After a record-cold morning Monday on Long Island, temperatures will gradually warm up starting Tuesday with the thermometer expected to hit 70 later in the week, forecasters said.

The National Weather Service's Upton office said it reached 29 degrees at 7:04 a.m. Monday at Long Island MacArthur Airport, surpassing the previous daily record low of 31 degrees in 1986.

The service issued a freeze warning for most of Long Island that expired at 10 a.m. Monday.

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But plenty of sunshine helped warm up Long Island throughout the day Monday with temperatures climbing into the low 50s across Nassau and Suffolk counties by midday, forecasters said.

News 12 Long Island meteorologist Rich Hoffman said warmer weather will continue, with temperatures climbing gradually through later in the week.

"We have a big warm-up in the next 48 hours as temperatures will approach 70," Hoffman said. He also called for dry conditions over the next seven days.

Credit a high pressure system moving south for bringing milder air to the Northeast after the weekend chill, said Carlie Buccola, a meteorologist at the Upton office.

Overnight lows will average about 50 degrees through Friday, with the average high expected to top out at 64 degrees.

Tuesday will be breezy with southwest winds gusting up to 25 mph and temperatures in the mid-60s, Hoffman said. Temperatures will edge toward 70 degrees by Thursday with a slight chance of showers.

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A cooler but still mostly sunny and dry weekend is expected, with a high of just about 60 degrees Saturday and a low of 52. Sunday will see the mercury hit about 64 for a high, dropping to 53 for a low, according to the weather service.