Highest temperature in Paris on July 2?

Platform comparison

Market context

The real-world event hinges on the highest temperature recorded at Paris-Le Bourget Airport on 2 July 2026, a date that historically sits within Paris’s warm summer window but remains far from the peak heat of late July. Long-term averages suggest daytime maximums of 24°C with eight hours of sunshine, yet recent years have shattered these norms with extreme heatwaves pushing temperatures above 40°C multiple times in the capital[1]. The current crowd-implied probability of 0% YES likely reflects a conservative interpretation of these averages, ignoring the volatility introduced by the 2026 European heatwaves, which have already seen France record its hottest day ever with peaks reaching 44.3°C in Landes and 40°C in Paris[2][4].

Traders approaching this market programmatically must monitor Météo-France’s daily forecasts and the influx of warm air from North Africa, which has been the primary catalyst for recent record-breaking temperatures[2]. A recent red heatwave alert issued for 54 departments indicates that high temperatures will persist around the clock, creating a dependency on whether this trend continues into early July[3]. The settlement window ends at 12:00 UTC on 2 July, meaning any late-night tropical heat spikes recorded after midnight but before noon will resolve the market, requiring bots to track real-time Wunderground data rather than relying on daily aggregates[2]. With climate scientists predicting 2026 to be the hottest year on record, the historical baseline of 24°C is increasingly irrelevant against the backdrop of unprecedented thermal anomalies[10].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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 Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Polymarket Bot UK 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.