Airport Station. Given the orange alert and forecasts of renewed spikes to 37–38°C on Friday afternoon, the actual maximum is likely to be high, yet the market’s 0% probability suggests the offered range is misaligned with the expected outcome. No moralising on trading is necessary; the facts indicate a high-temperature event where the crowd expects the maximum to land outside the specific bracket, creating a clear divergence from other platforms offering positive odds for lower thresholds.

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 Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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

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 Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.