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
In general, the average temperature in Nassau County at the beginning of September is 23.1 °F. As the month progressed, temperatures tended to slightly increase, reaching an average of 23.3 °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.
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Temperatures
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
22°/18°
Temperatures
16 km/h
Avg max wind
77 %
Avg humidity
Nassau County Weather September
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Temperatures trend during September in Nassau County
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September weather in Nassau County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 23° /19° | 0 mm | 5 | |
| Sept. 2 |  Sunny | 26° /18° | 0 mm | 7 | |
| Sept. 3 |  Fog | 23° /16° | 0 mm | 5 | |
| Sept. 4 | Mist | 22° /17° | 0 mm | 5 | |
| Sept. 5 |  Heavy rain | 27° /20° | 39.5 mm | 6 | |
| Sept. 6 |  Moderate or heavy rain shower | 24° /21° | 46.7 mm | 5 | |
| Sept. 7 |  Light rain shower | 17° /15° | 48 mm | 4 | |
| Sept. 8 | Fog | 23° /13° | 0 mm | 5 | |
| Sept. 9 |  Partly cloudy | 21° /16° | 0 mm | 6 | |
| Sept. 10 | Overcast | 19° /16° | 0 mm | 4 | |
| Sept. 11 | Sunny | 26° /17° | 0 mm | 7 | |
| Sept. 12 | Partly cloudy | 22° /19° | 0 mm | 6 | |
| Sept. 13 | Partly cloudy | 22° /18° | 0 mm | 6 | |
| Sept. 14 |  Cloudy | 24° /19° | 0 mm | 5 | |
| Sept. 15 | Mist | 22° /19° | 0 mm | 5 | |
| Sept. 16 | Fog | 20° /17° | 0 mm | 5 | |
| Sept. 17 | Overcast | 18° /17° | 0 mm | 4 | |
| Sept. 18 | Light rain shower | 24° /19° | 8 mm | 5 | |
| Sept. 19 | Partly cloudy | 25° /20° | 0 mm | 7 | |
| Sept. 20 | Partly cloudy | 19° /15° | 0 mm | 5 | |
| Sept. 21 | Overcast | 18° /15° | 0 mm | 4 | |
| Sept. 22 |  Light rain | 21° /16° | 3.7 mm | 5 | |
| Sept. 23 | Cloudy | 24° /19° | 0 mm | 5 | |
| Sept. 24 | Mist | 22° /19° | 3.6 mm | 5 | |
| Sept. 25 | Light rain shower | 22° /20° | 13.7 mm | 5 | |
| Sept. 26 | Partly cloudy | 25° /20° | 0 mm | 7 | |
| Sept. 27 | Partly cloudy | 24° /18° | 0 mm | 6 | |
| Sept. 28 | Heavy rain | 24° /19° | 43.1 mm | 5 | |
| Sept. 29 | Mist | 23° /17° | 0 mm | 5 | |
| Sept. 30 | Overcast | 23° /19° | 0 mm | 5 | |
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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 💧
UV exposure in Nassau County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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