September weather forecast
Hawthorne, DC

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Weather in September

Come September, Hawthorne begins to lean towards autumn, and it is reflected in weather changes. A gradual dip in temperatures starts hinting at the end of the hot summer days. Visitors and locals enjoy outdoor events in the gentle embracing warmth, before the colder months start. The advent of fall brings a refreshing change to the Hawthorne life and culture. As Hawthorne stands on the threshold of a new season, the city reflects a melting pot of activities.

Temperature

September heralds a minor drop in average high-temperature, sliding from August's 85.6°F (29.8°C) to a still moderately hot 78.4°F (25.8°C). During September, Hawthorne experiences an average low-temperature of 61.7°F (16.5°C) at night.

Humidity

In Hawthorne, the average relative humidity in September is 73%.

Rainfall

In Hawthorne, in September, during 12.4 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. Throughout the year, there are 154.8 rainfall days, and 30.28" (769mm) of precipitation is accumulated.

Snowfall

In Hawthorne, 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 the month, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:52 pm EDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Make use of precautions - It is urged to ward off sun damage. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.

Frequently asked questions

What is the usual temperature for Hawthorne in September?

An average high-temperature, in September, in Hawthorne, is 78.4°F (25.8°C) and the average low-temperature is 61.7°F (16.5°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is evaluated at 95°F (35°C).

What is the average humidity in September?

The average relative humidity in September is 73%.

How many days does it rain in September?

In Hawthorne, in September, it is raining for 12.4 days, with typically 2.2" (56mm) of accumulated precipitation.

When it does not snow?

In Hawthorne, snow does not fall in May through October.

What is the average length of the day 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 6:37 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:52 pm EDT.

How many hours of sunshine does Hawthorne have in September?

The average sunshine duration in September is 8.7h.

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 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
Hawthorne, DC

Average temperature in September - Hawthorne, DC
  • Average high temperature in September: 78.4°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in September: 61.7°F

The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).

Average pressure in September
Hawthorne, DC

Average pressure in September - Hawthorne, DC
  • 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
Hawthorne, DC

Average wind speed in September - Hawthorne, DC
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in September
Hawthorne, DC

Average humidity in September - Hawthorne, DC
  • Average humidity in September: 73%

The months with the highest relative humidity are May, October and December (75%).
The month with the lowest relative humidity is July (69%).

Average rainfall in September
Hawthorne, DC

Average rainfall in September - Hawthorne, DC
  • Average rainfall in September: 2.2"

The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (1.89").

Average rainfall days in September
Hawthorne, DC

Average rainfall days in September - Hawthorne, DC
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (8.5 days).

Average snowfall in September
Hawthorne, DC

Average snowfall in September - Hawthorne, DC
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Hawthorne, DC

Average snowfall days in September - Hawthorne, DC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.6 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
Hawthorne, DC

Average daylight in September / Average sunshine in September - Hawthorne, DC
  • 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 4min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in September
Hawthorne, DC

Average sunshine days in September - Hawthorne, DC
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (12 days).

Average UV index in September
Hawthorne, DC

Average UV index in September - Hawthorne, DC
  • 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
Hawthorne, DC

Average cloud cover in September - Hawthorne, DC
  • Average cloud cover in September: 38

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in September
Hawthorne, DC

Average visibility in September - Hawthorne, DC
  • 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).

Hawthorne, District of Columbia, USA

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