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United Kingdom weather

Weather in Boston for September 2026

Your guide to Boston weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Boston at the beginning of September is 20.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.4 °C by the end of September.

    • Rain 🌧️

  • The climate of Boston in September is notably wet, with an average of 14 rainy days, and a total of 58.5 mm of precipitation.

    • More

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Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/11°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Boston Weather September

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

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
1 Sept. Patchy rain possible
Patchy rain possible
 21° /14° 0.2 mm 5
2 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 1.1 mm 5
3 Sept. Moderate rain at times
Moderate rain at times
 20° /13° 4.5 mm 5
4 Sept. Patchy rain possible
Patchy rain possible
 17° /11° 3.5 mm 4
5 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 0.2 mm 5
6 Sept. Partly cloudy
Partly cloudy
 22° /14° 0 mm 6
7 Sept. Heavy rain at times
Heavy rain at times
 23° /15° 1.4 mm 5
8 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 21° /13° 2.5 mm 6
9 Sept. Moderate rain at times
Moderate rain at times
 19° /10° 0.3 mm 5
10 Sept. Heavy rain at times
Heavy rain at times
 19° /10° 2.6 mm 5
11 Sept. Patchy rain possible
Patchy rain possible
 17° /8° 0.4 mm 4
12 Sept. Patchy rain possible
Patchy rain possible
 16° /7° 0.2 mm 4
13 Sept. Cloudy
Cloudy
 17° /8° 0.2 mm 4
14 Sept. Partly cloudy
Partly cloudy
 17° /7° 3.6 mm 5
15 Sept. Heavy rain at times
Heavy rain at times
 19° /11° 2 mm 5
16 Sept. Partly cloudy
Partly cloudy
 17° /10° 0.1 mm 5
17 Sept. Sunny
Sunny
 18° /10° 5.9 mm 5
18 Sept. Partly cloudy
Partly cloudy
 21° /14° 0 mm 5
19 Sept. Partly cloudy
Partly cloudy
 22° /14° 0 mm 6
20 Sept. Patchy rain possible
Patchy rain possible
 21° /13° 0.1 mm 5
21 Sept. Overcast
Overcast
 17° /11° 0 mm 4
22 Sept. Overcast
Overcast
 17° /11° 0.1 mm 4
23 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 16° /9° 8 mm 4
24 Sept. Overcast
Overcast
 16° /9° 0.2 mm 4
25 Sept. Heavy rain at times
Heavy rain at times
 16° /10° 5.6 mm 4
26 Sept. Moderate rain at times
Moderate rain at times
 16° /11° 1.5 mm 4
27 Sept. Heavy rain at times
Heavy rain at times
 15° /7° 4.8 mm 4
28 Sept. Overcast
Overcast
 15° /7° 0.3 mm 4
29 Sept. Overcast
Overcast
 15° /7° 0.3 mm 4
30 Sept. Moderate rain
Moderate rain
 15° /10° 9 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.
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Boston in September - FAQ

What are the expected maximum and minimum temperatures in Boston during September?

Enjoy moderate daytime temperatures of up to 18° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Boston during September?

Moderate rainfall is anticipated in Boston during September, with a total of 58.5 mm spread over approximately 14 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Boston during September?

The average wind speed in Boston during September is 24 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 💧
Typically, Boston has 14 rainy days in September with a total of 58.5 mm of rainfall.

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 52.976 and longitude -0.027. Stay updated with localized weather information tailored for Boston.

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