Highest temperature in Paris on July 26?

Platform comparison

Market context

Polymarket prices this July 26 Paris heat contract at **0% YES** today, so the market is effectively saying a qualifying high for Paris-Le Bourget has no chance of landing in the settled band. Because the contract resolves off the **highest temperature recorded at Paris-Le Bourget Airport** on the day, the relevant question on chain is whether USDC-backed conditional tokens will clear against a reading that matches the market’s range, not whether Paris simply feels hot in general.

For context, Paris in late July can produce very wide daily highs: historical July ranges cited by travel-weather references run from roughly **20°C to 43°C**, and recent coverage has warned that the city can still spike into the high 30s or even near **40°C** during a heatwave.[3][2] That matters for a 0% price because these contracts often stay pinned at the extreme only when the expected station maximum is clearly outside the target band; otherwise, even a small shift in forecast confidence can move the implied probability quickly as traders reassess the likely peak at the official airport station.

The main catalysts are the live forecast updates for north-east Paris, any heatwave advisories, and the timing of the afternoon maximum relative to the 12:00 UTC settlement window. Paris guidance still treats the hottest part of the day as roughly midday to late afternoon, which aligns with when traders will focus on whether the official station reading has already printed its daily high.[1] If forecasts later in the day point to cooling after an early peak, the last update before settlement is the one most likely to matter for a Polymarket position.

Sources: 1 · 2 · 3

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

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

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.

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.

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.