August weather forecast
Mount Rainier, MD

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Weather in August

In August, the weather in Mount Rainier is dominated by the extended summer, delivering comparatively warm temperatures and high humidity levels. While the maximum temperature slightly decreases to 85.1°F (29.5°C) from July's peak of 87.4°F (30.8°C), the overall weather remains steady and warm. Compared to July, August has a more significant density of cloud cover and higher rainfall, increasing the chance of overcast or rainy days. Coming September, the weather of Mount Rainier undergoes noticeable changes, as the hot summer months give way to the more temperate conditions of autumn.

Temperature

As August takes its course, Mount Rainier's average high-temperature registers at a warm 85.1°F (29.5°C), closely aligning with the preceding month. Throughout August, Mount Rainier registers a consistent average low-temperature of 68.7°F (20.4°C).

Heat index

The heat index value for August is estimated at a hot 93.2°F (34°C). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', blends air temperature and moisture content to represent the felt temperature to humans. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. 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 highly critical to babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.

Humidity

The average relative humidity in August is 72%.

Rainfall

August is the month with the most rainfall. Rain falls for 15.8 days and accumulates 3.58" (91mm) of precipitation.

Snowfall

May through November are months without snowfall in Mount Rainier.

Daylight

The average length of the day in August is 13h and 38min.
On the first day of August, sunrise is at 6:09 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 7:39 pm EDT.

Sunshine

In Mount Rainier, the average sunshine in August is 10.3h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: An average UV index of 6 in August transforms into this advice:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.

Frequently asked questions

How hot is it in August?

An average high-temperature, in August, in Mount Rainier, is 85.1°F (29.5°C) and the average low-temperature is 68.7°F (20.4°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, is estimated at 93.2°F (34°C).

What is the average humidity in August?

The average relative humidity in August is 72%.

What is the rainiest month?

August is the month with the most rainfall. Rain falls for 15.8 days and accumulates 3.58" (91mm) of precipitation.

How many days does it rain in August in Mount Rainier?

In Mount Rainier, in August, it is raining for 15.8 days, with typically 3.58" (91mm) of accumulated precipitation.

When it does not snow?

In Mount Rainier, snow does not fall in May through November.

How many hours of daylight does Mount Rainier have in August?

In August, the average day length is 13h and 38min.

When are sunrise and sunset in August?

In August, on the first day of the month, sunrise is at 6:09 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 7:39 pm EDT.

How many hours of sunshine does Mount Rainier have in August?

In Mount Rainier, the average sunshine duration in August is 10.3h.

When is the highest UV index?

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

How high is the UV index in August?

In August, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.
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 August
Mount Rainier, MD

Average temperature in August - Mount Rainier, MD
  • Average high temperature in August: 85.1°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 (39.9°F).

  • Average low temperature in August: 68.7°F

The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

Average pressure in August
Mount Rainier, MD

Average pressure in August - Mount Rainier, MD
  • Average pressure in August: 29.99"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 August
Mount Rainier, MD

Average wind speed in August - Mount Rainier, MD
  • Average wind speed in August: 5.3mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in August
Mount Rainier, MD

Average humidity in August - Mount Rainier, MD
  • Average humidity in August: 72%

The months with the highest relative humidity are May, October and December (76%).
The months with the lowest relative humidity are April and July (71%).

Average rainfall in August
Mount Rainier, MD

Average rainfall in August - Mount Rainier, MD
  • Average rainfall in August: 3.58"

The wettest month (with the highest rainfall) is August (3.58").
The driest month (with the least rainfall) is January (2.01").

Average rainfall days in August
Mount Rainier, MD

Average rainfall days in August - Mount Rainier, MD
  • Average rainfall days in August: 15.8 days

The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is November (9 days).

Average snowfall in August
Mount Rainier, MD

Average snowfall in August - Mount Rainier, MD
  • Average snowfall in August: 0"

The month with the highest snowfall is January (2.6").
The months with the least snowfall are May, June, July, August, September, October and November (0").

Average snowfall days in August
Mount Rainier, MD

Average snowfall days in August - Mount Rainier, MD
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (4.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in August /
Average sunshine in August
Mount Rainier, MD

Average daylight in August / Average sunshine in August - Mount Rainier, MD
  • 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 30min).

  • Average sunshine in August: 10h and 2min

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 0min).

Average sunshine days in August
Mount Rainier, MD

Average sunshine days in August - Mount Rainier, MD
  • Average sunshine days in August: 12.8 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in August
Mount Rainier, MD

Average UV index in August - Mount Rainier, MD
  • 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 and December (UV index 2).

Average cloud cover in August
Mount Rainier, MD

Average cloud cover in August - Mount Rainier, MD
  • Average cloud cover in August: 31

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in August
Mount Rainier, MD

Average visibility in August - Mount Rainier, MD
  • 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).

Mount Rainier, Maryland, USA

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