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 which range bracket resolves YES. The settlement window closes at midday UTC, meaning the full daily high must be captured before markets lock. Wunderground's historical data for this station serves as the single authoritative source, accessible via the gear-icon temperature toggle to confirm Celsius readings.

Paris's July climate typically peaks between 24–28°C, though heat waves regularly push readings into the low 30s. The 2003 European heat wave saw Paris reach 40.3°C in August; more recently, July 2022 recorded 32°C as a daily maximum. The 0% crowd probability across major platforms suggests either extreme confidence in a specific range or insufficient liquidity drawing traders into outlier brackets. Kalshi's binary-outcome structure differs markedly from Polymarket's range-based approach here; Betfair and Smarkets offer decimal odds conversion that may reveal sharper pricing on mid-range outcomes (26–28°C) versus tails.

Traders should monitor mid-July 2026 weather forecasts from Météo-France and European medium-range models, typically reliable 10–14 days ahead. Atlantic pressure systems and any high-altitude blocking patterns will signal whether continental heat dominates or Atlantic moisture moderates temperatures. Fee structures vary—Polymarket charges 2% on winnings, whilst Kalshi's flat commission and Betfair's commission-on-profit model create different breakeven thresholds for range bets. Early-window entry on undervalued temperature brackets may offer value before seasonal forecasts sharpen.

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 Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

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. Robinhood Prediction Markets 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.