(CNN) Notre Dame survived a massive fire months ago, but the beloved Paris cathedral is facing a new threat: a heat wave.

The high temperatures bearing down on Europe may be a threat to the ailing building, according to Chief Architect Philippe Villeneuve.

"I am very worried about the heat wave because, as you know, the Cathedral suffered from the fire, the beams coming down, but also the shock from the water from the firefighters. The masonry is saturated with water," Villeneuve told Reuters on Wednesday.

The fire destroyed the roof of the 850-year-old building and toppled the spire, which was added during a 19th-century renovation. Investigators believe that the fire started at the center of the roof and spread out, police sources said in April.

Villeneuve said that sensors were placed in the cathedral after the April 15 fire and that there has not been any movement detected since then.

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