Highest temperature in Paris on July 16?

Platform comparison

Market context

Paris is facing an intense heatwave in early July 2026, with forecasters warning temperatures could soar between 36°C and 39°C, potentially reaching 40°C on some afternoons before cooler Atlantic air arrives later in the week [4][5]. This extreme thermal event frames the current market pricing, where the crowd-implied probability for any specific high temperature on 16 July sits at 0% YES, despite the frontrunner outcome of 33°C commanding a 57% probability share across the conditional tokens [1]. The discrepancy suggests traders are hedging against the settlement date falling after the peak heat, as the market resolves based on the highest reading at Paris-Le Bourget Airport Station specifically on that single day.

Historical July data shows average highs around 25°C, but the current forecast indicates a significant deviation with mid-month averages climbing to 30.4°C by late July [2]. Traders monitoring the on-chain USDC positions on Polygon should watch the exact timing of the Atlantic cooling front, as forecasts suggest relief arriving by the end of the week, which could drop temperatures below 30°C before the 16 July settlement window closes [5]. The key catalyst is the daily Wunderground update for the LFPB station, which will confirm if the heatwave persists through the settlement date or if the cooler air arrives earlier than predicted, directly impacting the resolution of these conditional tokens.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on July 16? 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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 PolyGram 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.