Lowell, MA weather in September
Lowell is mild in September, with some rain: highs average 76°F and nights drop to about 52°F. There are about 9 days with rain. A good month for most outdoor plans.
- Normal high
- 76°F
- Normal low
- 52°F
- Wet days
- 9
- 3.9 in total
- Muggy days
- 4
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 81°F | 69°F |
| Normal low | 57°F | 46°F |
| Chance of a wet day | 29% | 33% |
| Sunrise / sunset | 6:10 am / 7:20 pm | 6:41 am / 6:29 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 am57°Fdew point 52°F
- 9 am65°Fdew point 53°F
- Noon71°Fdew point 52°F
- 3 pm73°Fdew point 52°F
- 6 pm68°Fdew point 54°F
- 9 pm63°Fdew point 54°F
NOAA hourly normals (local standard time) from Manchester Airport (22 mi away); average wind 6 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°F15 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 in6 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 3.9 in; a dry September brings about 2.0 in and a wet one about 6.0 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 81°F
- Coolest September1994: average high 71°F
- Wettest September2008: 9.0 in
- Driest September2019: 0.6 in
- Highest reading96°F (September 12, 2013)
- Lowest reading29°F (September 11, 1995)
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 | 76°F | 62°F |
| Normal low | 59°F | 52°F | 40°F |
| Wet days | 10 | 9 | 11 |
| Comfortable days | 6 | 15 | 11 |
| Daylight | 13.9 h | 12.5 h | 11.0 h |
Highs change by -7°F from August and -14°F into October.
Nearby alternatives in September
- Cooler: Kennebunkport, ME66 mi · high 69°F · 10 wet days
How Lowell ranks in September
- Normal high271st warmest of 378 cities; 2nd of 9 in Massachusetts
- Wet days262nd driest of 378
- Comfortable days91st most of 342
What to pack for Lowell in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 115 heating degree days and 70 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Lowell in September?
The normal high is 76°F and the normal low is 52°F. From 1991 to 2020 the hottest September reading was 96°F (most recently on September 12, 2013).
Does it rain a lot in Lowell in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 3.9 in. The wettest September in 1991-2020 was in 2008 (9.0 in); the driest was in 2019 (0.6 in).
Is September a good time to visit Lowell?
September ranks 2nd of 12 months on our comfort score for Lowell (67 out of 100). It has about 15 comfortable days and about 1 day at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain and frost dates: Lowell (USC00194313), 2.5 mi WNW of the city center, 110 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Reading (USC00196783), 12 mi SE of the city center, 110 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Manchester Airport (USW00014710), 22 mi NNW of the city center, 225 ft (108 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Boston Logan Intl Airport (USW00014739), 24 mi SE of the city center, 12 ft (105 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Gen E L Logan International Airport (725090-14739), 24 mi SE of the city center, 11 ft (106 ft lower than the city). Hourly observations, 1991-2020.