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From the mountains to the sea, it’s looking to be a mild week of weather — warming up at midweek, then bringing a chance of showers and even some snow at resorts over New Year’s weekend.

An offshore flow could elevate temperatures to nearly 70 degrees on Tuesday and into the 70s on Wednesday under mostly sunny skies, the National Weather Service said Monday.

The warming trend may linger Thursday before the first of two weather systems moves in from the southwest either late Thursday or Friday with a chance of showers, said Brandt Maxwell, a forecaster with the National Weather Service.

As that system moves inland, a second, colder system from the north might bring showers on New Year’s Eve with daytime highs in the 50s across much of the region with potential fresh snow in the mountains.

Brian Edwards, a meteorologist with AccuWeather, said the weekend outlook is unclear. “The models disagree on the timing and the strength” of the second system, Edwards said.

Either way, there should be ample snow at resorts for skiers and snowboarders ringing in the new year on the slopes, while at the beaches, people who plan to greet 2017 by hopping into the ocean can expect a chilly reception.

Huntington Beach lifeguard Lt. Eric Dieterman reported the ocean temperature was 56 degrees Monday at the Huntington Beach Pier — “not as nasty as 30-something, but pretty nasty.”

On New Year’s Day for the 17th year, brave souls will gather at Huntington Beach for the Surf City Splash, an annual ritual in which participants — often in costume — plunge into the chilly Pacific.

The same tradition will play out at Cabrillo Beach in San Pedro, where the Cabrillo Beach Polar Bears will gather at 11:30 Sunday for cocoa and cookies and then make the plunge into the chilly waters at noon. The club has gathered for its annual swim to ring in the new year since 1953.

For New Year’s Day, Sunday’s daytime high is expected to be in the high 50s at the coast to 60 degrees in Los Angeles.

Some other New Year’s forecasts include:

• Long Beach: A high of 58 and low of 44 on Saturday (New Year’s Eve) with a high of 58 onSunday (New Year’s Day)

• Los Angeles International Airport: A Saturday high of 56, an overnight low of 47 and a Sunday high of 56

• Big Bear: A high of 40 and low of 24 on Saturday, with a high of 34 on Sunday

• Ontario: A high of 56 and low of 45 on Saturday, with a high of 55 on Sunday