Temperatures across Long Island will fall slightly on Sunday and into the early parts of this week, but there also will be an almost constant chance of rain during the next few days, forecasters said.

News 12 Long Island meteorologist Matt Hammer said Sunday “is not a washout,” but rather “partly sunny with a chance of a leftover shower very early,” with temperatures in the low 80s — close to normal for this time of year.

On Sunday and Monday, there will be chances of showers, said Brian Ciemnecki, a meteorologist with the National Weather Service in Upton.

Temperatures on Sunday will be in the lower 80s and perhaps even the upper 70s on the East End. Ciemnecki added that winds will come out of the east at around 5 to 10 mph.

“It’s just going to be a cloudy day,” he said. “Not a good beach day.”

Ciemnecki said that on Monday, “we’re again looking at a chance of a thunderstorm or showers,” with the same temperatures across Long Island as Sunday.

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Hammer said the possible rain this weekend will come at the most opportune time.

“The rain over the weekend will be coming at a good time — at night — not when we’re all out doing things,” he said.

Ciemnecki said Saturday that the upcoming week will be dry except for Thursday and Friday, when the chances of showers return.

Saturday was a muggy day on Long Island, with highs at 86 degrees.