September weather forecast and climate
Rockport, ME

Weather in September

The first month of the autumn, September, is still a comfortable month in Rockport, Maine, with temperature in the range of an average low of 54°F (12.2°C) and an average high of 64.9°F (18.3°C).

Temperature

In September, the average high-temperature marginally drops, from a pleasant 70.7°F (21.5°C) in August, to an enjoyable 64.9°F (18.3°C). In September, in Rockport, Maine, the average low-temperature is 54°F (12.2°C).

Humidity

In September, the average relative humidity is 81%.

Rainfall

The month with the least rainfall is September when the rain falls for 8.3 days and typically collects 0.75" (19mm) of precipitation.

Snowfall

In Rockport, Maine, snow does not fall in May through October.

Ocean temperature

In Rockport, the average seawater temperature is 58.3°F (14.6°C).
Note: Swimming in 58.3°F (14.6°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Rockport, the average length of the day is 12.5h.

Sunshine

In Rockport, the average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index in Rockport is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Rockport?

In Rockport, Maine, the average relative humidity in September is 81%.

What is the driest month in Rockport?

September is the month with the least rainfall in Rockport. Rain falls for 8.3 days and accumulates 0.75" (19mm) of precipitation.

How many days does it rain in September in Rockport?

In Rockport, in September, it is raining for 8.3 days, with typically 0.75" (19mm) of accumulated precipitation.

When it does not snow in Rockport?

In Rockport, Maine, snow does not fall in May through October.

How cold is the water in September in Rockport?

In Rockport, in September, the average water temperature is 58.3°F (14.6°C). Swimming in 58.3°F (14.6°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in September in Rockport?

In September, the average length of the day in Rockport, Maine, is 12.5h.

How long on average sun shines in September in Rockport?

The average sunshine in September in Rockport, Maine, is 8.5h.

What is the UV index reading in September in Rockport?

The average daily maximum UV index in September in Rockport, Maine, is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Rockport, ME

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

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).

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Average pressure in September
Rockport, ME

Average pressure in September - Rockport, ME
  • Average pressure in September: 30.04"

The month with the highest atmospheric pressure is September (30.04").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Rockport, ME

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).

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Average humidity in September
Rockport, ME

Average humidity in September - Rockport, ME
  • Average humidity in September: 81%

Months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (76%).

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Average rainfall in September
Rockport, ME

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").

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Average rainfall days in September
Rockport, ME

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).
Months with the least rainy days are January and February (6.8 days).

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Average snowfall in September
Rockport, ME

Average snowfall in September - Rockport, ME
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.69").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Rockport, ME

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).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in September
Rockport, ME

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).

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Average daylight in September /
Average sunshine in September
Rockport, ME

Average daylight in September / Average sunshine in September - Rockport, ME
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is December (Average sunshine: 4.6h).

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Average sunshine days in September
Rockport, ME

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).

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Average UV index in September
Rockport, ME

Average UV index in September - Rockport, ME
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in September
Rockport, ME

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).

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Average visibility in September
Rockport, ME

Average visibility in September - Rockport, ME
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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