Climate averages 1991–2020
Brockton weather
in September.
A warm, moderately wet month: the 4th warmest and the joint 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Brockton: daytime highs average 22.1°C and nights cool to about 14.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 89 mm of rain on roughly 8 days, which makes September a moderately wet month (the joint 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 32 min on an average September day.
The nearest other city in this atlas is Quincy (19 km away). In September its highs average 21.9°C, about as warm as Brockton, with 88 mm of rain.
Among the 498 cities listed in the United States, Brockton ranks joint 451st of 498 for the warmest September highs and joint 335th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Brockton is 4.8°C cooler than that mean.
From September to October, average highs fall by 6.0°C to 16.0°C, and monthly rainfall rises from 89 mm to 104 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Brockton climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.2°C-5.4°C | -5.4°C | 92 | 9.7 | 9.59 h |
| February | 3.4°C-4.7°C | -4.7°C | 81 | 9.1 | 10.511 h |
| March | 6.9°C-1.2°C | -1.2°C | 112 | 11.1 | 11.912 h |
| April | 12.9°C4.2°C | 4.2°C | 95 | 11.2 | 13.313 h |
| May | 18.4°C9.7°C | 9.7°C | 77 | 10.6 | 14.515 h |
| June | 23.6°C15.1°C | 15.1°C | 86 | 9.7 | 15.215 h |
| July | 27.1°C18.7°C | 18.7°C | 77 | 9.9 | 14.915 h |
| August | 26.2°C18.2°C | 18.2°C | 89 | 9.6 | 13.914 h |
| September, selected | 22.1°C14.7°C | 14.7°C | 89 | 8.1 | 12.513 h |
| October | 16.0°C8.9°C | 8.9°C | 104 | 9.4 | 11.111 h |
| November | 10.2°C3.4°C | 3.4°C | 91 | 8.9 | 9.910 h |
| December | 5.1°C-1.6°C | -1.6°C | 110 | 10.6 | 9.29 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Quincy in SeptemberUnited States · 19 kmHigh 21.9°C · Low 14.8°C · 88 mm rain
- Dorchester in SeptemberUnited States · 24 kmHigh 22.2°C · Low 14.4°C · 88 mm rain
- Boston in SeptemberUnited States · 31 kmHigh 22.4°C · Low 14.1°C · 88 mm rain
- Newton in SeptemberUnited States · 32 kmHigh 22.6°C · Low 14.4°C · 85 mm rain
- Pawtucket in SeptemberUnited States · 38 kmHigh 23.1°C · Low 14.7°C · 89 mm rain
- Lynn in SeptemberUnited States · 43 kmHigh 21.0°C · Low 14.8°C · 87 mm rain
- Providence in SeptemberUnited States · 44 kmHigh 22.9°C · Low 14.9°C · 91 mm rain
- Fall River in SeptemberUnited States · 44 kmHigh 22.0°C · Low 15.3°C · 91 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Brockton) is explained once on the Brockton year overview and on the Sources, method and limits page.