September weather forecastLeominster, MA
September
Weather in September
September marks the arrival of autumn in Leominster. The month witnesses falling temperatures, shorter daylight hours, and an increase in cloudy days compared to August. However, September holds its appeal with mild weather and changing foliage. Mercury readings remain manageable, varying between 53.6°F (12°C) and 71.6°F (22°C). A walk through the city offers scenic views of leaves turning vibrant shades of gold and orange, a quintessential fall scene.Temperature
The average high-temperature slightly decreases in September, shifting from a moderately hot 79.3°F (26.3°C) in August to an agreeable 71.6°F (22°C). In the month of September, the average temperature dips to a fresh 53.6°F (12°C) during the night.Humidity
In Leominster, the average relative humidity in September is 78%.Rainfall
September is the month with the least rainfall. Rain falls for 12.7 days and accumulates 1.73" (44mm) of precipitation.Snowfall
In Leominster, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:12 am and sunset at 7:20 pm. On the last day of September, in Leominster, sunrise is at 6:43 am and sunset at 6:29 pm EDT.
Sunshine
In September, the average sunshine is 8.1h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests this advice:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Around midday, solar radiation is most harmful; hence, exposure should be limited. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Leominster, MA
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (30.9°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in September
Leominster, MA
- Average pressure in September: 30.06"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
Leominster, MA
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Leominster, MA
- Average humidity in September: 78%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
Leominster, MA
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is December (2.91").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in September
Leominster, MA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is May (15.5 days).
The months with the least rainy days are January and February (7.3 days).
Average snowfall in September
Leominster, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.54").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Leominster, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Leominster, 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 6min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
Leominster, MA
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is April (13.2 days).
Average UV index in September
Leominster, 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
Leominster, MA
- Average cloud cover in September: 40
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Leominster, MA
- Average visibility in September: 5mi
The months with the highest visibility are April, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September and October (5mi).
