Highest temperature in Paris on July 9?

Platform comparison

Market context

The highest temperature recorded at Paris-Le Bourget Airport on 9 July 2026 will determine the outcome of this contract, which currently prices the YES option at 0% implied probability. On Polymarket, this conditional token trades on the Polygon network using USDC, where the market’s zero pricing suggests traders believe the temperature will fall outside the specific range required for settlement. The on-chain mechanics lock positions until the settlement window closes at 12:00 UTC on 9 July 2026, with resolution sourced directly from Wunderground’s daily history for the station.

Historical precedents and recent forecasts frame this near-zero probability as potentially premature. A powerful heatwave is expected to impact France during early July 2026, with Paris and northern regions likely experiencing daytime highs between 35°C and 38°C, while feels-like temperatures climb even higher[3]. Météo-France has confirmed a new period of extreme heat lasting approximately 12 days, with Paris potentially seeing a full week of temperatures above 35°C and tropical nights[6]. Recent data from the week of 6–12 July 2026 shows a peak near 36°C on Tuesday, indicating that conditions are extremely hot and sunny[2].

Traders should monitor the persistence of this heatwave and any official announcements from Météo-France regarding temperature thresholds. The national weather service does not currently see an end to the new heatwave, which could persist until after 14 July, though uncertainty remains high[6]. Key dependencies include the exact timing of the peak heat, which meteorologists suggest could reach 42°C in the hottest spots across southern and central France[3]. With the heatwave set to last 7 to 10 days, the window for 9 July falls squarely within the most intense phase, making the current 0% pricing a significant divergence from the forecasted reality[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 Kalshi 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 Kalshi 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 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 Kalshi 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.