Long Island (NY)
September
Weather in Long Island, New York for September 2026
Your guide to Long Island weather in September - trends and predictions
In general, the average temperature in Long Island at the beginning of September is 23 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 22 °C by the end of September.
Long Island experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 122.9 mm.
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Temperatures
Rain 🌧️
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20
Dry days
10
Rainy days
0
Snow days
22°/17°
Temperatures
18 km/h
Avg max wind
74 %
Avg humidity
Long Island Weather September
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Temperatures trend during September in Long Island
See the weather trend as well as the moving average line
September weather in Long Island day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate rain at times | 25° /19° | 0.7 mm | 6 | |
| Sept. 2 |  Partly cloudy | 25° /17° | 0 mm | 7 | |
| Sept. 3 |  Sunny | 22° /15° | 0 mm | 6 | |
| Sept. 4 | Sunny | 21° /15° | 0 mm | 5 | |
| Sept. 5 | Sunny | 24° /17° | 15.2 mm | 6 | |
| Sept. 6 |  Patchy rain possible | 24° /19° | 0.2 mm | 6 | |
| Sept. 7 | Moderate or heavy rain shower | 20° /16° | 7.8 mm | 5 | |
| Sept. 8 | Sunny | 22° /13° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 23° /15° | 0 mm | 6 | |
| Sept. 10 | Sunny | 22° /16° | 0 mm | 6 | |
| Sept. 11 | Partly cloudy | 23° /15° | 0 mm | 6 | |
| Sept. 12 | Sunny | 23° /16° | 0 mm | 6 | |
| Sept. 13 | Sunny | 23° /16° | 0 mm | 6 | |
| Sept. 14 | Patchy rain possible | 26° /18° | 0.1 mm | 6 | |
| Sept. 15 | Partly cloudy | 24° /17° | 0 mm | 6 | |
| Sept. 16 | Partly cloudy | 21° /15° | 0 mm | 6 | |
| Sept. 17 |  Overcast | 20° /15° | 4.4 mm | 5 | |
| Sept. 18 | Overcast | 23° /17° | 56.7 mm | 5 | |
| Sept. 19 | Moderate or heavy rain shower | 26° /18° | 5 mm | 6 | |
| Sept. 20 | Patchy rain possible | 21° /16° | 0.1 mm | 5 | |
| Sept. 21 | Sunny | 21° /15° | 0 mm | 5 | |
| Sept. 22 | Partly cloudy | 20° /16° | 0 mm | 5 | |
| Sept. 23 |  Cloudy | 23° /16° | 0 mm | 6 | |
| Sept. 24 | Patchy rain possible | 22° /17° | 0.1 mm | 5 | |
| Sept. 25 | Overcast | 20° /18° | 3 mm | 5 | |
| Sept. 26 |  Heavy rain at times | 25° /18° | 18.3 mm | 6 | |
| Sept. 27 | Overcast | 22° /17° | 2.3 mm | 6 | |
| Sept. 28 | Heavy rain at times | 23° /17° | 7.6 mm | 5 | |
| Sept. 29 | Patchy rain possible | 21° /17° | 1.4 mm | 5 | |
| Sept. 30 | Overcast | 21° /16° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Long Island in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Long Island forecast closer to your planned date for the most up-to-date weather information.
Change Month
Long Island in September - FAQ
What are the expected maximum and minimum temperatures in Long Island during September?
During September, expect a variety of temperatures with highs around 22° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Long Island during September?
Significant rainfall exceeding 122.9 mm is expected in Long Island during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Long Island during September?
The average wind speed in Long Island during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Long Island
Explore the daily rainfall trends and prepare for Long Islands September weather 💧
Typically, Long Island has 10 rainy days in September with a total of 122.9 mm of rainfall.
UV exposure in Long Island during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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