Warm and muggy weather will hang over Long Island during this unofficial end-of-summer weekend, with chances of pop-up showers and thunderstorms increasing through Labor Day.

"It's not going to be a total washout, but it won't be the nicest weekend," said David Stark, meteorologist with the National Weather Service in Upton.

Temperatures are expected to be in the low 80s, but because of the humidity it will feel like the upper 80s. The dew point, which measures the moisture in the air, is typically high in the late summer. This weekend, it will be even higher and slightly above normal, Stark said.

Clouds are expected to cover most of the skies with the occasional bright spot.

All beaches operating for the 2013 season in Nassau and Suffolk were open as of Saturday morning, according to the health departments in both counties.

Swimmers and surfers should be aware of a moderate risk of rip currents at Atlantic Ocean beaches, according to a hazardous weather outlook issued by the National Weather Service.

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As per usual in late summer, however, the water will be at its warmest with temperatures in the 70s, Stark said.

"I wouldn't call it your most favorable weekend. Again, I don't think it will be raining the whole time, but it won't be the best sunny, beach weekend," he added.

On this last day of August, forecasters and weather experts nationally are noting a month devoid of Atlantic hurricanes. According to Accuweather.com meteorologist Adrienne Green, there have been only five years since 1960 when there were no hurricanes through August.

That doesn't rule out the potential for an active hurricane season September through November, experts said.