September weather in Fitchburg, MA
The average temperature in Fitchburg in September is 62.3°F (51.4°F–73.2°F). Average precipitation: 4.25 inches.
September is a fall month in Fitchburg, and is warmer than the annual average of 47.6°F. Daily temperatures swing about 21.8°F between overnight low and afternoon high. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
73.2°F
Avg Low
51.4°F
Precipitation
4.25 in
Daylight
12h 16m
September records in Fitchburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 79.0°F (2022) | 46.0°F (2023) | 0.12 in (2024) |
| September 2 | 77.0°F (2025) | 44.1°F (2022) | 3.58 in (2021) |
| September 3 | 77.0°F (2022) | 45.0°F (2024) | 0.16 in (2020) |
| September 4 | 84.0°F (2023) | 46.0°F (2024) | 1.00 in (2017) |
| September 5 | 89.1°F (2020) | 48.0°F (2019) | 0.38 in (2022) |
| September 6 | 89.1°F (2023) | 48.9°F (2019) | 1.90 in (2022) |
| September 7 | 87.1°F (2023) | 50.0°F (2019) | 2.62 in (2017) |
| September 8 | 91.0°F (2023) | 45.0°F (2025) | 0.13 in (2017) |
| September 9 | 87.1°F (2020) | 43.0°F (2025) | 0.37 in (2021) |
| September 10 | 84.9°F (2020) | 48.0°F (2025) | 0.88 in (2021) |
| September 11 | 84.0°F (2022) | 46.9°F (2021) | 1.76 in (2018) |
| September 12 | 82.0°F (2019) | 45.0°F (2020) | 3.94 in (2023) |
| September 13 | 81.0°F (2022) | 44.1°F (2019) | 0.78 in (2021) |
| September 14 | 84.9°F (2024) | 41.0°F (2019) | 0.44 in (2023) |
| September 15 | 82.9°F (2024) | 39.0°F (2020) | 0.11 in (2017) |
| September 16 | 82.0°F (2021) | 39.0°F (2020) | 0.27 in (2021) |
| September 17 | 84.0°F (2024) | 39.0°F (2022) | 0.02 in (2023) |
| September 18 | 82.9°F (2024) | 44.1°F (2019) | 2.49 in (2018) |
| September 19 | 82.0°F (2025) | 34.0°F (2019) | 1.93 in (2018) |
| September 20 | 81.0°F (2024) | 32.0°F (2020) | 1.29 in (2022) |
| September 21 | 80.1°F (2019) | 30.9°F (2020) | 0.49 in (2024) |
| September 22 | 86.0°F (2019) | 32.0°F (2020) | 0.36 in (2024) |
| September 23 | 87.1°F (2019) | 39.9°F (2020) | 0.82 in (2022) |
| September 24 | 90.0°F (2019) | 43.0°F (2022) | 0.69 in (2016) |
| September 25 | 73.9°F (2020) | 44.1°F (2022) | 0.95 in (2025) |
| September 26 | 79.0°F (2020) | 46.0°F (2022) | 1.50 in (2018) |
| September 27 | 80.1°F (2025) | 39.0°F (2023) | 1.41 in (2018) |
| September 28 | 82.9°F (2025) | 37.9°F (2022) | 0.16 in (2018) |
| September 29 | 79.0°F (2020) | 42.1°F (2023) | 0.63 in (2023) |
| September 30 | 79.0°F (2020) | 39.0°F (2022) | 1.74 in (2023) |