Nassau County (Glen Cove)
September
Weather in Nassau County, New York for September 2026
Your guide to Nassau County weather in September - trends and predictions
So far, September 2026 in Nassau County is slightly warmer than the historical average by 1.9 °F.
Expect cooler weather in the next days in Nassau County with the forecast suggesting a temperature of 23.1 °F, lower than the historical average.
In general, the average temperature in Nassau County at the beginning of September is 25.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 23.7 °F by the end of September.
Nassau County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 206.3 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
22°/18°
Temperatures
16 km/h
Avg max wind
76 %
Avg humidity
Nassau County Weather September
Move between months or click on a day
Temperatures trend during September in Nassau County
See the weather trend as well as the moving average line
September weather in Nassau County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 26° /19° | 147.5 mm | 4 | |
| Sept. 2 |  Sunny | 24° /18° | 0.1 mm | 4 | |
| Sept. 3 |  Fog | 26° /17° | 1.1 mm | 3 | |
| Sept. 4 | Mist | 26° /19° | 2.4 mm | 7 | |
| Sept. 5 |  Heavy rain | 28° /19° | 19.8 mm | 7 | |
| Sept. 6 |  Moderate or heavy rain shower | 25° /18° | 23.4 mm | 7 | |
| Sept. 7 |  Light rain shower | 23° /14° | 24 mm | 6 | |
| Sept. 8 | Fog | 26° /14° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 25° /16° | 0.2 mm | 4 | |
| Sept. 10 | Overcast | 25° /18° | 0.3 mm | 3 | |
| Sept. 11 | Sunny | 27° /18° | 0 mm | 7 | |
| Sept. 12 | Partly cloudy | 25° /17° | 0 mm | 6 | |
| Sept. 13 | Partly cloudy | 24° /19° | 37.4 mm | 4 | |
| Sept. 14 |  Cloudy | 24° /18° | 0 mm | 6 | |
| Sept. 15 | Mist | 22° /17° | 0 mm | 6 | |
| Sept. 16 | Fog | 23° /17° | 0 mm | 6 | |
| Sept. 17 | Sunny | 28° /22° | 1.9 mm | 7 | |
| Sept. 18 | Partly cloudy | 29° /22° | 0 mm | 7 | |
| Sept. 19 | Overcast | 22° /16° | 0 mm | 5 | |
| Sept. 20 | Light rain shower | 24° /17° | 6.8 mm | 5 | |
| Sept. 21 | Overcast | 19° /14° | 1.6 mm | 5 | |
| Sept. 22 | Light rain shower | 18° /15° | 5.6 mm | 4 | |
| Sept. 23 | Patchy rain possible | 18° /16° | 9.5 mm | 4 | |
| Sept. 24 | Overcast | 24° /16° | 1.6 mm | 5 | |
| Sept. 25 | Sunny | 21° /14° | 11.9 mm | 6 | |
| Sept. 26 | Sunny | 18° /13° | 0 mm | 5 | |
| Sept. 27 | Sunny | 24° /13° | 0 mm | 6 | |
| Sept. 28 | Sunny | 25° /17° | 0 mm | 7 | |
| Sept. 29 | Sunny | 27° /18° | 0 mm | 7 | |
| Sept. 30 | Sunny | 27° /19° | 0 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Nassau County 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 Nassau County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Nassau County in September - FAQ
What are the expected maximum and minimum temperatures in Nassau County during September?
During September, expect a variety of temperatures with highs around 22° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Nassau County during September?
Significant rainfall exceeding 206.3 mm is expected in Nassau County during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Nassau County during September?
The average wind speed in Nassau County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Nassau County
Explore the daily rainfall trends and prepare for Nassau Countys September weather 💧
Typically, Nassau County has 8 rainy days in September with a total of 206.3 mm of rainfall.
UV exposure in Nassau County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Nassau County
Select a location for an accurate weather forecast
More Locations Quick links
More Nassau County weather pages
You are here
Where is Nassau County?Get accurate weather forecasts for Nassau County, located at latitude 40.862 and longitude -73.634. Stay updated with localized weather information tailored for Nassau County.
Found a mistake?
We appreciate your attention to details. Tell us here.