Highest temperature in Paris on July 16?

Platform comparison

Market context

Paris is about to face an intense heatwave with temperatures forecast to soar between 36°C and 39°C, potentially climbing as high as 40°C on some afternoons [4]. This extreme event frames the current Polymarket pricing, where the crowd has assigned a 0% probability to the "YES" outcome for the highest temperature on 16 July, despite the market frontrunner being 33°C at 53% and 32°C at 30% [1]. The discrepancy suggests traders are betting on the heatwave peaking earlier in the week, with forecasts indicating cooler Atlantic air may arrive by the end of the week to drop temperatures below 30°C [4].

Historical precedents for Paris show that hitting 40°C is extremely rare, occurring only a few times in the city's history, which likely drives the conservative 0% pricing for higher ranges [4]. While July typically sees average highs around 25°C to 30°C by the end of the month [2][3], the current forecast of 35°C to 36°C for early July 2026 represents a significant deviation from the norm [5]. Traders should monitor the specific timing of the Atlantic cooling front, as the settlement relies on the single highest reading at Paris-Le Bourget Airport Station recorded by Wunderground on 16 July.

The on-chain mechanics involve USDC on the Polygon network, where conditional tokens allow users to bet on specific temperature ranges. With the settlement window closing at 12:00 UTC on 16 July 2026, the market will resolve based on the official Wunderground data for that specific day [1]. The key catalyst is the forecasted drop in temperature expected by the weekend, which could validate the current low probability for extreme highs if the cooling arrives before the settlement time [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on July 16? 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

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 Kalshi UK. 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.

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.

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.