Lowell weather in September: Lowell, Massachusetts: normal highs, lows, rain and records for September
Lowell in September has a normal high of 76°F and a normal low of 52°F, a daily mean of 64°F, falling from 81°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 3.89 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 11°C, 99 mm of precipitation in September.
- NOAA stationLowell
- Station IDUSC00194313
- Location42.64°N 71.36°W
- Elevation110 ft (34 m)
- From the center2 miles
- Population120,418
- Jan 34° 16°
- Feb 37° 17°
- Mar 45° 24°
- Apr 59° 35°
- May 70° 45°
- Jun 79° 55°
- Jul 85° 61°
- Aug 83° 59°
- Sep 76° 52°
- Oct 62° 40°
- Nov 51° 30°
- Dec 40° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Lowell in September?
The normal high is 76°F and the normal low 52°F, for a daily mean of 63.5°F. September is 7.6°F cooler than August and 12.6°F warmer than October. September is the 4th warmest month of the year in Lowell and the 7th wettest. Across the month the normal high falls 12°F, from 81°F on September 1 to 69°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 61°F and 66°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 57°F | 29% | 19% |
| September 8 | 79°F | 55°F | 29% | 19% |
| September 15 | 76°F | 52°F | 30% | 20% |
| September 22 | 73°F | 49°F | 32% | 22% |
| September 30 | 69°F | 46°F | 33% | 24% |
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 | 81°F | 57°F | 29% | 19% | 13 h 10 min |
| September 2 | 80°F | 56°F | 29% | 19% | 13 h 10 min |
| September 3 | 80°F | 56°F | 29% | 19% | 13 h 10 min |
| September 4 | 80°F | 56°F | 29% | 19% | 13 h |
| September 5 | 80°F | 55°F | 29% | 19% | 13 h |
| September 6 | 79°F | 55°F | 29% | 19% | 13 h |
| September 7 | 79°F | 55°F | 29% | 19% | 13 h |
| September 8 | 79°F | 55°F | 29% | 19% | 12 h 50 min |
| September 9 | 78°F | 54°F | 29% | 19% | 12 h 50 min |
| September 10 | 78°F | 54°F | 30% | 20% | 12 h 50 min |
| September 11 | 78°F | 53°F | 30% | 20% | 12 h 50 min |
| September 12 | 77°F | 53°F | 30% | 20% | 12 h 40 min |
| September 13 | 77°F | 53°F | 30% | 20% | 12 h 40 min |
| September 14 | 76°F | 52°F | 30% | 20% | 12 h 40 min |
| September 15 | 76°F | 52°F | 30% | 20% | 12 h 30 min |
| September 16 | 76°F | 52°F | 31% | 21% | 12 h 30 min |
| September 17 | 75°F | 51°F | 31% | 21% | 12 h 30 min |
| September 18 | 75°F | 51°F | 31% | 21% | 12 h 30 min |
| September 19 | 74°F | 50°F | 31% | 21% | 12 h 20 min |
| September 20 | 74°F | 50°F | 31% | 21% | 12 h 20 min |
| September 21 | 74°F | 50°F | 32% | 22% | 12 h 20 min |
| September 22 | 73°F | 49°F | 32% | 22% | 12 h 10 min |
| September 23 | 73°F | 49°F | 32% | 22% | 12 h 10 min |
| September 24 | 72°F | 48°F | 32% | 22% | 12 h 10 min |
| September 25 | 72°F | 48°F | 32% | 23% | 12 h 10 min |
| September 26 | 71°F | 47°F | 33% | 23% | 12 h |
| September 27 | 71°F | 47°F | 33% | 23% | 12 h |
| September 28 | 70°F | 47°F | 33% | 24% | 12 h |
| September 29 | 70°F | 46°F | 33% | 24% | 11 h 50 min |
| September 30 | 69°F | 46°F | 33% | 24% | 11 h 50 min |
- Normal high
- 76°FSeptember average
- Normal low
- 52°FSeptember average
- Precipitation
- 3.89 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
- 10
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00194313; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Lowell in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 30 (33%). In all, 3.89 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Lowell, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00194313.
What are the records for September in Lowell?
The warmest September temperature on this station's record (since 1885) is 100°F, on September 2, 1953; the coldest is 26°F, on September 20, 1979. The wettest September brought 10.14 in (1933).
The September mean against the 1991-2020 normal of 63.5°F: 2021 66.4°F (+2.9), 2022 63.5°F (at normal), 2024 64.7°F (+1.2), 2025 64.9°F (+1.4). 3 of 4 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.4°F | +2.9°F | 6.30 in |
| 2022 | 63.5°F | at normal | 6.52 in |
| 2024 | 64.7°F | +1.2°F | 1.63 in |
| 2025 | 64.9°F | +1.4°F | 2.52 in |
Source: records: ACIS, station USC00194313; recent months: ACIS, station USC00194313. Records and recent months use complete months only.
How does September in Lowell 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; Lowell's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.