September weather forecast and climate
Hawthorne, DC

The first month of the autumn, September, is still a warm month in Hawthorne, District of Columbia, with average temperature fluctuating between 78.4°F (25.8°C) and 61.7°F (16.5°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 85.6°F (29.8°C) in August, to a still warm 78.4°F (25.8°C). The average low-temperature, in Hawthorne, is 61.7°F (16.5°C).

Humidity

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

Rainfall

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

Snowfall

May through October are months without snowfall.

Daylight

In Hawthorne, the average length of the day is 12.4h.

Sunshine

The average sunshine in Hawthorne is 8.7h.

UV index

The average daily maximum UV index in Hawthorne is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.

What is the temperature in September in Hawthorne?

In September, the average high-temperature is 78.4°F (25.8°C), and the average low-temperature is 61.7°F (16.5°C).

What is the average humidity in September in Hawthorne?

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

How much does it rain in Hawthorne 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?

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

What is the average length of the day in September in Hawthorne?

In September, the average length of the day in Hawthorne, District of Columbia, is 12.4h.

How many hours of sunshine does Hawthorne have in September?

In September, the average sunshine in Hawthorne, District of Columbia, is 8.7h.

What is the UV index intensity in September in Hawthorne?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.
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: 30.05"

The month with the highest atmospheric pressure is November (30.14").
The month with the lowest atmospheric pressure is June (29.95").

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: 73%

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: 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: 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: 0"

The month with the highest snowfall is January (2.87").
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: 0 days

The month with the highest number of snowfall days is January (4.6 days).
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: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 8.7h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.9h).

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: 5

Months with the highest UV index are May, June, July and August (UV index 6).
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: 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: 6mi

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).