September weather forecast
Cedar Grove Knolls, MD

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Cedar Grove Knolls, Maryland, with temperature in the range of an average low of 58.6°F (14.8°C) and an average high of 76.5°F (24.7°C).

Temperature

September signifies a gentle decline in Cedar Grove Knolls's average high-temperature, easing from a moderately hot 82.9°F (28.3°C) in August to a still warm 76.5°F (24.7°C). September generally records an average low-temperature of 58.6°F (14.8°C).

Humidity

In September, the average relative humidity is 77%.

Rainfall

In September, the rain falls for 14.3 days. Throughout September, 2.17" (55mm) of precipitation is accumulated. Throughout the year, there are 158.7 rainfall days, and 30.91" (785mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

In Cedar Grove Knolls, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

Sunshine

In Cedar Grove Knolls, the average sunshine in September is 9.1h.

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 unsafe exposure to UV radiation for ordinary individuals.
Note: An average UV index of 4 in September transforms into this advice:
Exercise prevention - Protecting skin and eyes from harm is required. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended.

Frequently asked questions

What are the temperatures in September?

In Cedar Grove Knolls, 76.5°F (24.7°C) is the average high-temperature and 58.6°F (14.8°C) is the average low-temperature during September. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, in August is evaluated at 89.6°F (32°C).

What is the average humidity in September in Cedar Grove Knolls?

The average relative humidity in September is 77%.

How many days does it rain in September?

In Cedar Grove Knolls, Maryland, in September, it is raining for 14.3 days, with typically 2.17" (55mm) of accumulated precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

In Cedar Grove Knolls, Maryland, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

In Cedar Grove Knolls, the average day length in September is 12h and 26min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:38 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.1h.

How high is the UV index in September?

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Cedar Grove Knolls, MD

Average temperature in September - Cedar Grove Knolls, MD
  • Average high temperature in September: 76.5°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in September: 58.6°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in September
Cedar Grove Knolls, MD

Average pressure in September - Cedar Grove Knolls, MD
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Cedar Grove Knolls, MD

Average wind speed in September - Cedar Grove Knolls, MD
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in September
Cedar Grove Knolls, MD

Average humidity in September - Cedar Grove Knolls, MD
  • Average humidity in September: 77%

The months with the highest relative humidity are May and October (79%).
The months with the lowest relative humidity are April and July (74%).

Average rainfall in September
Cedar Grove Knolls, MD

Average rainfall in September - Cedar Grove Knolls, MD
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is August (3.82").
The driest month (with the least rainfall) is January (1.93").

Average rainfall days in September
Cedar Grove Knolls, MD

Average rainfall days in September - Cedar Grove Knolls, MD
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in September
Cedar Grove Knolls, MD

Average snowfall in September - Cedar Grove Knolls, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is March (4.09").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Cedar Grove Knolls, MD

Average snowfall days in September - Cedar Grove Knolls, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Cedar Grove Knolls, MD

Average daylight in September / Average sunshine in September - Cedar Grove Knolls, MD
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in September
Cedar Grove Knolls, MD

Average sunshine days in September - Cedar Grove Knolls, MD
  • Average sunshine days in September: 14.2 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (10.8 days).

Average UV index in September
Cedar Grove Knolls, MD

Average UV index in September - Cedar Grove Knolls, MD
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Cedar Grove Knolls, MD

Average cloud cover in September - Cedar Grove Knolls, MD
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in September
Cedar Grove Knolls, MD

Average visibility in September - Cedar Grove Knolls, MD
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Cedar Grove Knolls, Maryland, USA

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