Highest temperature in Paris on July 12?

Platform comparison

Market context

Paris-Le Bourget is bracing for July heat as the 12th unfolds, with the crowd pricing the highest temperature falling into the lowest bracket at 0% YES on Polymarket. Traders on Polygon are locking USDC into conditional tokens, betting that the day’s peak will exceed the minimal range implied by the current zero probability. The market resolves at 12:00 UTC tomorrow, anchored to Wunderground’s official reading for LFPB.

Historical context suggests the 0% pricing is aggressive given 2026’s record-breaking European heatwaves. In June, Météo-France declared 23 June France’s hottest day since 1947, with Pissos hitting 44.3°C and Paris’ Charles de Gaulle Airport reaching 46°C (104°F) on 24 June [2][3]. July 2026 forecasts for Paris show daily highs between 73°F and 102°F (23°C–39°C), with an average of 85°F (29°C), making a sub-20°C peak unlikely [1]. The third heatwave warning for the Paris region, with temperatures potentially reaching 38–40°C, further undermines the zero probability [8].

Traders should monitor Météo-France’s daily bulletins and Wunderground’s real-time updates for LFPB, as the settlement hinges on the official 12 July peak. The third heatwave alert, issued late June, indicates sustained high-pressure systems that could push Paris temperatures above 35°C again [8]. With no major weather disruptions forecast and the heatwave pattern entrenched, the 0% YES price appears disconnected from the observed 2026 climate trajectory.

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 PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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