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Weather in Boston for September 2025

Your guide to Boston weather in September - trends and predictions

    Temperatures

  • The forecast for the first days of September 2025 in Boston predicts a temperature of 20.8 °C, which is slightly above the historical average.

  • In general, the average temperature in Boston at the beginning of September is 19.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.1 °C by the end of September.

  • Rain 🌧️

  • Boston in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 81 mm.

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Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/11°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Boston Weather September

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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
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
17° /11° 0.1 mm 3
2 Sept. Patchy rain possible
Patchy rain possible
22° /10° 0.1 mm 4
3 Sept. Patchy rain possible
Patchy rain possible
19° /12° 3.9 mm 3
4 Sept. Patchy rain possible
Patchy rain possible
20° /11° 0.6 mm 3
5 Sept. Patchy rain possible
Patchy rain possible
19° /12° 0.5 mm 3
6 Sept. Partly cloudy
Partly cloudy
19° /9° 0 mm 4
7 Sept. Patchy rain possible
Patchy rain possible
20° /13° 0.1 mm 4
8 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
20° /14° 5 mm 5
9 Sept. Moderate rain at times
Moderate rain at times
16° /11° 0.6 mm 4
10 Sept. Heavy rain at times
Heavy rain at times
17° /8° 3.7 mm 4
11 Sept. Patchy rain possible
Patchy rain possible
14° /7° 0.5 mm 3
12 Sept. Patchy rain possible
Patchy rain possible
13° /5° 0.3 mm 3
13 Sept. Cloudy
Cloudy
15° /6° 0 mm 4
14 Sept. Partly cloudy
Partly cloudy
17° /7° 0 mm 5
15 Sept. Heavy rain at times
Heavy rain at times
20° /10° 3.2 mm 5
16 Sept. Partly cloudy
Partly cloudy
17° /9° 0 mm 5
17 Sept. Sunny
Sunny
17° /9° 0 mm 5
18 Sept. Partly cloudy
Partly cloudy
18° /12° 0 mm 5
19 Sept. Partly cloudy
Partly cloudy
20° /13° 0 mm 6
20 Sept. Patchy rain possible
Patchy rain possible
19° /14° 0.1 mm 4
21 Sept. Overcast
Overcast
20° /14° 0 mm 5
22 Sept. Overcast
Overcast
19° /15° 0.1 mm 4
23 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
17° /13° 15.7 mm 4
24 Sept. Overcast
Overcast
16° /10° 0.4 mm 4
25 Sept. Heavy rain at times
Heavy rain at times
15° /9° 11.2 mm 4
26 Sept. Moderate rain at times
Moderate rain at times
16° /11° 3 mm 4
27 Sept. Heavy rain at times
Heavy rain at times
12° /6° 9.7 mm 3
28 Sept. Overcast
Overcast
13° /4° 0 mm 3
29 Sept. Overcast
Overcast
14° /7° 0.6 mm 3
30 Sept. Moderate rain
Moderate rain
13° /11° 18.1 mm 3
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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?
Enjoy moderate daytime temperatures of up to 17° 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 81 mm spread over approximately 18 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 22 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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Location coordinates Where is Boston?

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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