"There! They'll repel water!"

The Impervius Charm[4] (Impervius[4][1]) was a charm that caused an artefact to become waterproof[1] or allow someone better sight in bad weather conditions by preventing the rain from hitting their faces.[4] The charm could also be used to repel mist[3].

Known uses

Caster(s) Date Notes
Hermione Granger 1993-1994 school year Hermione used this spell to make Harry's glasses repel water during a rainy Quidditch match in their third year.
1 May, 1998 Hermione used this in an attempt to protect herself, Ron Weasley, Bogrod, and Griphook from the burning, multiplying treasure in the vault.
Gryffindor Quidditch team 1995-1996 school year The entire Gryffindor team used it on their faces to try to practise in a driving rain, but they still gave up after an hour.

Know practitioners


The incantation is derived from the English word "impervious", which means "not allowing something to pass through" or "not penetrable".

Behind the scenes


Notes and references

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Harry Potter and the Prisoner of Azkaban, Chapter 9 (Grim Defeat)
  2. Scholastic Harry Potter Official Pronunciation Guide
  3. 3.0 3.1 Bloomsbury Glossary: I
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Harry Potter and the Order of the Phoenix, Chapter 18 (Dumbledore's Army)
  5. Harry Potter and the Deathly Hallows, Chapter 26 (Gringotts)