August weather forecast
Wilmington, DE

Today
Tomorrow
Long-term
YearJFMAMJJAugustSOND
°Celsius°Fahrenheit
Share

Contents

Bright neon lights light up the Central Business District of Wilmington, Delaware, with a scenic reflection in the Christian River
Bright neon lights light up the Central Business District of Wilmington, Delaware, with a scenic reflection in the Christian River

Weather in August

August in Wilmington presents a continuation of the summer heat with slightly lower temperatures than the preceding month, and considerable daylight. The most rainfall seen this year showers down in August, with 4.09" (104mm) collected. With its high precipitation, it contrasts with the significantly dryer months that tend to follow in the latter part of the year. A downward trend in sea temperature can be anticipated as September takes over, bringing along early hints of the transitioning season.

Temperature

The arrival of August brings an average high-temperature of a still warm 82.9°F (28.3°C), subtly diverging from July's 84.9°F (29.4°C). Wilmington experiences a steady low-temperature of 66.7°F (19.3°C) throughout August.

Heat index

The heat index value during August is evaluated at a tropical 89.6°F (32°C). With constant exposure and activity, a state of weariness might ensue, leading to potential heat cramps.
Note that heat index values are valued for light wind and location in the shade. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.

Humidity

In August, the average relative humidity in Wilmington is 74%.

Rainfall

August is the month with the most rainfall. Rain falls for 17.3 days and accumulates 4.09" (104mm) of precipitation.

Snowfall

In Wilmington, snow does not fall in June through September.

Ocean temperature

August is the month with the warmest seawater in Wilmington, with an average ocean temperature of 73.4°F (23°C).
Note: Swimming in 73.4°F (23°C) water can be enjoyable based on one's cold tolerance and conditions like sunshine, wind, and ambient temperature. (Olympic swimmers compete in waters between 77°F (25°C) and 82.4°F (28°C).)

Daylight

In Wilmington, Delaware, the average length of the day in August is 13h and 41min.
On the first day of the month, sunrise is at 6:01 am and sunset at 8:15 pm. On the last day of August, in Wilmington, sunrise is at 6:29 am and sunset at 7:34 pm EDT.

Sunshine

The average sunshine in August in Wilmington is 10.1h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 6 during August translates into the following guidance:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Caution! The reflection of sand and water significantly amplifies the Sun's UV radiation.
[Resources]

Frequently asked questions

Is it hot in Wilmington during August?

The average high-temperature, in August, in Wilmington, is 82.9°F (28.3°C), while the average low-temperature is 66.7°F (19.3°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is evaluated at 89.6°F (32°C).

What is the average humidity in August in Wilmington?

In August, the average relative humidity is 74%.

What is the rainiest month in Wilmington?

August is the month with the most rainfall in Wilmington. Rain falls for 17.3 days and accumulates 4.09" (104mm) of precipitation.

How many days does it rain in August in Wilmington?

In Wilmington, Delaware, in August, during 17.3 rainfall days, 4.09" (104mm) of precipitation is typically accumulated.

When it does not snow in Wilmington?

In Wilmington, Delaware, snow does not fall in June through September.

What month is the ocean warmest in Wilmington?

August is the month with the warmest seawater in Wilmington, Delaware, with an average ocean temperature of 73.4°F (23°C).

How warm is the water in August in Wilmington?

In Wilmington, in August, the average water temperature is 73.4°F (23°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 73.4°F (23°C) water.

What is the average length of the day in August in Wilmington?

In Wilmington, the average day length in August is 13h and 41min.

When is the sunrise / sunset in August in Wilmington?

On the first day of August in Wilmington, sunrise is at 6:01 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 6:29 am and sunset at 7:34 pm EDT.

How many hours of sunshine does Wilmington have in August?

In August, the average sunshine duration in Wilmington, Delaware, is 10.1h.

What is the month with the highest UV index in Wilmington?

May through August, with an average maximum UV index of 6, are months with the highest UV index in Wilmington.

