News12 New York
N12 Originals
Numbers & Links
Local News
Crime
Weather
Politics
Clear
57°
Local News
Crime
Weather
Politics

Coolest air of the season arrives early this week across Long Island following Monday cold front

Rain gives way to clearing skies on Monday before gusty winds, rough surf, and October chills in the 50s move in through midweek.

Jonathan Cubit

•

Oct 4, 2026, 5:40 PM

•

Updated

Share:

More Stories

Islip Information

Islip Information

Islip, New York • Climate data: Islip MacArthur Airport (ISP)
Updating...
🌅
Sunrise
--
Islip
🌇
Sunset
--
Islip
☀️
UV Index Today
--
Loading...
🌙
Moon Phase
--
Tonight
🍃
Air Quality
--
Loading...
🌡️
Average High / Low
-- / --
1991-2020 Normals
ISP Climate
🏆
Record High / Low
-- / --
Loading...
ISP Climate
Loading latest Islip information...

What to expect:

  • Sunday evening will be cloudy and damp, with periods of rain but heavy rain and flooding are not expected.

  • Monday begins unsettled before conditions improve, followed by a reinforcing cold front.

  • The coolest air of the season arrives Monday night into Tuesday, with highs struggling to reach 60 in many areas.

  • Tuesday and Wednesday look crisp, breezy and dry.

Forecast

Sunday night remains cloudy and damp, with periods of rain, though heavy rainfall and localized flooding are not expected. Settled conditions return as damp weather improves on Monday before a reinforcing cold front moves across the region, sweeping through Long Island and ushering in a much colder Canadian air mass. Behind this frontal boundary, strong northwest winds will increase Monday night into Tuesday, creating breezy conditions on land and rough waters offshore where the National Weather Service indicates Small Craft Advisory conditions are likely on the ocean and possible for surrounding coastal waters.

Tuesday marks the arrival of the season's coolest air so far, with afternoon temperatures struggling to break out of the upper 50s and low 60s while nighttime lows drop sharply into the 40s. A crisp, breezy and dry fall pattern continues through Wednesday before temperatures begin a gradual recovery later in the week.

Overall Trend

The main story is the transition to a much more fall-like pattern. Monday is transitional while Tuesday and Wednesday bring the coolest, driest air of the season so far. Temperatures should gradually begin recovering later in the week.

F_P2_AM_1.png  LI.png
RG_F_10DAY_icast_PM.png

More From News12

App StoreGoogle Play Store

info

Newsletter

Send Photos/Videos

Contact

About Us

News Team

News 12 New York

follow us

Twitter

Facebook

Instagram

more resources

Optimum Corporate

Optimum Service

Advertise on News 12

Careers

Content Removal Policy

© 2026 N12N, LLC

Privacy Policy

Terms of Service

Ad Choices