Highest temperature in Paris on July 12?

Platform comparison

Market context

Paris-Le Bourget is currently tracking a mild 33°C on this Sunday evening, yet the market for a record-breaking July 12 heatwave in 2026 sits at a 0% implied probability for the highest temperature bracket. This near-zero pricing treats the event as a statistical impossibility, mirroring the consensus that Paris rarely exceeds 38°C in mid-July. Historical data confirms the city’s absolute peak reached only 42.6°C on 25 July 2019, while average July highs typically hover between 24°C and 25°C [1][4]. Even during France’s most extreme heatwaves, such as the 45.9°C record set in southern France in 2022, Paris-Le Bourget has consistently failed to breach the 40°C threshold, suggesting the crowd is correctly pricing in the station’s relative moderation compared to the south [2][6].

The primary catalyst for any contrarian value lies in the development of the current red heat-wave alert sweeping across France, which has already triggered record thermal indicators for the national average [9]. Traders should monitor the Met Office’s Friday forecast updates and the specific trajectory of the high-pressure system, as a stagnation over the Île-de-France region could push local temperatures toward the 38°C–40°C range, a zone currently ignored by the market [6]. While the 0% probability implies no chance of a record, the presence of active heat alerts and the recent trend of increasingly severe European summers suggests the underdog bracket may offer value if the heatwave intensifies beyond current model expectations [7][10]. The settlement depends entirely on the Wunderground reading for Paris-Le Bourget, making real-time station data the critical dependency for any price movement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on July 12? 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, 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. 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.

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 Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.