Weather in Suffolk County, Massachusetts for September 2025
Until now, September 2025 in Suffolk County is cooler than usual, with temperatures averaging 21.8 °F, this is -2.8 °F below the typical seasonal average.
Expect cooler weather in the next days in Suffolk County with the forecast suggesting a temperature of 22.9 °F, lower than the historical average.
In general, the average temperature in Suffolk County at the beginning of September is 24.3 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 21.3 °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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Suffolk County Weather September
Temperatures trend during September in Suffolk County
September weather in Suffolk County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 24° /16° | 5.4 mm | 6 | |
| Sept. 2 |  Moderate or heavy rain shower | 23° /14° | 9.2 mm | 5 | |
| Sept. 3 |  Partly cloudy | 25° /14° | 0 mm | 6 | |
| Sept. 4 | Sunny | 26° /14° | 0 mm | 6 | |
| Sept. 5 |  Overcast | 24° /15° | 6.1 mm | 6 | |
| Sept. 6 | Overcast | 24° /18° | 13.1 mm | 5 | |
| Sept. 7 | Partly cloudy | 24° /15° | 7.5 mm | 6 | |
| Sept. 8 | Sunny | 26° /15° | 0.1 mm | 6 | |
| Sept. 9 | Sunny | 25° /16° | 8.2 mm | 6 | |
| Sept. 10 | Sunny | 24° /16° | 4.1 mm | 6 | |
| Sept. 11 | Sunny | 25° /14° | 0.9 mm | 6 | |
| Sept. 12 | Sunny | 25° /16° | 5.7 mm | 6 | |
| Sept. 13 | Overcast | 25° /17° | 2.4 mm | 6 | |
| Sept. 14 |  Cloudy | 24° /15° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 21° /15° | 0 mm | 1.4 | |
| Sept. 16 |  Mist | 18° /13° | 0 mm | 1.4 | |
| Sept. 17 | Mist | 20° /12° | 0 mm | 1.1 | |
| Sept. 18 | Partly cloudy | 28° /15° | 0 mm | 1.3 | |
| Sept. 19 | Sunny | 26° /16° | 0 mm | 0 | |
| Sept. 20 | Sunny | 18° /11° | 0 mm | 4 | |
| Sept. 21 | Sunny | 23° /9° | 0 mm | 5 | |
| Sept. 22 | Sunny | 25° /11° | 0 mm | 5 | |
| Sept. 23 | Sunny | 26° /13° | 0 mm | 5 | |
| Sept. 24 |  Patchy rain possible | 24° /16° | 0.9 mm | 4 | |
| Sept. 25 | Patchy rain possible | 21° /16° | 0.3 mm | 4 | |
| Sept. 26 | Partly cloudy | 21° /15° | 0 mm | 5 | |
| Sept. 27 | Sunny | 29° /14° | 0 mm | 6 | |
| Sept. 28 | Sunny | 20° /14° | 0 mm | 5 | |
| Sept. 29 | Cloudy | 17° /12° | 0 mm | 4 | |
| Sept. 30 | Overcast | 17° /10° | 0.2 mm | 4 | |
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Suffolk County in September - FAQ
September rainfall patterns in Suffolk County
UV exposure in Suffolk County during 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.