Highest temperature in Paris on August 19?

Platform comparison

Market context

Paris is facing a sharp late-summer cooling risk rather than a clean heat continuation, with late forecasts clustering around the mid-20s Celsius and some showing thunderstorms or showers by Wednesday afternoon. One market-relevant point is that the contract resolves from the highest reading in the Daily Observations table at Paris-Le Bourget Airport, so an early-morning warm start will not matter if cloud and rain cap the day’s peak before midday.

The current 0% YES implied probability looks materially lower than the broader forecast range. Time and Date points to an 80/66°F day with isolated thunderstorms late and a high near 27°C, while Weather Underground-linked commentary suggests 25–27°C; by contrast, recent French heat reports and media coverage have shown Paris near 38–39°C during the earlier heatwave, which frames how quickly conditions have already eased. The key comparison is that sports-bet style pricing, if any is available, would usually reflect the same temperature band rather than the outright heat narrative seen a week earlier.

What traders should watch now is the timing of the Atlantic front and whether showers arrive early enough to suppress the daily maximum before the settlement window closes at 12:00 UTC. A more overcast morning, stronger west or south-westerly flow, or faster-than-expected precipitation would favour a lower high, while any delay in cloud and rain would keep the upper end of the forecast band alive. Recent French coverage has already flagged a turning point on 19 August, with cloud and showers expected to dominate over the capital.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on August 19? 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

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

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.

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 Best Prediction Markets 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.