Police initially planned to arrest the man for disorderly conduct.
The man has been arrested on charges of unlawfully carrying a weapon and trespassing, according to KHOU Houston.
Officers from the Houston Police Department went to the Hyatt Regency Downtown on December 31, after receiving a call from an off-duty colleague. "He said his truck was parked in the hotel garage".
Senties says investigators don't believe the man intended "to use the weapons or to cause any kind of issue".
Houston police arrested an intoxicated man with a cache of weapons in his hotel room early Sunday, according to local media reports.
The Hyatt is preparing its own New Years Eve celebration at the hotel with a 50,000 balloon drop at the stroke of midnight, its website said.
Lt. Gordon Macintosh says other officers arrived to take him into custody and found a rifle, shotgun and handgun in his room, plus ammunition. Houston Police Chief Art Acevedo tweeted about the incident, saying the situation is contained and there is no specific threat to Houston.
A drunk man staying at a Houston hotel had an arsenal of weapons including an AR-15 inside his room ahead of a major New Year's Eve bash, cops said.
A police spokesman said Sunday afternoon that investigators couldn't speculate about the man's intent.