Weather in South Boston, Massachusetts, United States in September
In an average September, South Boston sees a daily high around 74°F and a low around 54°F, based on 1981–2026 of local climate records.
| Average high | 74°F |
|---|---|
| Typical high range | 65°F to 83°F |
| Average low | 54°F |
| Typical low range | 46°F to 63°F |
| Average daily precipitation | 0.10 in |
September records
The most extreme September on record for each metric, across 1981–2026. For rainfall, the wettest and driest are by total September accumulation.
High
Highest
97°F
2002-09-09
Lowest
53°F
1992-09-30
Low
Highest
71°F
2010-09-03
Lowest
35°F
1991-09-30
Feels-like
Highest
119°F
2018-09-06
Lowest
29°F
1991-09-30
Humidity
Highest
20.5 g/m³
2023-09-08
Lowest
4.1 g/m³
1981-09-30
Wind
Highest
16 mph
1985-09-27
Lowest
3 mph
1999-09-15
Precip
Wettest
8.74 in
1999
Driest
1.34 in
2014
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