A French weather station at Paris‑Charles de Gaulle Airport is under investigation for possible tampering after unusual temperature readings coincided with large bets on Polymarket about Paris temperatures in March and early April 2026.

Météo-France filed a formal complaint with the Roissy gendarmerie brigade for alteration of an automated data processing system after analyzing sensor data.

Another account earned about $14,000 from an anomalous evening temperature spike that occurred a few days earlier, highlighting bets tied to unusual temperature swings.

The article explains how prediction markets operate, noting Polymarket’s role in offering products tied to event probabilities and its media partnerships, while underscoring concerns about manipulation and insider trading.

As of publication, no arrests or suspect identifications had been made and the investigation remained open.