CAMBRIDGE, MA , 10 / 18 / 13: Head of the Charles regatta practice on the Charles River preparing for this weekend's regatta.( David L Ryan/Globe Staff Photo ) SECTION: SPORTS TOPIC Head of the Charles (1)
Crews were out on the Charles practicing today for the weekend’s regatta.
David L. Ryan/Globe Staff

Organizers expect as many as 300,000 people will swarm Boston and Cambridge this weekend to attend the Head of the Charles Regatta rowing competition.

State Police plan to have a host of officers, including uniformed and plainclothes officers, as well as bomb squad, STOP team, and marine and K-9 units, stationed along the Charles River, said Trooper Todd Nolan, a State Police spokesman.

The exact number of police is not being released as a safety precaution, Nolan said.

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“We hope people come with the expectation to enjoy the event,” said Nolan.

The Regatta is the largest two-day rowing competition in the world, according to its website. More than 9,000 athletes will compete in 55 events this weekend, drawing big crowds, the website said.

State Police have monitored state roads for previous Regattas, but are stepping up their efforts this time.

“In light of recent events, it’s always prudent to have extra security,” said Nolan.

Cambridge police said they planned to have additional patrols in the Harvard Square area to compensate for the extra visitors.

Saturday will be a fairly sunny day, with highs in the upper 60s. Conditions will remain dry until the evening, according to the National Weather Service.

The Boston area will draw even more crowds Saturday as the Red Sox face off at Fenway Park with the Detroit Tigers for Game Six of the American League Championship Series. Depending on the outcome of the Dodgers versus Cardinals game, the Sox will play at 4:30 p.m. or 8 p.m. If the series goes to a seventh game, it will be played Sunday night at Fenway.

Sunday will see some early morning showers, but should be sunny for the rest of the day. Temperatures will be in the low 60s, the Weather Service said.

Correction: Because of a reporting error, the State Police unit helping provide security at the Head of the Charles Regatta was misidentified in a previous version of this story. It is the STOP team.