September weather forecast
Washington Grove, MD

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Weather in September

September, the first month of the autumn in Washington Grove, is also a moderately hot month, with an average temperature ranging between max 77.7°F (25.4°C) and min 59.9°F (15.5°C).

Temperature

The onset of September results in a small decrease in the average high-temperature, moderately receding from a moderately hot 84.6°F (29.2°C) in August to a still warm 77.7°F (25.4°C). Washington Grove in September anticipates an average nighttime temperature of 59.9°F (15.5°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

In Washington Grove, in September, it is raining for 12.9 days, with typically 1.97" (50mm) of accumulated precipitation. In Washington Grove, during the entire year, the rain falls for 154.8 days and collects up to 29.09" (739mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

Sunshine

The average sunshine in September is 9h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index, 5 during September, leads to the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.

Frequently asked questions

What are September temperatures in Washington Grove?

In September, the average high-temperature and low-temperature are 77.7°F (25.4°C) and 59.9°F (15.5°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is estimated at 93.2°F (34°C).

What is the average humidity in September?

In September, the average relative humidity is 75%.

How much does it rain in September?

In September, the rain falls for 12.9 days. Throughout September, 1.97" (50mm) of precipitation is accumulated.

When it does not snow?

June through October are months without snowfall.

What is the average length of the day in September?

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 6:38 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

How many hours of sunshine does Washington Grove have in September?

In September, the average sunshine duration is 9h.

What is the UV index reading in September in Washington Grove?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents 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
Washington Grove, MD

Average temperature in September - Washington Grove, MD
  • Average high temperature in September: 77.7°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in September
Washington Grove, MD

Average pressure in September - Washington Grove, 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
Washington Grove, MD

Average wind speed in September - Washington Grove, MD
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in September
Washington Grove, MD

Average humidity in September - Washington Grove, MD
  • Average humidity in September: 75%

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

Average rainfall in September
Washington Grove, MD

Average rainfall in September - Washington Grove, MD
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is August (3.82").
The driest month (with the least rainfall) is January (1.73").

Average rainfall days in September
Washington Grove, MD

Average rainfall days in September - Washington Grove, MD
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (8.7 days).

Average snowfall in September
Washington Grove, MD

Average snowfall in September - Washington Grove, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.76").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Washington Grove, MD

Average snowfall days in September - Washington Grove, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Washington Grove, MD

Average daylight in September / Average sunshine in September - Washington Grove, 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 0min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).

Average sunshine days in September
Washington Grove, MD

Average sunshine days in September - Washington Grove, MD
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.5 days).

Average UV index in September
Washington Grove, MD

Average UV index in September - Washington Grove, 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
Washington Grove, MD

Average cloud cover in September - Washington Grove, MD
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in September
Washington Grove, MD

Average visibility in September - Washington Grove, 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).

Washington Grove, Maryland, USA

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