Brockton, MA weather in September
In September, Brockton sees highs around 75°F and lows around 54°F: mild, with some rain. There are about 9 days with rain. Good for outdoor plans.
- Normal high
- 75°F
- Normal low
- 54°F
- Wet days
- 9
- 4.1 in total
- Muggy days
- 4
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 80°F | 70°F |
| Normal low | 59°F | 49°F |
| Chance of a wet day | 29% | 35% |
| Sunrise / sunset | 6:09 am / 7:18 pm | 6:40 am / 6:28 pm |
| Daylight | 13.2 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am58°Fdew point 55°F
- 9 am67°Fdew point 57°F
- Noon71°Fdew point 56°F
- 3 pm71°Fdew point 56°F
- 6 pm65°Fdew point 57°F
- 9 pm60°Fdew point 56°F
NOAA hourly normals (local standard time) from Plymouth Muni Airport (19 mi away); average wind 7 mph; clear or few clouds in 32% of daytime hours, mostly cloudy or overcast in 48%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F16 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more4 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in7 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.1 in; a dry September brings about 2.3 in and a wet one about 5.0 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202015: average high 80°F
- Coolest September2006: average high 72°F
- Wettest September1999: 10.2 in
- Driest September2014: 0.7 in
- Highest reading97°F (September 8, 2015)
- Lowest reading30°F (September 25, 1997)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 83°F | 75°F | 64°F |
| Normal low | 62°F | 54°F | 43°F |
| Wet days | 9 | 9 | 11 |
| Comfortable days | 6 | 16 | 13 |
| Daylight | 13.8 h | 12.5 h | 11.1 h |
Highs change by -8°F from August and -11°F into October.
Nearby alternatives in September
- Cooler: Kennebunkport, ME93 mi · high 69°F · 10 wet days
How Brockton ranks in September
- Normal high276th warmest of 378 cities; 3rd of 9 in Massachusetts
- Wet days278th driest of 378
- Comfortable days63rd most of 342
What to pack for Brockton in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 93 heating degree days and 86 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Brockton in September?
The normal high is 75°F and the normal low is 54°F. From 1991 to 2020 the hottest September reading was 97°F (September 8, 2015).
Does it rain a lot in Brockton in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 4.1 in. The wettest September in 1991-2020 was in 1999 (10.2 in); the driest was in 2014 (0.7 in).
Is September a good time to visit Brockton?
September ranks 3rd of 12 months on our comfort score for Brockton (68 out of 100). It has about 16 comfortable days and about 1 day at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snow depth and frost dates: Brockton (USC00190860), 2.5 mi SSE of the city center, 75 ft . NOAA normals and daily records, 1991-2020.
- Snowfall: Norton W (USC00195984), 9.9 mi SW of the city center, 95 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Plymouth Muni Airport (USW00054769), 19 mi SE of the city center, 149 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Boston Logan Intl Airport (USW00014739), 19 mi N of the city center, 12 ft (101 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Gen E L Logan International Airport (725090-14739), 19 mi N of the city center, 11 ft (102 ft lower than the city). Hourly observations, 1991-2020.