September weather forecastRockland, ME
September
Weather in September
September in Rockland, Maine signals the onset of fall, with temperatures decreasing to 63.3°F (17.4°C). The number of rainy days drops while the daylight hours gradually reduce. However, the weather remains pleasant for outdoor activities. Cloud cover begins to increase slightly, but sunshine still remains abundant, resulting in pleasant and often stunning autumn days. A distinct feature of this month is the changing foliage creating a beautiful, colorful landscape.Temperature
A modest decline in the average high-temperature is seen during September, decreasing from an agreeable 68.7°F (20.4°C) in August to a comfortable 63.3°F (17.4°C). Rockland's September nights exhibit a subtle drop in temperature, averaging at a moderate 55.6°F (13.1°C), closely aligned with the daytime highs.Humidity
In Rockland, the average relative humidity in September is 81%.Rainfall
September is the month with the least rainfall. Rain falls for 10.4 days and accumulates 1.81" (46mm) of precipitation.Snowfall
In Rockland, snow does not fall in May through October.Ocean temperature
In Rockland, the average seawater temperature in September is 58.3°F (14.6°C).Note: Entering waters of 58.3°F (14.6°C) is life-endangering. A mere moment in 55.4°F (13°C) waters feels piercing cold, and below 50°F (10°C) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.
Daylight
The average length of the day in September is 12h and 30min.On the first day of September, sunrise is at 6:00 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:33 am and sunset at 6:18 pm EDT.
Sunshine
In September, the average sunshine is 8.5h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Take necessary precautions - Protection from skin and eye injury is mandatory. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rockland, ME
- Average high temperature in September: 63.3°F
The warmest month (with the highest average high temperature) is August (68.7°F).
The month with the lowest average high temperature is January (31.8°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is August (60.6°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in September
Rockland, ME
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Rockland, ME
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is January (14.9mph).
The calmest months (with the lowest average wind speed) are July and August (8.2mph).
Average humidity in September
Rockland, ME
- Average humidity in September: 81%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is November (75%).
Average rainfall in September
Rockland, ME
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in September
Rockland, ME
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in September
Rockland, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.83").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Rockland, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in September
Rockland, ME
- Average sea temperature in September: 58.3°F
The best month for swimming (with the highest average sea temperature) is August (60.4°F).
The coldest month (with the lowest average sea temperature) is March (37.8°F).
Average daylight in September /
Average sunshine in September
Rockland, ME
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 30min).
Average sunshine days in September
Rockland, ME
- Average sunshine days in September: 18 days
The month with the most sunshine days is September (18 days).
The month with the least sunshine days is April (11.5 days).
Average UV index in September
Rockland, ME
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Rockland, ME
- Average cloud cover in September: 32
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Rockland, ME
- 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).
