Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
As Grand Coulee transitions into August, the average high-temperature stands at a still moderately hot 84.2°F (29°C), offering little variation from the preceding month. August presents a pronounced divergence from daily peak temperatures in Grand Coulee, with the average low-temperature of 61.3°F (16.3°C).Humidity
The least humid month is August, with an average relative humidity of 36%.Rainfall
The months with the least rainfall in Grand Coulee are July and August Rain falls for 3.2 days and accumulates 0.2" (5mm) of rain.Snowfall
In Grand Coulee, snow does not fall in May through August.Daylight
In August, the average length of the day is 14h and 14min.On the first day of August, sunrise is at 5:33 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 7:38 pm PDT.
Sunshine
August has the most sunshine of the year in Grand Coulee, with an average of 12.1h of sunshine.UV index
In August, the average daily maximum UV index in Grand Coulee is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In August, the average maximum UV index of 5 translates into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
How hot does it get in Grand Coulee in August?
What is the least humid month in Grand Coulee?
What is the average humidity in August in Grand Coulee?
What is the driest month in Grand Coulee?
How many days does it rain in August in Grand Coulee?
When it does not snow in Grand Coulee?
Does it snow in Grand Coulee in August?
What is the average length of the day in August in Grand Coulee?
What time are sunrise and sunset in August in Grand Coulee?
What month has the most sunshine in Grand Coulee?
How many hours of sunshine does Grand Coulee have in August?
How high is the UV index in August in Grand Coulee?
Average temperature in August
Grand Coulee, WA
- Average high temperature in August: 84.2°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (31.6°F).
- Average low temperature in August: 61.3°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (21.4°F).
Average pressure in August
Grand Coulee, WA
- Average pressure in August: 29.91"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in August
Grand Coulee, WA
- Average wind speed in August: 5.7mph
The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).
Average humidity in August
Grand Coulee, WA
- Average humidity in August: 36%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (36%).
Average rainfall in August
Grand Coulee, WA
- Average rainfall in August: 0.2"
The wettest months (with the highest rainfall) are May and December (1.18").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days in August
Grand Coulee, WA
- Average rainfall days in August: 3.2 days
The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is August (3.2 days).
Average snowfall in August
Grand Coulee, WA
- Average snowfall in August: 0"
The month with the highest snowfall is January (4.41").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in August
Grand Coulee, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is December (10.5 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in August /
Average sunshine in August
Grand Coulee, WA
- Average daylight in August: 14h and 1min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in August: 12h and 1min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in August
Grand Coulee, WA
- Average sunshine days in August: 25.8 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is March (14.7 days).
Average UV index in August
Grand Coulee, WA
- Average UV index in August: 5
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in August
Grand Coulee, WA
- Average cloud cover in August: 12
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in August
Grand Coulee, WA
- Average visibility in August: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Grand Coulee, Washington, USA
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