Thunderstorms possible through holiday

Fourth of July fireworks could face competition from something less festive—lightning.

“It looks like the highest chance [for thunderstorms] during the week would be on Wednesday, but that’s still four days away,” said Glenn Field, a meteorologist for the National Weather Service in Taunton. “I would say go about your normal activities, but stay mindful of the sky.”

Saturday, when temperatures reached a high of 97, Boston’s Best Cruises hauled about 900 people around the Boston Harbor to see the tall ships come in between 9 a.m. and noon. Some of the cruises took passengers to Spectacle Island, where they could hike to the peak and get a better view of the harbor.

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Christopher Martin, guest services coordinator, said staff members try to help passengers handle the heat.

“We usually just tell people to take a lot of breaks and stay hydrated,” Martin said in a phone interview from the company’s Quincy office. “We give them a drink of water and tell them to stay in the shade.”

There is a small chance of morning thunderstorms Sunday and temperatures are expected to stay in the low 90s throughout the day, according to the National Weather Service.

“I guess that’s good for the beaches,” Field said.

Sunday night should be a little cooler with temperatures dipping to 68 degrees and a thunderstorm is possible. The rest of the week, highs are expected to stay in the mid-80s, according to the National Weather Service.

There is a small chance of intermittent storms Monday.

Tuesday will likely be drier, Field said, but the sky might not stay clear for fireworks Wednesday night.

Despite possible storms, harbor cruises will likely continue until the tall ships leave the harbor Thursday, Martin said. The company’s boats have covered decks, and canceling a cruise is “rare.”

“We pretty much run in all weather,” Martin said. “Rain doesn’t bother us ... Thunderstorms might be a little bit dicey.”