September weather forecast
Sandy Spring, MD

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Weather in September

September, the first month of the autumn in Sandy Spring, is also a moderately hot month, with an average temperature varying between 78.1°F (25.6°C) and 60.8°F (16°C).

Temperature

The arrival of September is marked by a minor reduction in average high-temperature, sliding from a warm 84.9°F (29.4°C) in August to a still moderately hot 78.1°F (25.6°C). In the month of September, Sandy Spring records a consistent average low-temperature of 60.8°F (16°C).

Humidity

The average relative humidity in September is 74%.

Rainfall

In September, the rain falls for 12.5 days. Throughout September, 2.24" (57mm) of precipitation is accumulated. In Sandy Spring, during the entire year, the rain falls for 160.9 days and collects up to 32.99" (838mm) of precipitation.

Snowfall

In Sandy Spring, snow does not fall in May through October.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of September, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

Sunshine

In September, the average sunshine is 8.9h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Updated: Jun 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

September temperatures vary between a high-temperature of 78.1°F (25.6°C) and a low-temperature of 60.8°F (16°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is evaluated at 93.2°F (34°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

How much does it rain in September?

In Sandy Spring, during September, the rain falls for 12.5 days and regularly aggregates up to 2.24" (57mm) of precipitation.

When it does not snow?

In Sandy Spring, snow does not fall in May through October.

How many hours of daylight does Sandy Spring have in September?

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

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:37 am and sunset at 7:38 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 Sandy Spring, the average sunshine duration in September is 8.9h.

What is the UV index intensity in September?

In Sandy Spring, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability 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
Sandy Spring, MD

Average temperature in September - Sandy Spring, MD
  • Average high temperature in September: 78.1°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39°F).

  • Average low temperature in September: 60.8°F

The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in September
Sandy Spring, MD

Average pressure in September - Sandy Spring, 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 (29.95"Hg).

Average wind speed in September
Sandy Spring, MD

Average wind speed in September - Sandy Spring, MD
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in September
Sandy Spring, MD

Average humidity in September - Sandy Spring, MD
  • Average humidity in September: 74%

The months with the highest relative humidity are May, October and December (76%).
The month with the lowest relative humidity is July (70%).

Average rainfall in September
Sandy Spring, MD

Average rainfall in September - Sandy Spring, MD
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in September
Sandy Spring, MD

Average rainfall days in September - Sandy Spring, MD
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in September
Sandy Spring, MD

Average snowfall in September - Sandy Spring, MD
  • Average snowfall in September: 0"

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

Average snowfall days in September
Sandy Spring, MD

Average snowfall days in September - Sandy Spring, MD
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (5.1 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
Sandy Spring, MD

Average daylight in September / Average sunshine in September - Sandy Spring, 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: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in September
Sandy Spring, MD

Average sunshine days in September - Sandy Spring, MD
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is November (19.4 days).
The months with the least sunshine days are May and July (11 days).

Average UV index in September
Sandy Spring, MD

Average UV index in September - Sandy Spring, 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
Sandy Spring, MD

Average cloud cover in September - Sandy Spring, MD
  • Average cloud cover in September: 37

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in September
Sandy Spring, MD

Average visibility in September - Sandy Spring, 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).

Sandy Spring, Maryland, USA

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