September weather forecast
Chateau Ridge, MD

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Chateau Ridge, Maryland, with temperature in the range of an average high of 77°F (25°C) and an average low of 60.6°F (15.9°C).

Temperature

September's arrival comes with a mild decrease in the average high-temperature, moving subtly from 83.8°F (28.8°C) in August to a still moderately hot 77°F (25°C). In the month of September, Chateau Ridge witnesses a consistent average low-temperature of 60.6°F (15.9°C).

Humidity

The average relative humidity in September is 75%.

Rainfall

In Chateau Ridge, during September, the rain falls for 13.3 days and regularly aggregates up to 2.17" (55mm) of precipitation. Throughout the year, there are 159.3 rainfall days, and 30.31" (770mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:36 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

Sunshine

In Chateau Ridge, the average sunshine in September is 9.1h.

UV index

In Chateau Ridge, Maryland, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 5 during September leads to these advisories:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.

Frequently asked questions

What is the usual temperature for Chateau Ridge in September?

In September, in Chateau Ridge, the average high-temperature is 77°F (25°C), and the average low-temperature is 60.6°F (15.9°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is estimated at 91.4°F (33°C).

What is the average humidity in September?

The average relative humidity in September is 75%.

How much does it rain in September?

In September, the rain falls for 13.3 days. Throughout September, 2.17" (55mm) of precipitation is accumulated.

When it does not snow?

In Chateau Ridge, snow does not fall in April through October.

What is the average length of the day in September?

The average day length in September is 12h and 26min.

When are sunrise and sunset in September?

On the first day of September in Chateau Ridge, sunrise is at 6:36 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

How long on average sun shines in September?

In Chateau Ridge, the average sunshine duration in September is 9.1h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to 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
Chateau Ridge, MD

Average temperature in September - Chateau Ridge, MD
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (38.1°F).

  • Average low temperature in September: 60.6°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average pressure in September
Chateau Ridge, MD

Average pressure in September - Chateau Ridge, MD
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Chateau Ridge, MD

Average wind speed in September - Chateau Ridge, MD
  • Average wind speed in September: 6.1mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in September
Chateau Ridge, MD

Average humidity in September - Chateau Ridge, MD
  • Average humidity in September: 75%

The months with the highest relative humidity are May and October (77%).
The months with the lowest relative humidity are April and July (72%).

Average rainfall in September
Chateau Ridge, MD

Average rainfall in September - Chateau Ridge, MD
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is August (4.06").
The driest month (with the least rainfall) is January (1.85").

Average rainfall days in September
Chateau Ridge, MD

Average rainfall days in September - Chateau Ridge, MD
  • Average rainfall days in September: 13.3 days

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (8.4 days).

Average snowfall in September
Chateau Ridge, MD

Average snowfall in September - Chateau Ridge, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is March (3.03").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Chateau Ridge, MD

Average snowfall days in September - Chateau Ridge, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Chateau Ridge, MD

Average daylight in September / Average sunshine in September - Chateau Ridge, 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 months with the least sunshine are January and February (Average sunshine: 5h and 6min).

Average sunshine days in September
Chateau Ridge, MD

Average sunshine days in September - Chateau Ridge, MD
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (11 days).

Average UV index in September
Chateau Ridge, MD

Average UV index in September - Chateau Ridge, MD
  • Average UV index in September: 5

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
Chateau Ridge, MD

Average cloud cover in September - Chateau Ridge, MD
  • Average cloud cover in September: 35

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in September
Chateau Ridge, MD

Average visibility in September - Chateau Ridge, MD
  • 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).

Chateau Ridge, Maryland, USA

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