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United States weather

Weather in Boston, Massachusetts for September 2025

Your guide to Boston weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Boston 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 Boston with the forecast suggesting a temperature of 21.5 °F, lower than the historical average.

  • In general, the average temperature in Boston at the beginning of September is 24.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.3 °F by the end of September.

    • Rain 🌧️

  • Boston experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 168.2 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
9
Dry days
Average rainy days
21
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/15°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
72 %
Avg humidity

Boston Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
24°
2
Moderate or heavy rain shower
23°
3
Partly cloudy
25°
4
Sunny
26°
5
Overcast
24°
6
Overcast
24°
7
Partly cloudy
24°
8
Sunny
26°
9
Sunny
25°
10
Sunny
24°
11
Sunny
25°
12
Sunny
25°
13
Overcast
25°
14
Partly cloudy
27°
15
Partly cloudy
21°
16
Overcast
21°
17
Sunny
24°
18
Patchy rain possible
21°
19
Sunny
30°
20
Moderate rain
18°
21
Patchy rain possible
15°
22
Cloudy
16°
23
Partly cloudy
19°
24
Cloudy
23°
25
Sunny
24°
26
Partly cloudy
21°
27
Overcast
21°
28
Fog
19°
29
Cloudy
17°
30
Overcast
17°

Temperatures trend during September in Boston

See the weather trend as well as the moving average line

September weather in Boston day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 24° /16° 5.4 mm 6
Sept. 2 Moderate or heavy rain shower
Moderate or heavy rain shower
 23° /14° 9.2 mm 5
Sept. 3 Partly cloudy
Partly cloudy
 25° /14° 0 mm 6
Sept. 4 Sunny
Sunny
 26° /14° 0 mm 6
Sept. 5 Overcast
Overcast
 24° /15° 6.1 mm 6
Sept. 6 Overcast
Overcast
 24° /18° 13.1 mm 5
Sept. 7 Partly cloudy
Partly cloudy
 24° /15° 7.5 mm 6
Sept. 8 Sunny
Sunny
 26° /15° 0.1 mm 6
Sept. 9 Sunny
Sunny
 25° /16° 8.2 mm 6
Sept. 10 Sunny
Sunny
 24° /16° 4.1 mm 6
Sept. 11 Sunny
Sunny
 25° /14° 0.9 mm 6
Sept. 12 Sunny
Sunny
 25° /16° 5.7 mm 6
Sept. 13 Overcast
Overcast
 25° /17° 2.4 mm 6
Sept. 14 Partly cloudy
Partly cloudy
 27° /17° 0 mm 1.2
Sept. 15 Partly cloudy
Partly cloudy
 21° /16° 0 mm 1.4
Sept. 16 Overcast
Overcast
 21° /14° 0 mm 1.4
Sept. 17 Sunny
Sunny
 24° /14° 0 mm 1.1
Sept. 18 Patchy rain possible
Patchy rain possible
 21° /16° 0.4 mm 0
Sept. 19 Sunny
Sunny
 30° /17° 0 mm 6
Sept. 20 Moderate rain
Moderate rain
 18° /10° 10.2 mm 4
Sept. 21 Patchy rain possible
Patchy rain possible
 15° /11° 0.1 mm 3
Sept. 22 Cloudy
Cloudy
 16° /11° 0 mm 3
Sept. 23 Partly cloudy
Partly cloudy
 19° /12° 0 mm 5
Sept. 24 Cloudy
Cloudy
 23° /13° 0 mm 4
Sept. 25 Sunny
Sunny
 24° /16° 0 mm 6
Sept. 26 Partly cloudy
Partly cloudy
 21° /12° 0 mm 5
Sept. 27 Overcast
Overcast
 21° /12° 6.1 mm 5
Sept. 28 Fog
Fog
 19° /12° 3.6 mm 4
Sept. 29 Cloudy
Cloudy
 17° /12° 0 mm 4
Sept. 30 Overcast
Overcast
 17° /10° 0.2 mm 4
Next
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.
Change Month
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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 22° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Boston during September?
Significant rainfall exceeding 168.2 mm is expected in Boston during September, occurring over more than 21 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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Get accurate weather forecasts for Boston, located at latitude 42.358 and longitude -71.06. Stay updated with localized weather information tailored for Boston.

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