Annapolis
Maryland, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Annapolis, MD

A view of Chesapeake Bay at dusk, in Annapolis, Maryland, with a distant view of the US Naval Academy chapel dome
A view of Chesapeake Bay at dusk, in Annapolis, Maryland, with a distant view of the US Naval Academy chapel dome
August, the last month of the summer, in Annapolis, is also a moderately hot month, with temperature in the range of an average low of 70.5°F (21.4°C) and an average high of 83.3°F (28.5°C).

Temperature

In Annapolis, Maryland, the average high-temperature is essentially the same as in July - a still warm 83.3°F (28.5°C). The average low-temperature, is 70.5°F (21.4°C).

Heat index

In August, the average heat index is estimated at a tropical 90.1°F (32.3°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, wind, differences in body mass, height, and shape, and pregnancy affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in Annapolis, Maryland, is 74%.

Rainfall

The month with the most rainfall in Annapolis, Maryland, is August when the rain falls for 14.3 days and typically aggregates up to 1.69" (43mm) of precipitation.

Snowfall

In Annapolis snow does not fall in April through October.

Ocean temperature

The month with the warmest seawater in Annapolis is August, with an average ocean temperature of 77.7°F (25.4°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Annapolis, the average length of the day in August is 13.6h.

Sunshine

The average sunshine in Annapolis is 10.5h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in August in Annapolis?

In Annapolis, Maryland, in August, the average high-temperature is 83.3°F (28.5°C), and the average low-temperature is 70.5°F (21.4°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), that combines relative humidity and air temperature, is calculated to 90.1°F (32.3°C).

What is the average humidity in August in Annapolis?

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

How many days does it rain in August in Annapolis?

In Annapolis, Maryland, during August, the rain falls for 14.3 days and regularly aggregates up to 1.69" (43mm) of precipitation.

What is the rainiest month in Annapolis?

August is the month with the most rainfall. Rain falls for 14.3 days and accumulates 1.69" (43mm) of precipitation.

When it does not snow in Annapolis?

In Annapolis snow does not fall in April through October.

When is the ocean warmest in Annapolis?

With an average ocean temperature of 77.7°F (25.4°C), August is the month with the warmest seawater in Annapolis, Maryland.

What is the ocean temperature in August in Annapolis?

In Annapolis, Maryland, the average seawater temperature in August is 77.7°F (25.4°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Annapolis have in August?

In August, the average length of the day in Annapolis is 13.6h.

How long on average sun shines in August in Annapolis?

In August, the average sunshine in Annapolis is 10.5h.

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

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

What is the UV index reading in August in Annapolis?

In Annapolis, the average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays.
Average temperature in August - Annapolis, MD
  • Average high temperature in August: 28.5°C

The warmest month (with the highest average high temperature) is July (29.3°C).
The month with the lowest average high temperature is January (4.6°C).

  • Average low temperature in August: 21.4°C

The month with the highest average low temperature is July (22.2°C).
The coldest month (with the lowest average low temperature) is January (-1.2°C).

Average humidity in August - Annapolis, MD
  • Average humidity in August: 74%

The month with the highest relative humidity is May (78%).
Months with the lowest relative humidity are January, March, April and November (72%).

Average rainfall in August - Annapolis, MD
  • Average rainfall in August: 43mm

The wettest month (with the highest rainfall) is August (43mm).
The driest month (with the lowest rainfall) is January (12mm).

Average rainfall days in August - Annapolis, MD
  • Average rainfall days in August: 14.3 days

Months with the highest number of rainy days are July and August (14.3 days).
The month with the lowest number of rainy days is November (5.3 days).

Average snowfall in August - Annapolis, MD
  • Average snowfall in August: 0mm

The month with the highest snowfall is January (17mm).
Months with the lowest snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in August - Annapolis, MD
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (2.5 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in August - Annapolis, MD
  • Average sea temperature in August: 25.4°C

The best month for swimming (with the highest average sea temperature) is August (25.4°C).
The coldest month (with the lowest average sea temperature) is February (7.3°C).

Average daylight in August / Average sunshine in August - Annapolis, MD
  • Average daylight in August: 13.6h

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

  • Average sunshine in August: 10.5h

The month with most sunshine is July (Average sunshine: 10.8h).
The month with least sunshine is February (Average sunshine: 5h).

Average UV index in August - Annapolis, MD
  • Average UV index in August: 6

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February and December (UV index 2).