Highest temperature in Paris on July 15?

Platform comparison

Market context

Paris will record its peak temperature for 15 July 2026 at the Paris-Le Bourget Airport Station, with the market resolving to the Celsius range containing that daily high. Today, Polymarket prices the YES outcome at 0%, implying the crowd expects the temperature to fall outside the specific range offered in this contract. On Polygon, traders use USDC to buy conditional tokens, locking in positions that settle automatically once Wunderground publishes the official daily maximum for station LFPB.

Historical July data for Paris shows average highs of 26°C, though daily peaks have ranged from 20°C to 43°C in extreme cases [1]. The current 0% probability suggests the market believes the temperature will land in a different bracket than the one defined here, possibly because recent forecasts or seasonal patterns point toward a cooler or hotter day than the contract’s threshold. Comparable heatwaves in recent years have pushed Paris above 40°C, but typical mid-July days often stay near 25–28°C, making precise range selection critical for accurate positioning.

Traders should monitor real-time weather updates from Wunderground and any official heat advisories from French meteorological services as the settlement window closes at 2026-07-15T12:00:00Z. Since the resolution source is fixed to the LFPB station’s recorded maximum, no other Paris locations will affect the outcome. Watch for sudden shifts in forecast models or extreme weather announcements that could alter the expected temperature range before the day ends, as these catalysts directly influence token value on the on-chain market.

Sources: 1

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

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.

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.

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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.