Highest temperature in Paris on August 19?

Platform comparison

Market context

Paris is set up as a low-side favourite for a modestly warm day rather than a clean blow-off higher temperature, with the crowd’s 0% YES implying consensus around a reading well below the market’s upper bands. Recent forecasts cluster around the mid-20s Celsius for Wednesday, 19 August, with several services pointing to cloud, showers and a maximum near 24–26°C, while a few higher-end outputs still leave room for a brief pop into the upper 20s. That leaves value, if any, on the tail-risk of a warmer-than-expected midday peak rather than a broad heat move.

The historical framing is simple: Paris can swing sharply on late-summer weather systems, but the market settles on the highest recorded point before noon UTC, so the first half of the day matters more than the afternoon feel. When the pattern is unsettled, the day-high can still be set early by breaks in cloud or a short dry slot; when cloud and showers arrive on schedule, the ceiling tends to cap out quickly. That keeps the underdog case tied to a cleaner, sunnier morning than the current consensus suggests.

Watch the timing of the disturbance more than the headline maximum. Current forecasts highlight a cloudy, showery Wednesday with thunderstorms possible later, which would support a lower peak if rain and cloud arrive before the late-morning window. The key dependency is whether the Paris–Le Bourget Airport station gets any early sunshine before the cloud thickens; if it does, the market can still print a higher range despite the broad cool-down.

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Methodology

This page reviews Highest temperature in Paris on August 19? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win 2026, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 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.