Suffolk County
September
Weather in Suffolk County for September 2025
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 25.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.6 °F by the end of September.
The climate of Suffolk County in September is notably wet, with an average of 11 rainy days.
- New! Chat with our AI weatherman - it’s amazing and free.
19
Dry days
11
Rainy days
0
Snow days
23°/15°
Temperatures
16 km/h
Avg max wind
76 %
Avg humidity
Suffolk County in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2  26° | 3  26° | 4  26° | 5 26° | 6  24° | 7  27° |
| 8 26° | 9  26° | 10 26° | 11  24° | 12  24° | 13  26° | 14 23° |
| 15 21° | 16  23° | 17 24° | 18 19° | 19 20° | 20 21° | 21 19° |
| 22 18° | 23 16° | 24 17° | 25  17° | 26 17° | 27 20° | 28 18° |
| 29 16° | 30 18° |
You can click on date
Access Suffolk County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Suffolk County
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 24° /15° | 5.5 mm | 6 | |
| Sept. 2 | Overcast | 26° /14° | 0 mm | 6 | |
| Sept. 3 | Partly cloudy | 26° /14° | 0 mm | 7 | |
| Sept. 4 | Mist | 26° /15° | 0 mm | 6 | |
| Sept. 5 | Fog | 26° /15° | 0 mm | 6 | |
| Sept. 6 | Cloudy | 24° /18° | 0.1 mm | 6 | |
| Sept. 7 | Thundery outbreaks possible | 27° /17° | 5.9 mm | 6 | |
| Sept. 8 | Mist | 26° /15° | 0.3 mm | 7 | |
| Sept. 9 | Patchy light rain with thunder | 26° /17° | 3.6 mm | 6 | |
| Sept. 10 | Patchy light rain with thunder | 26° /17° | 4.1 mm | 6 | |
| Sept. 11 | Light rain shower | 24° /15° | 2 mm | 6 | |
| Sept. 12 | Moderate or heavy rain shower | 24° /16° | 10.9 mm | 6 | |
| Sept. 13 | Moderate rain | 26° /17° | 3.8 mm | 6 | |
| Sept. 14 | Overcast | 23° /16° | 0 mm | 6 | |
| Sept. 15 | Overcast | 21° /14° | 0 mm | 5 | |
| Sept. 16 | Light rain | 23° /13° | 1.2 mm | 6 | |
| Sept. 17 | Partly cloudy | 24° /13° | 0 mm | 6 | |
| Sept. 18 | Moderate rain | 19° /15° | 11.9 mm | 4 | |
| Sept. 19 | Cloudy | 20° /15° | 10.6 mm | 5 | |
| Sept. 20 | Sunny | 21° /14° | 17 mm | 5 | |
| Sept. 21 | Cloudy | 19° /13° | 14.2 mm | 5 | |
| Sept. 22 | Fog | 18° /12° | 0 mm | 4 | |
| Sept. 23 | Moderate rain | 16° /13° | 23.9 mm | 4 | |
| Sept. 24 | Overcast | 17° /13° | 0 mm | 4 | |
| Sept. 25 | Heavy rain | 17° /13° | 14.1 mm | 4 | |
| Sept. 26 | Patchy rain possible | 17° /12° | 46.6 mm | 4 | |
| Sept. 27 | Mist | 20° /12° | 12.1 mm | 5 | |
| Sept. 28 | Fog | 18° /11° | 0 mm | 4 | |
| Sept. 29 | Fog | 16° /12° | 0 mm | 4 | |
| Sept. 30 | Overcast | 18° /11° | 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.
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 23° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Suffolk County during September?
Significant rainfall exceeding 155.2 mm is expected in Suffolk County during September, occurring over more than 11 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 16 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 💧
UV exposure in Suffolk County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Suffolk County
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Suffolk County?Get accurate weather forecasts for Suffolk County, located at latitude 42.358 and longitude -71.06. Stay updated with localized weather information tailored for Suffolk County.
Found a mistake?
We appreciate your attention to details. Tell us here.