September weather forecast
Stewarts Purchase, MD

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Stewarts Purchase, Maryland, with an average temperature varying between 63.3°F (17.4°C) and 77.4°F (25.2°C).

Temperature

As August transitions into September, Stewarts Purchase sees a gentle drop in the average high-temperature, transitioning from 83.7°F (28.7°C) to a still moderately hot 77.4°F (25.2°C). September is noted for a mean low-temperature of 63.3°F (17.4°C).

Humidity

In Stewarts Purchase, the average relative humidity in September is 75%.

Rainfall

September is the month with the least rainfall in Stewarts Purchase. Rain falls for 11.8 days and accumulates 1.89" (48mm) of precipitation.

Snowfall

In Stewarts Purchase, snow does not fall in May through October.

Daylight

In Stewarts Purchase, the average length of the day in September is 12h and 26min.
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.

Sunshine

In September, the average sunshine in Stewarts Purchase is 9.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 5 suggests this advice:
Act with care - Obligation to protect against skin and eye damage is highlighted. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.

Frequently asked questions

What is the usual temperature for Stewarts Purchase in September?

In Stewarts Purchase, in September, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 63.3°F (17.4°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is calculated to be 91.4°F (33°C).

What is the average humidity in September?

In September, the average relative humidity is 75%.

What is the driest month in Stewarts Purchase?

The month with the least rainfall is September, when the rain falls for 11.8 days and typically collects 1.89" (48mm) of precipitation.

How much does it rain in September?

In Stewarts Purchase, Maryland, during September, the rain falls for 11.8 days and regularly aggregates up to 1.89" (48mm) of precipitation.

When it does not snow in Stewarts Purchase?

May through October are months without snowfall in Stewarts Purchase.

How many hours of daylight does Stewarts Purchase have in September?

In September, the average day length is 12h and 26min.

When is the sunrise / sunset in September?

In September, on the first day of the month, 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 9.2h.

How high is the UV index in September?

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health threat 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
Stewarts Purchase, MD

Average temperature in September - Stewarts Purchase, MD
  • Average high temperature in September: 77.4°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 (39.6°F).

  • Average low temperature in September: 63.3°F

The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).

Average pressure in September
Stewarts Purchase, MD

Average pressure in September - Stewarts Purchase, 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
Stewarts Purchase, MD

Average wind speed in September - Stewarts Purchase, MD
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

Average humidity in September
Stewarts Purchase, MD

Average humidity in September - Stewarts Purchase, MD
  • Average humidity in September: 75%

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March, April and November (72%).

Average rainfall in September
Stewarts Purchase, MD

Average rainfall in September - Stewarts Purchase, MD
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is August (3.54").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in September
Stewarts Purchase, MD

Average rainfall days in September - Stewarts Purchase, MD
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is November (9.4 days).

Average snowfall in September
Stewarts Purchase, MD

Average snowfall in September - Stewarts Purchase, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Stewarts Purchase, MD

Average snowfall days in September - Stewarts Purchase, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.4 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
Stewarts Purchase, MD

Average daylight in September / Average sunshine in September - Stewarts Purchase, 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 54min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

Average sunshine days in September
Stewarts Purchase, MD

Average sunshine days in September - Stewarts Purchase, MD
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (10.8 days).

Average UV index in September
Stewarts Purchase, MD

Average UV index in September - Stewarts Purchase, 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
Stewarts Purchase, MD

Average cloud cover in September - Stewarts Purchase, MD
  • Average cloud cover in September: 34

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September
Stewarts Purchase, MD

Average visibility in September - Stewarts Purchase, 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).

Stewarts Purchase, Maryland, USA

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