Boston Weather: September
 |
Average Day Temperature: | 74.7°F |
|
Average Night Temperature: | 62.8°F |
|
Sea Water Temperature: | 65.9°F |
|
Number of Sunny Days: | 13 days |
| Sunshine Hours: | 11.8 - 13.1 hours | |
|
Number of Rainy Days: | 3 days |
| Precipitation Totals: | 1.6 in | |
| detailed information | ||
forecast
| Boston |
Temperature
| Boston |
Air Temperature in September, °F
The highest day temperature in September 2025 was 88°F. The lowest night temperature was 47°F. The average values for day and night temperatures during September were 75.0°F и 61.4°F respectivly.
Boston Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Boston was 65.3°F. The maximum and minimum values were 61.2°F and 68.6°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Boston is 1.6 in. It makes september the least rainy month of the year.
The average wind speed in September is 8.0 mph. It makes September one of the most windless months of the year for Boston.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Boston in September is 7.5 hours.
Boston on the Weather Map
| Chicago |  |
0 |
| Hawaii |  |
+78 |
| Honolulu | |
+78 |
| Houston | |
+46 |
| Las Vegas |  |
+40 |
| Los Angeles | |
+52 |
| Maui | |
+72 |
| Miami | |
+72 |
| Miami Beach | |
+80 |
| New York | |
+18 |
| San Diego | |
+54 |
| San Francisco | |
+46 |
| Sarasota | |
+62 |
| Tampa | |
+62 |
| Washington | |
+28 |
| 0300 |  |
8°F | SE 11 mph |
| 0600 | |
6°F | SE 7 mph |
| 0900 |  |
10°F | E 4 mph |
| 1200 | |
20°F | NE 6 mph |
| 1500 | |
24°F | NE 8 mph |
| 1800 | |
22°F | NE 6 mph |
| 2100 |  |
20°F | NE 6 mph |
| 0000 |  |
20°F | NE 5 mph |