September weather forecast
Harpers Mill, MD

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Weather in September

The first month of the autumn, September, is still a warm month in Harpers Mill, Maryland, with an average temperature varying between 77.2°F (25.1°C) and 62.4°F (16.9°C).

Temperature

September's arrival aligns with a minor decrease in average high-temperatures, from August's moderately hot 83.8°F (28.8°C) to a still warm 77.2°F (25.1°C). Nightly temperatures drop to an average low of 62.4°F (16.9°C) in September.

Humidity

In Harpers Mill, the average relative humidity in September is 75%.

Rainfall

In September, the rain falls for 13.1 days. Throughout September, 2.2" (56mm) of precipitation is accumulated. In Harpers Mill, during the entire year, the rain falls for 157.2 days and collects up to 30.47" (774mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In Harpers Mill, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:50 pm EDT.

Sunshine

In Harpers Mill, Maryland, the average sunshine in September is 9.3h.

UV index

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 ordinary individuals.
Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.

Frequently asked questions

What is the usual temperature for Harpers Mill in September?

The average high-temperature, in September, in Harpers Mill, is 77.2°F (25.1°C), while the average low-temperature is 62.4°F (16.9°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is computed to be 91.4°F (33°C).

What is the average humidity in September?

In September, the average relative humidity is 75%.

How much does it rain in September?

In Harpers Mill, Maryland, in September, during 13.1 rainfall days, 2.2" (56mm) of precipitation is typically accumulated.

When it does not snow?

April through October are months without snowfall in Harpers Mill.

How many hours of daylight does Harpers Mill have in September?

In Harpers Mill, 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 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:50 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.3h.

What is the UV index reading in September?

In Harpers Mill, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
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
Harpers Mill, MD

Average temperature in September - Harpers Mill, MD
  • Average high temperature in September: 77.2°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in September: 62.4°F

The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

Average pressure in September
Harpers Mill, MD

Average pressure in September - Harpers Mill, 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
Harpers Mill, MD

Average wind speed in September - Harpers Mill, MD
  • Average wind speed in September: 6.6mph

The windiest months (with the highest average wind speed) are January, February and March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

Average humidity in September
Harpers Mill, MD

Average humidity in September - Harpers Mill, MD
  • Average humidity in September: 75%

The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are March, April and July (72%).

Average rainfall in September
Harpers Mill, MD

Average rainfall in September - Harpers Mill, MD
  • Average rainfall in September: 2.2"

The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (1.81").

Average rainfall days in September
Harpers Mill, MD

Average rainfall days in September - Harpers Mill, MD
  • Average rainfall days in September: 13.1 days

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

Average snowfall in September
Harpers Mill, MD

Average snowfall in September - Harpers Mill, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.09").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Harpers Mill, MD

Average snowfall days in September - Harpers Mill, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Harpers Mill, MD

Average daylight in September / Average sunshine in September - Harpers Mill, 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

Average sunshine days in September
Harpers Mill, MD

Average sunshine days in September - Harpers Mill, MD
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is November (19.9 days).
The months with the least sunshine days are May and July (10.8 days).

Average UV index in September
Harpers Mill, MD

Average UV index in September - Harpers Mill, 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, November and December (UV index 2).

Average cloud cover in September
Harpers Mill, MD

Average cloud cover in September - Harpers Mill, MD
  • Average cloud cover in September: 34

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in September
Harpers Mill, MD

Average visibility in September - Harpers Mill, 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).

Harpers Mill, Maryland, USA

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