Boston
September
Weather in Boston for September 2026
Your guide to Boston weather in September - trends and predictions
So far, September 2026 in Boston is slightly warmer than the historical average by 1.1 °C.
The forecast for the upcoming days in Boston predicts a temperature of 21.5 °C, which is slightly above the historical average.
In general, the average temperature in Boston at the beginning of September is 21.3 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 20.4 °C by the end of September.
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.
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Temperatures
Rain 🌧️
More
16
Dry days
14
Rainy days
0
Snow days
18°/11°
Temperatures
24 km/h
Avg max wind
73 %
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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 22° /13° | 0.1 mm | 4 | |
| 2 Sept. | Patchy rain possible | 21° /13° | 1 mm | 4 | |
| 3 Sept. |  Moderate rain at times | 22° /14° | 3 mm | 3 | |
| 4 Sept. | Patchy rain possible | 18° /12° | 4.9 mm | 3 | |
| 5 Sept. | Patchy rain possible | 20° /12° | 0.2 mm | 4 | |
| 6 Sept. |  Overcast | 23° /14° | 0.3 mm | 4 | |
| 7 Sept. |  Heavy rain at times | 23° /15° | 1 mm | 4 | |
| 8 Sept. | Moderate or heavy rain shower | 20° /13° | 2.5 mm | 4 | |
| 9 Sept. | Moderate rain at times | 19° /10° | 0.2 mm | 4 | |
| 10 Sept. | Heavy rain at times | 20° /10° | 3 mm | 3 | |
| 11 Sept. | Patchy rain possible | 18° /10° | 0.3 mm | 3 | |
| 12 Sept. | Patchy rain possible | 18° /9° | 0.4 mm | 3 | |
| 13 Sept. |  Cloudy | 19° /10° | 1 mm | 3 | |
| 14 Sept. |  Partly cloudy | 20° /10° | 2.7 mm | 4 | |
| 15 Sept. | Heavy rain at times | 20° /12° | 1.3 mm | 4 | |
| 16 Sept. | Patchy rain possible | 18° /11° | 0.3 mm | 4 | |
| 17 Sept. |  Sunny | 18° /10° | 4.1 mm | 3 | |
| 18 Sept. | Patchy rain possible | 20° /12° | 0.6 mm | 4 | |
| 19 Sept. | Partly cloudy | 22° /14° | 0 mm | 6 | |
| 20 Sept. | Overcast | 19° /11° | 0 mm | 3.2 | |
| 21 Sept. | Sunny | 22° /9° | 0 mm | 3.3 | |
| 22 Sept. | Sunny | 24° /14° | 0 mm | 3.4 | |
| 23 Sept. | Overcast | 22° /12° | 0.2 mm | 3.1 | |
| 24 Sept. | Overcast | 18° /9° | 0 mm | 4 | |
| 25 Sept. | Sunny | 20° /10° | 0 mm | 5 | |
| 26 Sept. | Sunny | 21° /9° | 0 mm | 6 | |
| 27 Sept. | Sunny | 22° /11° | 0 mm | 6 | |
| 28 Sept. | Overcast | 21° /12° | 0 mm | 6 | |
| 29 Sept. | Overcast | 19° /9° | 0 mm | 5 | |
| 30 Sept. | Sunny | 22° /10° | 0 mm | 6 | |
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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 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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