See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:40
Sunrise
18:53
Sunset
Moon
Waxing Crescent
12:32
Moonrise
20:57
Moonset
Daily Forecast
Today
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Air Quality Data Available
Upgrade to access real-time air quality data for Islip.
Resources
UV Index
Humidity
Weather in Islip today, September 16, 2026
Conditions in Islip on September 16, 2026 favour clear skies, so the day opens with a fine, sunny outlook. Any interruptions to the blue should be brief rather than lasting. The morning sky stays heavily clouded, with cover near 77% around 11:00. Grey conditions set the early tone before any later change.
Temperatures climb from an overnight low near 17°C toward a daytime high of about 22°C. Moisture in the air spans 66%-85%, with the highest values around 22:00. Expect gentle winds, highest near 14:00 at 6.2 km/h.
Expect persistent cloud later on, with amounts around 95% by 18:00. Sunshine remains the exception, not the rule. Visibility stays generally good near 16.1 km on average, though it can drop toward 15.9 km in thicker cloud or showers. Daylight runs from 06:40 to 18:53, lasting 12 hours 12 minutes of sunlight today.
The practical takeaway for Islip is a bright September 16, 2026, ideal for outdoor errands before temperatures ease from about 22°C.
Frequently asked questions about weather in Islip
How warm does it get in Islip?
The warmest month in Islip is July, with average high temperatures of 26°C. The average temperature during this period is around 24°C.
How cold does it get in Islip?
The coldest month in Islip is January, with average low temperatures of 0°C. The average temperature during this period is around 2°C.
What is the wettest time of year in Islip?
The wettest month in Islip is December, with an average of 133mm of precipitation.
What is the driest time of year in Islip?
The driest month in Islip is June, with an average of 74mm of precipitation.
Explore more weather forecasts
- East Islip, New York
- New York City, New York
- Bay Shore, New York
- Los Angeles, California
- North Bay Shore, New York
- Brooklyn, New York
- Brentwood, New York
- Chicago, Illinois
- Central Islip, New York
- Houston, Texas
- West Islip, New York
- Queens, New York
- Bohemia, New York
- Phoenix, Arizona
- North Babylon, New York
- Philadelphia, Pennsylvania
