Suffolk County (Long Island)
September
Weather in Suffolk County, New York for September 2027
Your guide to Suffolk County weather in September - trends and predictions
In general, the average temperature in Suffolk County 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.
Suffolk County 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 Suffolk County? check out the best time to travel to Suffolk County page.
✨ Is September a good time to visit Suffolk County? – 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
Suffolk County Weather September
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Temperatures trend during September in Suffolk County
See the weather trend as well as the moving average line
September weather in Suffolk County 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 Suffolk 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 Suffolk County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Suffolk County in September - FAQ
What are the expected maximum and minimum temperatures in Suffolk County 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 Suffolk County during September?
Significant rainfall exceeding 178.5 mm is expected in Suffolk County during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Suffolk County during September?
The average wind speed in Suffolk County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Suffolk County
Explore the daily rainfall trends and prepare for Suffolk Countys September weather 💧
Typically, Suffolk County has 9 rainy days in September with a total of 178.5 mm of rainfall.
UV exposure in Suffolk County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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