Suffolk County (Boston)
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 24.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.1 °F by the end of September.
Suffolk County experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 168.2 mm.
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Temperatures
Rain 🌧️
More
9
Dry days
21
Rainy days
0
Snow days
22°/15°
Temperatures
16 km/h
Avg max wind
72 %
Avg humidity
Suffolk County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2  23° | 3  25° | 4 27° | 5  24° | 6 23° | 7  25° |
| 8 26° | 9 26° | 10 25° | 11 25° | 12 26° | 13 26° | 14 24° |
| 15 24° | 16  23° | 17 23° | 18 22° | 19 21° | 20 21° | 21 20° |
| 22 20° | 23 18° | 24 20° | 25  20° | 26 20° | 27 21° | 28  19° |
| 29 17° | 30 17° |
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Temperatures trend during September in Suffolk County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 25° /16° | 6.8 mm | 6 | |
| Sept. 2 | Moderate or heavy rain shower | 23° /14° | 11.5 mm | 5 | |
| Sept. 3 | Cloudy | 25° /14° | 0 mm | 6 | |
| Sept. 4 | Sunny | 27° /15° | 0 mm | 6 | |
| Sept. 5 | Overcast | 24° /15° | 6.2 mm | 6 | |
| Sept. 6 | Overcast | 23° /17° | 16.3 mm | 5 | |
| Sept. 7 | Partly cloudy | 25° /16° | 3.1 mm | 6 | |
| Sept. 8 | Sunny | 26° /15° | 0.1 mm | 7 | |
| Sept. 9 | Sunny | 26° /16° | 10.3 mm | 6 | |
| Sept. 10 | Sunny | 25° /16° | 5.1 mm | 6 | |
| Sept. 11 | Partly cloudy | 25° /15° | 1.2 mm | 6 | |
| Sept. 12 | Sunny | 26° /16° | 7.1 mm | 6 | |
| Sept. 13 | Overcast | 26° /17° | 3 mm | 6 | |
| Sept. 14 | Sunny | 24° /15° | 0 mm | 6 | |
| Sept. 15 | Overcast | 24° /14° | 0.1 mm | 6 | |
| Sept. 16 | Heavy rain at times | 23° /13° | 2.8 mm | 6 | |
| Sept. 17 | Partly cloudy | 23° /14° | 0.2 mm | 6 | |
| Sept. 18 | Overcast | 22° /16° | 5.9 mm | 5 | |
| Sept. 19 | Sunny | 21° /15° | 5.9 mm | 5 | |
| Sept. 20 | Sunny | 21° /14° | 8.7 mm | 5 | |
| Sept. 21 | Cloudy | 20° /12° | 7.2 mm | 5 | |
| Sept. 22 | Overcast | 20° /13° | 6.1 mm | 5 | |
| Sept. 23 | Overcast | 18° /14° | 12 mm | 5 | |
| Sept. 24 | Overcast | 20° /13° | 0.6 mm | 5 | |
| Sept. 25 | Patchy rain possible | 20° /12° | 8.8 mm | 5 | |
| Sept. 26 | Moderate or heavy rain shower | 20° /13° | 29.3 mm | 5 | |
| Sept. 27 | Overcast | 21° /12° | 6.1 mm | 5 | |
| Sept. 28 | Fog | 19° /12° | 3.6 mm | 4 | |
| Sept. 29 | Cloudy | 17° /12° | 0 mm | 4 | |
| Sept. 30 | Overcast | 17° /10° | 0.2 mm | 4 | |
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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 22° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Suffolk County during September?
Significant rainfall exceeding 168.2 mm is expected in Suffolk County during September, occurring over more than 21 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 ☀️
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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.
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