September weather forecast
Sylvan Hill, MD

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Sylvan Hill, Maryland, with an average temperature fluctuating between 60.4°F (15.8°C) and 76.8°F (24.9°C).

Temperature

September witnesses a gentle descent in average high-temperature, descending from August's 83.5°F (28.6°C) to a still warm 76.8°F (24.9°C). Nighttime temperatures in September average to a refreshing 60.4°F (15.8°C).

Humidity

The average relative humidity in September is 75%.

Rainfall

In Sylvan Hill, in September, during 13.1 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. Throughout the year, in Sylvan Hill, there are 165.5 rainfall days, and 31.65" (804mm) of precipitation is accumulated.

Snowfall

In Sylvan Hill, snow does not fall in May through October.

Daylight

In Sylvan Hill, 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 7:02 am and sunset at 6:50 pm EDT.

Sunshine

In Sylvan Hill, the average sunshine in September is 9.1h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Exercise prevention - Warding off sunburn is urged. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

Frequently asked questions

What is the temperature in September?

During September, Sylvan Hill experiences an average high-temperature of 76.8°F (24.9°C) and a low-temperature of 60.4°F (15.8°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 75%.

How many days does it rain in September?

In Sylvan Hill, in September, during 13.1 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Sylvan Hill have 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, sunrise is at 6:36 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:50 pm EDT.

How many hours of sunshine does Sylvan Hill have in September?

In Sylvan Hill, the average sunshine duration in September is 9.1h.

What is the UV index reading in September?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk 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
Sylvan Hill, MD

Average temperature in September - Sylvan Hill, MD
  • Average high temperature in September: 76.8°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 (38.1°F).

  • Average low temperature in September: 60.4°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
Sylvan Hill, MD

Average pressure in September - Sylvan Hill, 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
Sylvan Hill, MD

Average wind speed in September - Sylvan Hill, MD
  • Average wind speed in September: 6.2mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in September
Sylvan Hill, MD

Average humidity in September - Sylvan Hill, MD
  • Average humidity in September: 75%

The months with the highest relative humidity are May and October (77%).
The month with the lowest relative humidity is July (71%).

Average rainfall in September
Sylvan Hill, MD

Average rainfall in September - Sylvan Hill, MD
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is August (3.74").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in September
Sylvan Hill, MD

Average rainfall days in September - Sylvan Hill, MD
  • Average rainfall days in September: 13.1 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (9.7 days).

Average snowfall in September
Sylvan Hill, MD

Average snowfall in September - Sylvan Hill, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Sylvan Hill, MD

Average snowfall days in September - Sylvan Hill, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.9 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
Sylvan Hill, MD

Average daylight in September / Average sunshine in September - Sylvan Hill, 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 month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in September
Sylvan Hill, MD

Average sunshine days in September - Sylvan Hill, MD
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.4 days).

Average UV index in September
Sylvan Hill, MD

Average UV index in September - Sylvan Hill, 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
Sylvan Hill, MD

Average cloud cover in September - Sylvan Hill, 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
Sylvan Hill, MD

Average visibility in September - Sylvan Hill, 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).

Sylvan Hill, Maryland, USA

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