September weather forecast
Columbia, MD

A beautiful and scenic setting around the waterfront homes at Wilde Lake in Columbia, Maryland
A beautiful and scenic setting around the waterfront homes at Wilde Lake in Columbia, Maryland

Weather in September

The first month of the autumn, September, is still a warm month in Columbia, Maryland, with an average temperature varying between 60.6°F (15.9°C) and 77°F (25°C).

Temperature

In September, the average high-temperature marginally drops from a moderately hot 83.8°F (28.8°C) in August to a still warm 77°F (25°C). In September, in Columbia, Maryland, the average low-temperature is 60.6°F (15.9°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

In September, in Columbia, the rain falls for 13.3 days. Throughout September, 2.17" (55mm) of precipitation is accumulated. In Columbia, during the entire year, the rain falls for 159.3 days and collects up to 30.31" (770mm) of precipitation.

Snowfall

In Columbia, Maryland, snow does not fall in April through October.

Daylight

In Columbia, the average length of the day in September is 12h and 26min.
On the first day of September in Columbia, sunrise is at 6:36 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm EDT.

Sunshine

The average sunshine in September in Columbia is 9.1h.

UV index

In Columbia, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Columbia?

The average relative humidity in September is 75%.

How much does it rain in Columbia in September?

In Columbia, during September, the rain falls for 13.3 days and regularly aggregates up to 2.17" (55mm) of precipitation.

When it does not snow in Columbia?

April through October are months without snowfall.

How many hours of daylight does Columbia have in September?

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

What time are sunrise and sunset in September in Columbia?

On the first day of September in Columbia, Maryland, sunrise is at 6:36 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm EDT.

How long on average sun shines in September in Columbia?

In September, the average sunshine duration is 9.1h.

How high is the UV index in September in Columbia?

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

Average temperature in September
Columbia, MD

Average temperature in September - Columbia, 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).

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Average pressure in September
Columbia, MD

Average pressure in September - Columbia, 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).

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Average wind speed in September
Columbia, MD

Average wind speed in September - Columbia, 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).

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Average humidity in September
Columbia, MD

Average humidity in September - Columbia, 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%).

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Average rainfall in September
Columbia, MD

Average rainfall in September - Columbia, 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").

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Average rainfall days in September
Columbia, MD

Average rainfall days in September - Columbia, 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).

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Average snowfall in September
Columbia, MD

Average snowfall in September - Columbia, 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").

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Average snowfall days in September
Columbia, MD

Average snowfall days in September - Columbia, 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).

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Average daylight in September /
Average sunshine in September
Columbia, MD

Average daylight in September / Average sunshine in September - Columbia, MD
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 53min).
The month with the shortest days is December (Average daylight: 9h and 28min).

  • Average sunshine in September: 9h and 6min

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).

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Average sunshine days in September
Columbia, MD

Average sunshine days in September - Columbia, 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).

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Average UV index in September
Columbia, MD

Average UV index in September - Columbia, 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).

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Average cloud cover in September
Columbia, MD

Average cloud cover in September - Columbia, 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).

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Average visibility in September
Columbia, MD

Average visibility in September - Columbia, 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).

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