High pressure building over Long Island brings dry conditions and slightly cooler temperatures on Wednesday, the National Weather Service said.

The service’s Upton office said the system drifts offshore Wednesday night, but before it leaves daytime temperatures across Nassau and Suffolk counties will be about 10 degrees cooler than the recent warm spell.

Daily highs will reach 50 degrees, with increasing clouds and a north wind shifting to the southeast at 7 to 11 mph in the afternoon.

See alsoCurrent conditions

That’s still slightly warmer than normal, the service said. Daily highs for this time in December are about 43 degrees, the service said.

News 12 Long Island meteorologist Rich Hoffman said it will feel a bit more like winter, including the weekend.

“We will have a shot of December-like temperatures this weekend but overall warm temperatures through Christmas,” Hoffman said.

Light rain and drizzle are possible late Wednesday, mainly after 10 p.m., the service said.

The nighttime turns cloudy, and there could be spotty showers, drizzle and fog with overnight lows in the low 40s, Hoffman said.

On Thursday, expect spotty showers in the morning with drizzle and fog continuing. Daily highs will be in the mid 50s.

advertisement | advertise on newsday

Steady rain is likely during the evening rush hour, Hoffman said. “Some rain will be heavy at times,” he said.