Highest temperature in Paris on July 23?

Platform comparison

Market context

Paris’s highest reading on 23 July will come from the Paris-Le Bourget Airport station, with the market settling on the day’s maximum temperature in Celsius from Wunderground’s daily history page. The current crowd view is already pricing the outcome at **25°C**, which implies the market is treating a mid-20s afternoon as the base case rather than a cooler or extreme-heat day.[1]

That pricing sits comfortably inside July climatology for Paris. July is typically the warmest month, with average highs around **27.0°C** and lows around **16.4°C**, while broader July daily highs can range from about **20°C to 43°C** in historical summaries.[2][3] For a programmatic approach, the practical task is to monitor the station’s rolling max through the settlement window and map the final observed value into the market’s discrete temperature bands, rather than focusing on the midday reading alone.

For traders using bots or conditional orders, the main catalysts are the forecast path into the afternoon, any late shift in cloud cover or convection, and whether the day’s peak arrives before the market’s 12:00Z settlement cutoff in the rules. Paris weather is usually warm and fairly stable in July, but the difference between **25°C** and a higher band often depends on small changes in heating and cloud timing, which is why intraday updates from the station matter more than headline forecasts.[2][4]

Sources: 1 · 2 · 3 · 4

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 Fees, 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 Kalshi Fees. 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.

Do I need to KYC for this market?

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