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Weather in Boston for September 2025

Your guide to Boston weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Boston at the beginning of September is 24.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.1 °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.

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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 in September average weather

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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
Sunny
25° /16° 6.8 mm 6
Sept. 2 Moderate or heavy rain shower
Moderate or heavy rain shower
23° /14° 11.5 mm 5
Sept. 3 Cloudy
Cloudy
25° /14° 0 mm 6
Sept. 4 Sunny
Sunny
27° /15° 0 mm 6
Sept. 5 Overcast
Overcast
24° /15° 6.2 mm 6
Sept. 6 Overcast
Overcast
23° /17° 16.3 mm 5
Sept. 7 Partly cloudy
Partly cloudy
25° /16° 3.1 mm 6
Sept. 8 Sunny
Sunny
26° /15° 0.1 mm 7
Sept. 9 Sunny
Sunny
26° /16° 10.3 mm 6
Sept. 10 Sunny
Sunny
25° /16° 5.1 mm 6
Sept. 11 Partly cloudy
Partly cloudy
25° /15° 1.2 mm 6
Sept. 12 Sunny
Sunny
26° /16° 7.1 mm 6
Sept. 13 Overcast
Overcast
26° /17° 3 mm 6
Sept. 14 Sunny
Sunny
24° /15° 0 mm 6
Sept. 15 Overcast
Overcast
24° /14° 0.1 mm 6
Sept. 16 Heavy rain at times
Heavy rain at times
23° /13° 2.8 mm 6
Sept. 17 Partly cloudy
Partly cloudy
23° /14° 0.2 mm 6
Sept. 18 Overcast
Overcast
22° /16° 5.9 mm 5
Sept. 19 Sunny
Sunny
21° /15° 5.9 mm 5
Sept. 20 Sunny
Sunny
21° /14° 8.7 mm 5
Sept. 21 Cloudy
Cloudy
20° /12° 7.2 mm 5
Sept. 22 Overcast
Overcast
20° /13° 6.1 mm 5
Sept. 23 Overcast
Overcast
18° /14° 12 mm 5
Sept. 24 Overcast
Overcast
20° /13° 0.6 mm 5
Sept. 25 Patchy rain possible
Patchy rain possible
20° /12° 8.8 mm 5
Sept. 26 Moderate or heavy rain shower
Moderate or heavy rain shower
20° /13° 29.3 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
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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 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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Location coordinates Where is Boston?

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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