Highest temperature in Paris on July 16?

Platform comparison

Market context

Paris will experience its peak daytime heat on 16 July 2026 at the Paris-Le Bourget Airport Station, with the market settling on which Celsius range captures that highest reading. In prediction markets, a YES share wins if the temperature falls within the specified range, while a NO share wins if it does not; the current 0% crowd-implied probability for YES suggests traders believe the outcome will lie outside the chosen bracket.

Historical July highs in Paris typically reach 25–32°C, though extreme heatwaves have pushed readings above 40°C, as seen in 2019 and 2022 when temperatures hit 42.6°C and 41.5°C respectively at nearby stations. The 0% probability likely reflects a mismatch between the market’s range and these established extremes, or a specific range that is statistically improbable given long-term climate data for mid-July in the region.

Traders should monitor the Met Office’s seasonal forecasts and any emerging heatwave alerts from Météo-France, which often issue early warnings for extreme temperatures in western Europe. While no specific announcement is scheduled for 16 July yet, the timing aligns with peak summer heat patterns, and real-time data from Wunderground will determine the final settlement once the day concludes.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Market 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.