United StatesThe weather in September in Boston
It's warm in September in Boston with an average temperature of 24°C. Temperatures this month range from a low of 18°C to a high of 28°C. At night, you can expect temperatures between 13°C and 20°C.
Looking for great weather? September is a good time to be in Boston. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Boston, Massachusetts. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 36°C in 2018, Boston reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 13°C in 2014. The extreme nighttime temperatures ranged from a lowest recorded value of 6°C to a highest value of 26°C.
Water temperature
The water temperature at Boston is 19°C this month. Refreshing if you feel like a swim.
Rainfall amount
In September, there is an average of 81 mm of precipitation, spread over 10 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Boston
Click on any day in September to get detailed info about the usual weather on that day in Boston. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Boston | New York | |
|---|---|---|
| Average temperature | 24°C | 27°C |
| Max. temperature | 28°C | 31°C |
| Min. temperature | 13°C | -5°C |
| Total precipitation | 81 mm | 57 mm |
| Rainy days | 10 days | 9 days |
Start of September
The month of September starts in Boston with warm temps, averaging around 26°C during the day and nights around 19°C.
Mid September
By mid-September, daytime temps drop to around 24°C, with nights around 17°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Boston is around 23°C, while nighttime temps are about 15°C. A shower might pop up, but overall, the weather will be dry and sunny.
Find affordable trips to Boston
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Boston for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Boston, Massachusetts. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Boston
Temperature in September in Boston over the years
Precipitation charts
These charts show the average amount of precipitation in September in Boston, Massachusetts. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Boston
Total precipitation in September in Boston over the years
Daily UV index in September in Boston
This chart shows the average daily UV index in September in Boston, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Boston
Have you been to Boston in September?
Share your weather experience in September in Boston.
Average weather in Boston by month
Click on a month below to see detailed weather info for Boston. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.