Highest temperature in Paris on July 27?

Platform comparison

Market context

Paris-Le Bourget Airport will record a daily maximum temperature on 27 July 2026, and this market segments that outcome into discrete Celsius ranges. The settlement hinges on a single data point: the highest temperature logged at the station across all hours of that day, pulled from Weather Underground's historical records. For traders building automated resolution workflows, the critical dependency is the station's continuous operation and data availability; any gaps in reporting would require manual adjudication against backup sources like Météo-France.

July temperatures at Le Bourget historically cluster between 24–28°C as daily highs, though heat waves have driven readings above 35°C in recent decades. The 2022 European heatwave saw Paris exceed 40°C; conversely, cooler Julys have peaked near 20°C. This range variance means the current 0% probability assigned to whichever range the crowd has selected reflects either extreme confidence in a narrow outcome or insufficient liquidity to price tail scenarios. Traders should cross-reference the specific temperature bands offered against climatological percentiles for mid-summer Paris to identify mispriced edges.

Meteorological forecasts become actionable only in the final 10–14 days before settlement; longer-range models carry insufficient skill for daily maxima precision. The key catalyst is mid-July European weather pattern data, particularly whether Atlantic systems deliver cooler air or if high-pressure systems establish over continental Europe. Traders automating conditional orders should set triggers tied to ensemble forecast updates from ECMWF or GFS rather than attempting to lock positions months ahead. The settlement window closes at noon UTC on the day itself, compressing the final resolution window significantly.

Methodology

We track Highest temperature in Paris on July 27? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Polymarket Review 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.