Highest temperature in Paris on July 2?

Platform comparison

Market context

The highest temperature recorded at Paris-Le Bourget Airport on 2 July 2026 will determine the outcome of this prediction market, with the current crowd-implied probability for a YES result sitting at 0%. On Polymarket, this contract is priced in USDC on the Polygon network using conditional tokens, where traders are overwhelmingly betting on a high of 24°C at 47%, followed by 25°C at 35%. The market’s concentration on these lower ranges reflects recent cooling after France’s record June heatwave, which saw peaks of 44.3°C in Landes and a national thermal indicator of 29.8°C, yet temperatures have since dropped significantly.

Historical data frames this low probability: Paris’s record high is 42.6°C from July 25, 2019, with only three instances above 40°C in the capital, while long-term July averages for Paris hover around 24°C with eight hours of daily sunshine. The 2026 European heatwaves, which included an unofficial 50°C reading and red alerts across 54 departments, have subsided, and Météo-France forecasts a relative drop during late June, leaving the city within a fraction of its all-time average rather than approaching extreme peaks.

Traders should monitor Météo-France’s daily bulletins and any sudden influxes of warm air from North Africa, as these could shift the high above 25°C. Recent reports from Le Monde indicate that while a second heatwave was anticipated in mid-June with peaks of 40°C near the solstice, the current trajectory shows a stabilisation rather than escalation. With the settlement window ending 2026-07-02T12:00:00Z, the on-chain mechanics will resolve based on Wunderground data for the Paris-Le Bourget station, making real-time weather updates the primary catalyst for any probability shifts.

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Methodology

This page reviews Highest temperature in Paris on July 2? 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 Kalshi UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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 Kalshi 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.