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Beautiful evening on Long Island ahead of a big temperature swing this week

Warmer temperatures move in midweek, but rain showers and windier weather Friday will transition Nassau and Suffolk Counties to a much colder feel to start the weekend.

Matt Hammer

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Oct 12, 2026, 3:48 PM

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Islip Information

Islip Information

Islip, New York • Climate data: Islip MacArthur Airport (ISP)
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THIS EVENING

After a gorgeous, fairly seasonable Monday afternoon, the weather remains mostly nice and comfortable this evening. It is mostly clear to partly cloudy with a light breeze and temperatures that are cooling down into the upper 50s to lower 60s from highs that were around the upper 60s to near 70 degrees this afternoon. There can be some patchy fog developing during the evening, but otherwise it will stay nice.

OVERNIGHT

Partly cloudy with areas of patchy fog. Comfortable with low temperatures in the mid-50s into early Tuesday morning. The wind overnight will stay light out of the northwest around 5 to 10 mph - that is a light, refreshing breeze.

MIDWEEK WARM-UP

It will feel closer to summer midweek on Wednesday. High temperatures will be warm - well into the 70s and parts of Long Island can touch 80 degrees. As with any warm-up like this during fall, it is typically short-lived, which will be the case this week. Outdoor plans are a go as well Tuesday through Thursday. Tuesday and Thursday just won't be as warm as Wednesday, but still nice with highs in the upper 60s to lower 70s.

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FRIDAY SHOWERS LEAD TO A COLDER WEEKEND

A cold front will bring periods of rain showers and windier conditions on Friday, but it will also lead to some of our coldest-feeling daytime air of the season yet! You may need to have a winter coat with you all day on Saturday. It will be dry and windy on Saturday, but highs will only be around the lower 50s and that wind will be a colder northwest wind. So, it can feel like the upper 30s to at best the lower 40s all day on Saturday. It won't last long, though! Temperatures will rebound back into the 60s with lighter wind into next week.

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EXTENDED FORECAST

TONIGHT: Partly cloudy with areas of patchy fog. Comfortable with lows in the mid-50s into early Tuesday morning. Wind: Northwest 5 to 10 mph.

TUESDAY: A mix of sun and clouds. Highs will be around the upper 60s to lower 70s. Wind: East to south around 5 to 15 mph. Lows near 62 degrees.

WEDNESDAY: Sun and clouds. Warmer with highs in the mid-to-upper 70s for most of Long Island. Lows near 56 degrees.

THURSDAY: Sun and clouds. Highs around 66 degrees. Lows near 53 degrees.

FRIDAY: Mostly cloudy with periods of rain showers. Windier with some gusts around 20 to 30 mph. Highs near 70 degrees. Lows near 45 degrees.

SATURDAY: COLDER - Sun and clouds. Windy, much colder feeling and dry. Highs around 52 degrees will mostly feel like the upper 30s to mid-40s at best. Wind gusts may get to the 30 to 40 mph range. Lows near 38 degrees.

SUNDAY: Mostly sunny with highs around 56 degrees. Lows near 42 degrees.

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