August weather forecastMountain Brook, WA
August
Weather in August
The last month of the summer, August, is also a moderately hot month in Mountain Brook, Washington, with an average temperature varying between 52.3°F (11.3°C) and 78.6°F (25.9°C).Temperature
In Mountain Brook, August is the month with the highest recorded average temperatures, measuring a high of 78.6°F (25.9°C) and a low of 52.3°F (11.3°C).Humidity
July and August, with an average relative humidity of 58%, are the least humid months.Rainfall
In August, the rain falls for 3.8 days. Throughout August, 0.35" (9mm) of precipitation is accumulated. Throughout the year, in Mountain Brook, there are 152.5 rainfall days, and 26.93" (684mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Mountain Brook.Daylight
In August, the average length of the day is 14h and 4min.On the first day of the month, sunrise is at 5:49 am and sunset at 8:34 pm. On the last day of August, in Mountain Brook, sunrise is at 6:26 am and sunset at 7:44 pm PDT.
Sunshine
In August, the average sunshine in Mountain Brook is 11.7h.UV index
In August, the average daily maximum UV index in Mountain Brook is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 5 during August leads to these advisories:
Prioritize safety - Recommendations to avert sunburn are shared. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Mountain Brook, WA
- Average high temperature in August: 78.6°F
The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (35.2°F).
- Average low temperature in August: 52.3°F
The month with the highest average low temperature is August (52.3°F).
The coldest month (with the lowest average low temperature) is December (26.1°F).
Average pressure in August
Mountain Brook, WA
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in August
Mountain Brook, WA
- Average wind speed in August: 5.6mph
The windiest month (with the highest average wind speed) is June (6.4mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in August
Mountain Brook, WA
- Average humidity in August: 58%
The months with the highest relative humidity are January, February and December (88%).
The months with the lowest relative humidity are July and August (58%).
Average rainfall in August
Mountain Brook, WA
- Average rainfall in August: 0.35"
The wettest month (with the highest rainfall) is January (4.88").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in August
Mountain Brook, WA
- Average rainfall days in August: 3.8 days
The month with the highest number of rainy days is March (19.4 days).
The month with the least rainy days is August (3.8 days).
Average snowfall in August
Mountain Brook, WA
- Average snowfall in August: 0"
The month with the highest snowfall is January (6.22").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in August
Mountain Brook, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is December (6.5 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
Mountain Brook, WA
- Average daylight in August: 14h and 6min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in August: 11h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in August
Mountain Brook, WA
- Average sunshine days in August: 24.8 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in August
Mountain Brook, WA
- Average UV index in August: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in August
Mountain Brook, WA
- Average cloud cover in August: 15
The months with the most cloud cover are January and February (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in August
Mountain Brook, WA
- Average visibility in August: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (4mi).
