September weather forecastLynnfield, MA
September
Weather in September
September, the first month of the autumn in Lynnfield, is also an agreeable month, with an average temperature fluctuating between 57.9°F (14.4°C) and 71.4°F (21.9°C).Temperature
The onset of September results in a small decrease in the average high-temperature, moderately receding from a moderately hot 78.6°F (25.9°C) in August to a pleasant 71.4°F (21.9°C). In Lynnfield, the average temperature during the nights of September drops to a refreshing 57.9°F (14.4°C).Humidity
In Lynnfield, the average relative humidity in September is 75%.Rainfall
The month with the least rainfall is September, when the rain falls for 11 days and typically collects 1.42" (36mm) of precipitation.Snowfall
In Lynnfield, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:09 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:26 pm EDT.
Sunshine
In Lynnfield, the average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Lynnfield, MA
- Average high temperature in September: 71.4°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Lynnfield, MA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Lynnfield, MA
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in September
Lynnfield, MA
- Average humidity in September: 75%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Lynnfield, MA
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is September (1.42").
Average rainfall days in September
Lynnfield, MA
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in September
Lynnfield, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.45").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Lynnfield, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lynnfield, 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 18min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).
Average sunshine days in September
Lynnfield, MA
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is January (17.7 days).
The month with the least sunshine days is April (13.3 days).
Average UV index in September
Lynnfield, 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
Lynnfield, MA
- Average cloud cover in September: 36
The month with the most cloud cover is March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Lynnfield, MA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
