September weather forecastLynn, MA
September
Weather in September
September brings many delightful changes to the weather pattern in Lynn. The city experiences a remarkable drop in air temperatures and a further decrease in precipitation amounting to 1.42" (36mm). The sea temperature stays comforting, while the decreasing daylight signals the advent of autumn. Windy evenings typically prevail in this month, rekindling fond memories of winter.Temperature
The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a moderately hot 79.3°F (26.3°C) to a pleasant 71.6°F (22°C). During the month of September, Lynn anticipates a mean low-temperature of 57.9°F (14.4°C).Humidity
In Lynn, the average relative humidity in September is 75%.Rainfall
September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.42" (36mm) of precipitation.Snowfall
In Lynn, snow does not fall in May through September.Ocean temperature
In September, the average ocean temperature is 64°F (17.8°C).Note: In 64°F (17.8°C), swimming is not an enjoyable activity for most. The challenge of managing one's breathing increases as the temperature goes under 69.8°F (21°C).
Daylight
The average length of the day in September is 12h and 29min.On the first day of September in Lynn, sunrise is at 6:09 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:26 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: In September, a regular UV index of 4 translates into these guidelines:
Be vigilant - Preventing sunburn is recommended. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Lynn, MA
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (34.2°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Lynn, 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
Lynn, MA
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Lynn, 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 (70%).
Average rainfall in September
Lynn, 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
Lynn, MA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in September
Lynn, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.61").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Lynn, MA
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Lynn, MA
- Average sea temperature in September: 64°F
The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is March (38.8°F).
Average daylight in September /
Average sunshine in September
Lynn, 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 18min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).
Average sunshine days in September
Lynn, MA
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is April (13.2 days).
Average UV index in September
Lynn, 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
Lynn, 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 32).
Average visibility in September
Lynn, 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).
