September weather forecastRockport, ME
September
Weather in September
September announces the onset of autumn in Rockport, yet maintains a warm, pleasant climate. The weather gradually cools down, with high temperatures lowering to an average of 64.9°F (18.3°C). The sea temperature follows suit, dropping mildly to 58.3°F (14.6°C), but continues to invite beachgoers. The city starts donning shades of yellow and orange, embedded in the charm of falling leaves. September elegantly transitions Rockport from the vigor of summer to the calm of autumn.Temperature
The transition into September in Rockport is accompanied by a slight temperature decrease, with the average high-temperature shifting from a pleasant 70.7°F (21.5°C) in August to a comfortable 64.9°F (18.3°C). Throughout the month of September, Rockport observes an average nighttime temperature of 54°F (12.2°C).Humidity
The average relative humidity in September in Rockport is 81%.Rainfall
September is the month with the least rainfall in Rockport, Maine. Rain falls for 8.3 days and accumulates 0.75" (19mm) of precipitation.Snowfall
May through October are months without snowfall.Ocean temperature
In Rockport, Maine, in September, the average water temperature is 58.3°F (14.6°C).Note: Dipping into 58.3°F (14.6°C) below 50°F (10°C) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 55.4°F (13°C) can be jarring.
Daylight
In Rockport, 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 7:11 pm. On the last day of the month, sunrise is at 6:33 am and sunset at 6:18 pm EDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 4 during September leads to these instructions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rockport, ME
- Average high temperature in September: 64.9°F
The warmest month (with the highest average high temperature) is August (70.7°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 54°F
The months with the highest average low temperature are July and August (59.4°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in September
Rockport, 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
Rockport, ME
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.2mph).
Average humidity in September
Rockport, ME
- Average humidity in September: 81%
The months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (76%).
Average rainfall in September
Rockport, ME
- Average rainfall in September: 0.75"
The wettest months (with the highest rainfall) are April, November and December (1.42").
The driest month (with the least rainfall) is September (0.75").
Average rainfall days in September
Rockport, ME
- Average rainfall days in September: 8.3 days
The month with the highest number of rainy days is April (13.2 days).
The months with the least rainy days are January and February (6.8 days).
Average snowfall in September
Rockport, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Rockport, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Rockport, 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
Rockport, ME
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 30min).
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 36min).
Average sunshine days in September
Rockport, ME
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is September (19.9 days).
The month with the least sunshine days is April (13.8 days).
Average UV index in September
Rockport, 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
Rockport, 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
Rockport, 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).
