THINGS TO DO · YOUTUBE SHORT
Heckscher State Park, East Islip, NY, US - Part 1
A local activity video shared by OurTrip Videos.
Watch on YouTube ↗
Weather · September
Islip weather in September
Average highs of 75°F, lows of 59°F and 3.6 in of rain, from 30 years of weather records.
September is Islip’s 4th warmest month, with average highs of 75°F and lows of 59°F. That is 7° cooler than August, and 14° above the yearly average high.
- Average high
- 75°F
- Average low
- 59°F
- Precipitation
- 3.6 in
- Wet days
- 9
- Sunrise · sunset
- 6:33 AM · 7:03 PM
September across the year
High and low Rain
What to wear in September
- Mild days: dress in layers, with a light jacket or sweater for mornings and evenings.
- Pack an umbrella or rain jacket: rain or snow falls on about 9 days this month.
September is good for
What’s on in Islip in September
See all upcoming events and school days off.
Around Islip
See Islip
A look around town before you go.
THINGS TO DO · YOUTUBE SHORT
Living Large: Islip
A local activity video shared by CBS New York.
Watch on YouTube ↗September compared with the months around it
Planning a trip? See the best time to visit Islip and today’s forecast.
Questions
How hot does it get in Islip in September?
Average highs are 75°F and average lows 59°F, for a daily mean of 67°F. Individual days run hotter or colder than these 30-year averages.
Does it rain in Islip in September?
September averages 3.6 in of precipitation over about 9 days with at least 0.01 in. It is the 8th wettest month of the year.
What time is sunset in Islip in September?
Around mid-September the sun rises about 6:33 AM and sets about 7:03 PM, for roughly 12.5 hours of daylight.
Is September a good time to visit Islip?
Yes. September is one of the mildest months, with highs between 65°F and 85°F and little rain.
NOAA U.S. Climate Normals 1991–2020, Islip Li Macarthur Ap station (9.7 mi from downtown). Sunrise and sunset are calculated for September 15 at the city’s coordinates.