Brockton weather in September: Brockton, Massachusetts: normal highs, lows, rain and records for September
Brockton in September has a normal high of 75°F and a normal low of 54°F, a daily mean of 65°F, falling from 80°F on the 1st to 70°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 4.08 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 12°C, 104 mm of precipitation in September.
- NOAA stationBrockton
- Station IDUSC00190860
- Location42.05°N 71.01°W
- Elevation75 ft (23 m)
- From the center3 miles
- Population105,788
- Jan 39° 21°
- Feb 41° 22°
- Mar 48° 29°
- Apr 59° 38°
- May 70° 47°
- Jun 78° 57°
- Jul 84° 63°
- Aug 83° 62°
- Sep 75° 54°
- Oct 64° 43°
- Nov 54° 34°
- Dec 44° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Brockton in September?
The normal high is 75°F and the normal low 54°F, for a daily mean of 64.8°F. September is 7.6°F cooler than August and 11.3°F warmer than October. September is the 4th warmest month of the year in Brockton and the 7th wettest. Across the month the normal high falls 10°F, from 80°F on September 1 to 70°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 67°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 80°F | 59°F | 29% | 19% |
| September 8 | 78°F | 57°F | 30% | 20% |
| September 15 | 76°F | 55°F | 31% | 21% |
| September 22 | 73°F | 52°F | 33% | 22% |
| September 30 | 70°F | 49°F | 35% | 23% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 80°F | 59°F | 29% | 19% | 13 h 10 min |
| September 2 | 80°F | 59°F | 29% | 19% | 13 h 10 min |
| September 3 | 80°F | 59°F | 29% | 19% | 13 h 10 min |
| September 4 | 79°F | 58°F | 29% | 19% | 13 h |
| September 5 | 79°F | 58°F | 29% | 19% | 13 h |
| September 6 | 79°F | 58°F | 29% | 19% | 13 h |
| September 7 | 79°F | 57°F | 30% | 20% | 13 h |
| September 8 | 78°F | 57°F | 30% | 20% | 12 h 50 min |
| September 9 | 78°F | 57°F | 30% | 20% | 12 h 50 min |
| September 10 | 78°F | 56°F | 30% | 20% | 12 h 50 min |
| September 11 | 77°F | 56°F | 30% | 20% | 12 h 40 min |
| September 12 | 77°F | 56°F | 30% | 20% | 12 h 40 min |
| September 13 | 76°F | 55°F | 31% | 20% | 12 h 40 min |
| September 14 | 76°F | 55°F | 31% | 20% | 12 h 40 min |
| September 15 | 76°F | 55°F | 31% | 21% | 12 h 30 min |
| September 16 | 75°F | 54°F | 31% | 21% | 12 h 30 min |
| September 17 | 75°F | 54°F | 32% | 21% | 12 h 30 min |
| September 18 | 75°F | 53°F | 32% | 21% | 12 h 20 min |
| September 19 | 74°F | 53°F | 32% | 21% | 12 h 20 min |
| September 20 | 74°F | 53°F | 33% | 22% | 12 h 20 min |
| September 21 | 73°F | 52°F | 33% | 22% | 12 h 20 min |
| September 22 | 73°F | 52°F | 33% | 22% | 12 h 10 min |
| September 23 | 73°F | 51°F | 34% | 22% | 12 h 10 min |
| September 24 | 72°F | 51°F | 34% | 22% | 12 h 10 min |
| September 25 | 72°F | 51°F | 34% | 22% | 12 h 10 min |
| September 26 | 71°F | 50°F | 35% | 23% | 12 h |
| September 27 | 71°F | 50°F | 35% | 23% | 12 h |
| September 28 | 71°F | 49°F | 35% | 23% | 12 h |
| September 29 | 70°F | 49°F | 35% | 23% | 11 h 50 min |
| September 30 | 70°F | 49°F | 35% | 23% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 4.08 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 23
- Days at 80°F or more
- 9
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00190860; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Brockton in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 30 (35%). In all, 4.08 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Brockton, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00190860.
What are the records for September in Brockton?
The warmest September temperature on this station's record (since 1894) is 100°F, on September 2, 1953; the coldest is 27°F, on September 29, 1957. The wettest September brought 10.27 in (1918).
The September mean against the 1991-2020 normal of 64.8°F: 2021 69.4°F (+4.6), 2022 66.5°F (+1.7), 2023 69.2°F (+4.4), 2024 66.6°F (+1.8), 2025 67.6°F (+2.8), 2026 66.3°F (+1.5). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 69.4°F | +4.6°F | 6.96 in |
| 2022 | 66.5°F | +1.7°F | 5.61 in |
| 2023 | 69.2°F | +4.4°F | 6.94 in |
| 2024 | 66.6°F | +1.8°F | 2.79 in |
| 2025 | 67.6°F | +2.8°F | 5.21 in |
| 2026 | 66.3°F | +1.5°F | 10.05 in |
Source: records: ACIS, station USC00190860; recent months: ACIS, station USC00190860. Records and recent months use complete months only.
How does September in Brockton compare across Massachusetts?
Across the 35 places PlainClimate covers in Massachusetts, September normal highs run from 70°F in East Sandwich to 78°F in Maynard; Brockton's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Brockton in August83°F by day, 62°F at night
- Brockton in October64°F by day, 43°F at night
- Brockton through the yearEvery month, frost dates, records and recent years
- Massachusetts in SeptemberThe statewide normal and the warmest and coolest places
- Maynard: Massachusetts's warmest Septembernormal high 78°F