More than a month's worth of rain has fallen in an hour just outside Wangaratta in the state's north east on Saturday.

The Bureau of Meteorology has issued a severe thunderstorm warning for parts of the state's northern country and north east, with flash flood warnings in place for Euroa and Wangaratta.

Wangaratta copped a month of rain in a day on Saturday. Credit:Liam Mannix

Senior forecaster Richard Carlyon said heavy rainfall hit Wangaratta Airport, about eight kilometres outside the city centre, from about 8pm.

"Wangaratta's copped the most rain," he said.