How high is the UV index in August in Wilmington?

In August, the average daily maximum UV index in Wilmington, Delaware, is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJAugustSOND
Jul
August
Sep
Average high temperature
84.9°F 29.4°C
82.9°F 28.3°C
76.3°F 24.6°C
Average low temperature
68.4°F 20.2°C
66.7°F 19.3°C
59.9°F 15.5°C
Average pressure
29.96" 761mmHg
29.99" 762mmHg
30.05" 763mmHg
Average wind speed
5.5mph 8.9km/h
5.4mph 8.7km/h
5.8mph 9.3km/h
Average max. wind speed
6mph 9.7km/h
5.9mph 9.5km/h
6.1mph 9.8km/h
Average wind speed gusts
8.5mph 13.7km/h
8.3mph 13.4km/h
9.1mph 14.6km/h
Average humidity
74%
74%
77%
Average rainfall
3.58" 91mm
4.09" 104mm
2.4" 61mm
Average rainfall days
18.5
17.3
13.3
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
70°F 21.1°C
73°F 22.8°C
70°F 21.1°C
Average daylight
14h 4min
13h 4min
12h 2min
Average sunshine
10h 4min
10h 1min
8h 5min
Average sunshine days
9.8
11
14.2
Average UV index
6
6
4
Average cloud cover
31%
33%
37%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in August
Wilmington, DE

Average temperature in August - Wilmington, DE
  • Average high temperature in August: 82.9°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in August: 66.7°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).

[Resources]

Average pressure in August
Wilmington, DE

Average pressure in August - Wilmington, DE
  • Average pressure in August: 29.99"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

[Resources]

Average wind speed in August
Wilmington, DE

Average wind speed in August - Wilmington, DE
  • Average wind speed in August: 5.4mph

The windiest months (with the highest average wind speed) are January, February and March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

[Resources]

Average humidity in August
Wilmington, DE

Average humidity in August - Wilmington, DE
  • Average humidity in August: 74%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).

[Resources]

Average rainfall in August
Wilmington, DE

Average rainfall in August - Wilmington, DE
  • Average rainfall in August: 4.09"

The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (2.36").

[Resources]

Average rainfall days in August
Wilmington, DE

Average rainfall days in August - Wilmington, DE
  • Average rainfall days in August: 17.3 days

The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is November (8.8 days).

[Resources]

Average snowfall in August
Wilmington, DE

Average snowfall in August - Wilmington, DE
  • Average snowfall in August: 0"

The month with the highest snowfall is March (3.58").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in August
Wilmington, DE

Average snowfall days in August - Wilmington, DE
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average sea temperature in August
Wilmington, DE

Average sea temperature in August - Wilmington, DE
  • Average sea temperature in August: 73°F

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (34°F).

[Resources]

Average daylight in August /
Average sunshine in August
Wilmington, DE

Average daylight in August / Average sunshine in August - Wilmington, DE
  • Average daylight in August: 13h and 4min

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 24min).

  • Average sunshine in August: 10h and 1min

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).

[Resources]

Average sunshine days in August
Wilmington, DE

Average sunshine days in August - Wilmington, DE
  • Average sunshine days in August: 11 days

The month with the most sunshine days is November (18.6 days).
The months with the least sunshine days are May and July (9.8 days).

[Resources]

Average UV index in August
Wilmington, DE

Average UV index in August - Wilmington, DE
  • Average UV index in August: 6

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).

[Resources]

Average cloud cover in August
Wilmington, DE

Average cloud cover in August - Wilmington, DE
  • Average cloud cover in August: 33

The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

[Resources]

Average visibility in August
Wilmington, DE

Average visibility in August - Wilmington, DE
  • Average visibility in August: 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).

[Resources]

Wilmington, Delaware, USA

Weather forecast for today
Weather forecast for tomorrow
10 days weather forecast
Climate data
1January
2February
3March
4April
5May
6June
7July
8August
9September
10October
11November
12December

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location