The National Weather Service released these rainfall totals Monday morning...

The National Weather Service released these rainfall totals Monday morning for Nassau and Suffolk, with some parts receiving more than 9 inches since Saturday night. Credit: NWS

Unexpected storms inundated Long Island this weekend, dropping nearly 10 inches of rainfall in some parts and causing extensive flooding.

Meteorologists said between 6 to 10 inches of rain fell overnight and warned that by 1 a.m. between 2 to 4 inches of rain were falling per hour.

The highest rainfall amounts on Long Island occurred in Miller Place and Stony Brook, which both recorded more than 9 inches, according to the National Weather Service.

Commack, St. James, East Setauket and Smithtown all recorded more than 7 inches of rain. More than 6 inches of rain fell in Dix Hills, Setauket, Hampton Bays and Selden, the weather service reported Monday morning.

In Nassau County, more than 4 inches of rain fell in North Massapequa and Old Westbury, officials said.

The service released the following rainfall totals for Saturday night through Monday morning. Tap on a spot on the map for more information.

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Everything you need to know about Election Day and more from NewsdayTV

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Everything you need to know about Election Day and more from NewsdayTV

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