Vandals used bricks to break several windows and then painted the word "fear" on the wall of the Kent Hindu Temple late Thursday night.
Members who came to worship last night were greeted by shards of broken glass after vandals targeted the building.
Regular visitors at the temple said they were not sure if they were targeted for their faith or if neighbourhood teens were just causing trouble, local KOMO-TV reported.
This is the second such incident in recent days in the Washington state.
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In the earlier incident on February 15, unidentified miscreants sprayed swastika and painted "Get Out" on one of the walls of the Bothell Hindu Temple in the Seattle Metropolitan area.
Executive Director of the Washington state chapter of Council on American-Islamic Relations (CAIR) Arsalan Bukahari said many of these acts of aggression target smaller religious groups that some "bigots" think are Muslim.
"Because they choose to target certain places, we have a hunch that it might be biased motivated," Bukahari was quoted as saying by the television station.