Boston
September
Weather in Boston for September 2025
Your guide to Boston weather in September - trends and predictions
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.
Boston in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 81 mm.
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Temperatures
Rain 🌧️
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12
Dry days
18
Rainy days
0
Snow days
17°/11°
Temperatures
22 km/h
Avg max wind
78 %
Avg humidity
Boston Weather September
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Temperatures trend during September in Boston
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September weather in Boston day by day
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Date | Weather | Temperatures | Rain | UV | More |
---|---|---|---|---|---|
1 Sept. | Patchy rain possible | 17° /11° | 0.1 mm | 3 | |
2 Sept. | Patchy rain possible | 22° /10° | 0.1 mm | 4 | |
3 Sept. | Patchy rain possible | 19° /12° | 3.9 mm | 3 | |
4 Sept. | Patchy rain possible | 20° /11° | 0.6 mm | 3 | |
5 Sept. | Patchy rain possible | 19° /12° | 0.5 mm | 3 | |
6 Sept. | Partly cloudy | 19° /9° | 0 mm | 4 | |
7 Sept. | Patchy rain possible | 20° /13° | 0.1 mm | 4 | |
8 Sept. | Moderate or heavy rain shower | 20° /14° | 5 mm | 5 | |
9 Sept. | Moderate rain at times | 16° /11° | 0.6 mm | 4 | |
10 Sept. | Heavy rain at times | 17° /8° | 3.7 mm | 4 | |
11 Sept. | Patchy rain possible | 14° /7° | 0.5 mm | 3 | |
12 Sept. | Patchy rain possible | 13° /5° | 0.3 mm | 3 | |
13 Sept. | Cloudy | 15° /6° | 0 mm | 4 | |
14 Sept. | Partly cloudy | 17° /7° | 0 mm | 5 | |
15 Sept. | Heavy rain at times | 20° /10° | 3.2 mm | 5 | |
16 Sept. | Partly cloudy | 17° /9° | 0 mm | 5 | |
17 Sept. | Sunny | 17° /9° | 0 mm | 5 | |
18 Sept. | Partly cloudy | 18° /12° | 0 mm | 5 | |
19 Sept. | Partly cloudy | 20° /13° | 0 mm | 6 | |
20 Sept. | Patchy rain possible | 19° /14° | 0.1 mm | 4 | |
21 Sept. | Overcast | 20° /14° | 0 mm | 5 | |
22 Sept. | Overcast | 19° /15° | 0.1 mm | 4 | |
23 Sept. | Moderate or heavy rain shower | 17° /13° | 15.7 mm | 4 | |
24 Sept. | Overcast | 16° /10° | 0.4 mm | 4 | |
25 Sept. | Heavy rain at times | 15° /9° | 11.2 mm | 4 | |
26 Sept. | Moderate rain at times | 16° /11° | 3 mm | 4 | |
27 Sept. | Heavy rain at times | 12° /6° | 9.7 mm | 3 | |
28 Sept. | Overcast | 13° /4° | 0 mm | 3 | |
29 Sept. | Overcast | 14° /7° | 0.6 mm | 3 | |
30 Sept. | 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.
Change Month
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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