Long Islanders getting ready for Memorial Day parades, barbecues and boat outings can look forward to sunny, warm and dry conditions Sunday and Monday with no rain in the forecast until the middle of the week, according to meteorologists.

And as the week goes on, it will begin to feel like summer.

"There's a high pressure system offshore that stays offshore through the middle of the week with winds out of the southwest allowing for an increasingly warm and humid air mass to build into the region," said John Murray, a meteorologist with the National Weather Service at Upton. "This weekend will continue to be pleasant weather and mostly sunny and dry."

News 12 Long Island meteorologist Samantha Augeri said it might be time to head for the beach, even though it's not really warm enough yet for a swim.

"We're transitioning into more of a summerlike pattern -- an average high for the week is about 72 degrees," Augeri said. "Today [Sunday] it looks like a fine beach day. It's still probably too cool to go swimming, but it's a nice day to sit in shorts and a shirt."

Highs Sunday will be in the upper 70s in northern Suffolk and Nassau counties with the southern portions averaging in the low to mid-70s.

"Mostly sunny conditions are expected throughout the day and winds and winds won't gust too much today -- generally they'll be around 10 to 15 miles per hour," Murray said.

advertisement | advertise on newsday

Lows at night will be in the 50s. "It'll be a mild night," Murray said. He predicted lows in the mid-50s for eastern Suffolk and upper 50s in the west and throughout Nassau County.

Look for a similar day on Monday with highs in the upper 70s for Nassau County and mid- to upper 70s on the East End.

"On Monday there'll be more clouds. We'll still have a mild day and there'll be dry weather conditions," Murray said. Winds continue out of the southwest at 10 to 15 miles per hour but will gust in the afternoon to 25 miles per hour. Lows will be in the upper 50s and low 60s.

"The air mass continues to build in warmer air," Murray said. "It will be more humid with the humidity consistently going up as we go into the week."

Upper 70s and lower 80s are expected for Tuesday for the immediate shore line with temperatures more in the mid 70s toward the coast.

@Newsday

"Interior portions and the northern half will have warmer, lower 80 readings," Murray said. "It'll be mostly sunny conditions with winds out of the southwest again at 10 to 15 miles per hour and gusting to 25. We're expecting the weather to remain dry."

Lows Tuesday night will be in the low to mid-60s though the Twin Forks and Nassau County are expected to be in the lower 60s with low to mid 60s in western Suffolk.

Rain could come in on Wednesday when highs are expected to be in the upper 70s to near 80 and lows will be in the mid-60s.

"There's a slight chance of showers and thunderstorms in the afternoon and night -- it's around 20 percent, but they're not going to be all day," Murray said.

On Thursday there will be patchy fog in the morning, and it will be a few degrees cooler with highs in the mid to generally in the upper 70s, although Nassau temperatures will be around 80 with the lower 70s along the coast. There's also another slight chance of showers and thunderstorms during the day. Lows will be in the 60s on average.

advertisement | advertise on newsday

Friday will be the same for highs and lows as on Thursday, Murray said. "It will be well into the 70s and the northern parts of Nassau will be around 80.

Murray said normal highs for this time of year are in the 70s with lows in the lower 50s.

"We're in the last spring period here before the summer season officially starts toward," Murray said.

For those going out on the water Sunday and Monday, National Weather Service meteorologist Peter Wichnowski said that on Sunday southwest winds over the water will be increasing to 15 to 20 knots in the afternoon and seas will be two to four feet in the bays.

"It'll be a little choppy, but short of a small craft advisory," Wichrowski said. "Large boats shouldn't have an issue. Ideal conditions would be lower winds and lower seas."