September weather forecastLowell, MA
September
Weather in September
September in Lowell signifies the onset of the fall season, evident in the cooling temperatures and shorter sunlit hours. Highlighting September's transitional nature is the absence of snowfall, and daylight hours average at about 12.5. The temperatures fall into the snug range of 55.4°F (13°C) to 72.5°F (22.5°C), escorting in the coolness of the forthcoming fall months. These traits mark the noticeable shift from the hot summer season towards the cooler autumn spell.Temperature
With the onset of September, Lowell's climate undergoes a slight change as the average high-temperature moves from a warm 80.6°F (27°C) in August to an agreeable 72.5°F (22.5°C). Nighttime temperature lowers to an average of 55.4°F (13°C) in September.Humidity
In September, the average relative humidity in Lowell is 76%.Rainfall
September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.46" (37mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:10 am and sunset at 7:19 pm. On the last day of September, sunrise is at 6:42 am and sunset at 6:27 pm EDT.
Sunshine
In September, the average sunshine in Lowell is 8.5h.UV index
In Lowell, Massachusetts, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Lowell, MA
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in September
Lowell, MA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Lowell, MA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Lowell, MA
- Average humidity in September: 76%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (70%).
Average rainfall in September
Lowell, MA
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is December (2.87").
The driest month (with the least rainfall) is September (1.46").
Average rainfall days in September
Lowell, MA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (6.9 days).
Average snowfall in September
Lowell, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lowell, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lowell, MA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Lowell, MA
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (13.6 days).
Average UV index in September
Lowell, MA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Lowell, MA
- Average cloud cover in September: 36
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Lowell, MA
- Average visibility in September: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
