Boston
September
Weather in Boston for September 2025
Your guide to Boston weather in September - trends and predictions
In general, the average temperature in Boston 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 Boston in September is notably wet, with an average of 11 rainy days.
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19
Dry days
11
Rainy days
0
Snow days
23°/15°
Temperatures
16 km/h
Avg max wind
76 %
Avg humidity
Boston in September average weather
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| 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° |
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Temperatures trend during September in Boston
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 | 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 | |
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Important Notice
Our weather forecast for Boston 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 Boston forecast closer to your planned date for the most up-to-date weather information.
Boston in September - FAQ
What are the expected maximum and minimum temperatures in Boston 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 Boston during September?
Significant rainfall exceeding 155.2 mm is expected in Boston during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Boston during September?
The average wind speed in Boston during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Boston
Explore the daily rainfall trends and prepare for Bostons September weather 💧
UV exposure in Boston during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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