Highest temperature in Paris on July 9?

Platform comparison

Market context

Paris is about to enter its second heatwave of 2026, with Météo France projecting highs of up to 37°C (99°F) starting Wednesday and lasting at least five consecutive days above 35°C through the weekend [2]. This sudden escalation in forecast intensity, shifting from moderate summer warmth to an orange-alert heat dome driven by El Niño and a North African heat cell, explains why the crowd-implied probability for any specific temperature range has collapsed to 0% [3]. The market now reflects extreme uncertainty rather than a lack of heat, as the atmosphere is primed for temperatures that could shatter all prior records regardless of the season [5].

Historically, Paris July highs average 84°F (29°C), but the 2026 forecast range of 73°F to 101°F (23°C to 38°C) dwarfs typical variability, with southern France potentially reaching 41°C (108°F) [1][3]. Traders should watch the official orange alert issuance for the greater Paris region, including Hauts-de-Seine and Seine-Saint-Denis, which is expected within days and will confirm the severity of the "tropical nights" where temperatures stay above 20°C after dark [2]. The critical dependency is the jet stream's waviness; if it remains pinned as forecasters predict, the heat dome will persist through Friday and Sunday, the most intense days of this event [2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

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

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Today 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.