September weather forecastNorthborough, MA
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Northborough, Massachusetts, with an average temperature varying between 72.9°F (22.7°C) and 54.7°F (12.6°C).Temperature
Transition into September subtly marks a drop in the average high-temperature, moderately moving from a moderately hot 80.4°F (26.9°C) in August to a pleasant 72.9°F (22.7°C). During September, the nighttime temperature averages to a cool 54.7°F (12.6°C).Humidity
In Northborough, the average relative humidity in September is 77%.Rainfall
September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.34" (34mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Northborough, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:12 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:29 pm EDT.
Sunshine
In Northborough, the average sunshine in September is 8.4h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A daily high UV index of 4 in September leads to these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. 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
Northborough, MA
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Northborough, 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
Northborough, MA
- Average wind speed in September: 6mph
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
Northborough, MA
- Average humidity in September: 77%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Northborough, MA
- Average rainfall in September: 1.34"
The wettest months (with the highest rainfall) are March, November and December (2.56").
The driest month (with the least rainfall) is September (1.34").
Average rainfall days in September
Northborough, 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 January (6.8 days).
Average snowfall in September
Northborough, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Northborough, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Northborough, MA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Northborough, MA
- Average sunshine days in September: 16 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is April (13.4 days).
Average UV index in September
Northborough, 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
Northborough, MA
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Northborough, MA
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, May, October, November and December (6mi).
The months with the lowest visibility are February, June, July, August and September (5mi).
