Paris' Eiffel Tower and Louvre Museum will close early this weekend as yet another heatwave grips western Europe.

The Eiffel Tower said it would "exceptionally close" at 4 pm on Saturday and Sunday due to high temperatures forecast in the French capital, while the Louvre will shutter at the same time through to Monday.

The Musée d'Orsay art gallery also announced that it would be closing from 5 pm from Saturday through to Wednesday.

24 departments across northwestern France are under a red heat alert on Saturday, according to Météo-France, affecting more than 22 million people.

Temperatures of around 35°C to 38°C area expected across most regions, with highs of up to 39°C forecast from Burgundy to Pays de la Loire.