Highest temperature in Paris on July 24?

Platform comparison

Market context

On 24 July 2026, the highest temperature recorded at Paris-Le Bourget Airport will determine the settlement outcome for this market. The resolution hinges on a single daily maximum reading from Wunderground's historical weather database, making this a straightforward factual event with minimal ambiguity once the day passes. Currently showing 0% implied probability across the crowd, this reflects either extreme confidence in a specific temperature band or thin liquidity at the extremes of the range.

Paris's July climate is well-documented. Historical data from the past two decades shows peak summer temperatures in the city typically range between 24–28°C, with occasional spikes to 30°C or above during heat waves. The 2003 European heat wave saw Paris reach 40°C, whilst more recent Julys have averaged around 25–26°C. Comparing across platforms reveals structural differences: Polymarket's decimal odds format and Kalshi's binary yes/no structure handle temperature ranges differently, with Kalshi's narrower KYC requirements in the UK potentially drawing different trader pools than Betfair's established weather book. Fee structures also diverge—Polymarket charges 2% on winnings, whilst Kalshi's model varies by product type—affecting expected value calculations on tight temperature bands.

Traders should monitor European weather forecasts from mid-July onwards, particularly any alerts from Météo-France regarding heat systems moving northward. The North Atlantic Oscillation pattern and jet stream positioning in early July will signal whether anomalous heat is likely. Seasonal trends favour temperatures in the 24–28°C band, but the 0% crowd reading suggests markets may be pricing in either a cooler-than-average day or extreme confidence in a specific narrow range.

Methodology

This page compares Highest temperature in Paris on July 24? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative UK has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.