Highest temperature in Paris on July 9?

Platform comparison

Market context

Paris is about to experience its second heatwave of 2026, with Météo-France projecting highs near 37°C in the capital as a potent heat dome settles over Île-de-France. This week, temperatures are expected to peak around 36°C on Tuesday and hold near 35°C on Wednesday, creating a scenario where the 9 July maximum could easily breach the 34°C threshold that the market currently prices at 0% implied probability.

Historically, early July in Paris has seen extreme spikes, including a record 41°C during the previous June heatwave and recent forecasts suggesting northern regions may reach 35–38°C. While Météo-France notes the odds of matching the end-June extremes are low, the persistence of this new heatwave—likely lasting 12 days with no clear end—means the consensus of "no" on 34°C appears mispriced. The value spot sits firmly on the contrarian angle that the heat dome will sustain temperatures above 34°C, especially as southern France could hit 40°C and Paris feels the full brunt.

Traders should monitor the evolution of the heat dome, which remains uncertain according to daily Météo-France updates, and watch for any shifts in the national temperature index that could signal intensification. With the settlement window ending 12:00 UTC on 9 July 2026, the key dependency is whether the dome holds or breaks before Tuesday’s peak; recent reports confirm the heat is returning with dangerous intensity, making the 0% YES price a clear underdog trap for those ignoring the persistent high-pressure system.

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Methodology

We track Highest temperature in Paris on July 9? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 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.