Long Island (NY)
September
Weather in Long Island, New York for September 2027
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 24.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °C by the end of September.
Long Island experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 178.5 mm.
Is September a good time to visit Long Island? check out the best time to travel to Long Island page.
✨ Is September a good time to visit Long Island? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
21
Dry days
9
Rainy days
0
Snow days
22°/17°
Temperatures
19 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 | 26° /19° | 24 mm | 4 | |
| Sept. 2 |  Partly cloudy | 24° /17° | 0 mm | 5 | |
| Sept. 3 |  Light rain | 24° /16° | 8.6 mm | 4 | |
| Sept. 4 | Light rain | 24° /17° | 4 mm | 6 | |
| Sept. 5 | Moderate rain | 25° /17° | 11 mm | 7 | |
| Sept. 6 | Light rain | 24° /18° | 5.3 mm | 6 | |
| Sept. 7 |  Moderate or heavy rain shower | 22° /15° | 5.2 mm | 5 | |
| Sept. 8 |  Sunny | 24° /14° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 24° /16° | 0.2 mm | 4 | |
| Sept. 10 | Sunny | 25° /18° | 0.4 mm | 4 | |
| Sept. 11 | Partly cloudy | 24° /16° | 0 mm | 6 | |
| Sept. 12 | Sunny | 23° /16° | 0 mm | 6 | |
| Sept. 13 | Moderate rain | 23° /18° | 11.2 mm | 5 | |
| Sept. 14 |  Patchy rain possible | 25° /18° | 0.1 mm | 6 | |
| Sept. 15 | Partly cloudy | 22° /16° | 0 mm | 6 | |
| Sept. 16 | Partly cloudy | 21° /15° | 0 mm | 6 | |
| Sept. 17 | Light rain | 21° /17° | 2.9 mm | 5 | |
| Sept. 18 |  Heavy rain | 24° /19° | 37.8 mm | 5 | |
| Sept. 19 | Light rain | 24° /18° | 3.4 mm | 5 | |
| Sept. 20 | Patchy rain possible | 20° /17° | 2.2 mm | 3 | |
| Sept. 21 | Patchy rain possible | 20° /15° | 1.9 mm | 4 | |
| Sept. 22 | Partly cloudy | 19° /16° | 0.2 mm | 4 | |
| Sept. 23 |  Overcast | 21° /16° | 0 mm | 4 | |
| Sept. 24 | Patchy rain possible | 21° /16° | 0.1 mm | 4 | |
| Sept. 25 | Light rain | 20° /16° | 3.1 mm | 3 | |
| Sept. 26 |  Heavy rain at times | 22° /17° | 22.1 mm | 4 | |
| Sept. 27 | Moderate rain | 21° /16° | 22.8 mm | 4 | |
| Sept. 28 | Moderate rain | 20° /16° | 11 mm | 4 | |
| Sept. 29 | Patchy rain possible | 20° /16° | 1 mm | 3 | |
| Sept. 30 | Overcast | 20° /16° | 0 mm | 4 | |
| Next | |||||
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 178.5 mm is expected in Long Island during September, occurring over more than 9 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 19 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 9 rainy days in September with a total of 178.5 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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