Highest temperature in Paris on July 5?

Platform comparison

Market context

On 5 July 2026, Paris-Le Bourget Airport will record its peak temperature for the day, a single data point that determines the outcome of a prediction market where the current crowd-implied probability for a "YES" result sits at 0%. This near-zero stance contrasts sharply with cross-platform odds, where Polymarket assigns an 84% chance to a 29°C reading and a further 17% to 30°C, suggesting a significant divergence between the implied probability of the primary contract and the collective view of traders on alternative exchanges.

Historical precedents for early July in Paris frame this discrepancy, as recent years have seen temperatures frequently breach the 29°C threshold during heatwaves, with Meteo France recently warning of a severe, extended heat event impacting the region with highs potentially reaching 37°C in the city [4]. The current 0% probability appears to ignore these comparable cases where similar atmospheric conditions, including the El Niño-driven heatwave forecast to last seven to ten days, have consistently pushed northern French temperatures into the 35–38°C range [3].

Traders should monitor the daily updates from Meteo France and the specific temperature logs from Wunderground for the Paris-Le Bourget station, as the resolution source relies entirely on the highest temperature recorded for all times on this day [1]. The upcoming weather schedules indicate that daytime highs could reach 42°C in the hottest spots of southern France, with Paris feeling the heat even if it remains slightly cooler than the south [3]. Any announcement regarding the intensity of this heatwave or a shift in the El Niño pattern will directly influence the likelihood of the temperature landing within the expected 29°C to 30°C range.

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, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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. 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.

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.

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.