September weather forecast
Rock Creek Park, MD

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Weather in September

September, the first month of the autumn in Rock Creek Park, is still a warm month, with an average temperature ranging between max 77.4°F (25.2°C) and min 63.3°F (17.4°C).

Temperature

A modest decline in the average high-temperature is seen during September, decreasing from a moderately hot 83.7°F (28.7°C) in August to a still warm 77.4°F (25.2°C). Throughout September, Rock Creek Park witnesses a consistent average low-temperature of 63.3°F (17.4°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

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

Snowfall

In Rock Creek Park, Maryland, snow does not fall in May through October.

Daylight

In Rock Creek Park, 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 7:01 am and sunset at 6:49 pm EDT.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, a daily UV index of 5 turns into the following recommendations:
Ensure safety - Recommendations to avert sunburn are presented. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.

Frequently asked questions

What are the temperatures in September?

In September, in Rock Creek Park, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 63.3°F (17.4°C). The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in August is appraised at 91.4°F (33°C).

What is the average humidity in September?

In Rock Creek Park, the average relative humidity in September is 75%.

What is the driest month in Rock Creek Park?

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 many days does it rain in September?

In Rock Creek Park, in September, it is raining for 11.8 days, with typically 1.89" (48mm) of accumulated precipitation.

When it does not snow?

May 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.

When is the sunrise / 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 7:01 am and sunset at 6:49 pm EDT.

How long on average sun shines in September?

In Rock Creek Park, the average sunshine duration in September is 9.2h.

What is the UV index reading in September?

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 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
Rock Creek Park, MD

Average temperature in September - Rock Creek Park, 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
Rock Creek Park, MD

Average pressure in September - Rock Creek Park, 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
Rock Creek Park, MD

Average wind speed in September - Rock Creek Park, 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
Rock Creek Park, MD

Average humidity in September - Rock Creek Park, 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
Rock Creek Park, MD

Average rainfall in September - Rock Creek Park, 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
Rock Creek Park, MD

Average rainfall days in September - Rock Creek Park, 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
Rock Creek Park, MD

Average snowfall in September - Rock Creek Park, 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
Rock Creek Park, MD

Average snowfall days in September - Rock Creek Park, 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
Rock Creek Park, MD

Average daylight in September / Average sunshine in September - Rock Creek Park, 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
Rock Creek Park, MD

Average sunshine days in September - Rock Creek Park, 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
Rock Creek Park, MD

Average UV index in September - Rock Creek Park, 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
Rock Creek Park, MD

Average cloud cover in September - Rock Creek Park, 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
Rock Creek Park, MD

Average visibility in September - Rock Creek Park, 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).

Rock Creek Park, Maryland, USA

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