Highest temperature in Paris on August 14?

Platform comparison

Market context

On 14 August 2026, the highest temperature recorded at Paris-Le Bourget Airport will determine the settlement of this market. The resolution hinges on the Daily Observations table from Weather Underground rather than the Day High & Low summary section—a distinction that matters when intraday temperature spikes occur. Traders should note that different platforms handle weather data differently; Kalshi and Betfair typically use official national meteorological services as primary sources, whilst this market's explicit reliance on Wunderground's specific data hierarchy creates a potential divergence point if discrepancies emerge between sources.

August temperatures in the Paris region have historically ranged from 15°C to 38°C, with the 30-year average high around 25–26°C. The 0% crowd probability suggests either extreme confidence in a narrow temperature band or insufficient liquidity to establish meaningful odds. Comparable August markets on competing platforms show wider probability distributions, reflecting genuine uncertainty; the absence of any YES probability here warrants scrutiny of whether the market's temperature brackets are misaligned with seasonal norms or if traders are anchoring to recent cooler summers across northern Europe.

Meteorological forecasts become actionable from late July onwards, though seasonal patterns favour moderate temperatures for mid-August in the Île-de-France region. Heatwave alerts from Météo-France, typically issued 3–5 days in advance, will be the primary catalyst traders monitor. The market's settlement window closes at midday UTC on 14 August, creating a hard deadline; traders on platforms with decimal odds (Betfair, Smarkets) versus implied probability displays (Polymarket, Kalshi) may interpret tail-risk scenarios differently depending on how their interface presents extreme temperature ranges.

Methodology

This page compares Highest temperature in Paris on August 14? 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

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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.