August weather forecastIndex, WA
August
Weather in August
The last month of the summer, August, is a warm month in Index, Washington, with an average temperature fluctuating between 48°F (8.9°C) and 73.4°F (23°C).Temperature
Temperature records mark August as the warmest month, with highs averaging 73.4°F (23°C) and lows at 48°F (8.9°C).Humidity
The average relative humidity in August in Index is 73%.Rainfall
The month with the least rainfall in Index is August, when the rain falls for 7.9 days and typically collects 0.79" (20mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In August, the average length of the day is 14h and 13min.On the first day of the month, sunrise is at 5:44 am and sunset at 8:40 pm. On the last day of August, sunrise is at 6:24 am and sunset at 7:48 pm PDT.
Sunshine
The month with the most sunshine is August, with an average of 10.4h of sunshine.UV index
In August, the average daily maximum UV index in Index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 in August translates into this advice:
Guard yourself - Precautionary measures against sun damage are advocated. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Index, WA
- Average high temperature in August: 73.4°F
The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in August: 48°F
The month with the highest average low temperature is August (48°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure in August
Index, WA
- Average pressure in August: 29.99"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in August
Index, WA
- Average wind speed in August: 3.2mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in August
Index, WA
- Average humidity in August: 73%
The months with the highest relative humidity are January, February and March (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in August
Index, WA
- Average rainfall in August: 0.79"
The wettest month (with the highest rainfall) is January (7.8").
The driest month (with the least rainfall) is August (0.79").
Average rainfall days in August
Index, WA
- Average rainfall days in August: 7.9 days
The month with the highest number of rainy days is March (22.3 days).
The month with the least rainy days is August (7.9 days).
Average snowfall in August
Index, WA
- Average snowfall in August: 0"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in August
Index, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (5.2 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
Index, WA
- Average daylight in August: 14h and 12min
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: 10h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in August
Index, WA
- Average sunshine days in August: 19.9 days
The month with the most sunshine days is August (19.9 days).
The month with the least sunshine days is March (7 days).
Average UV index in August
Index, WA
- Average UV index in August: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in August
Index, WA
- Average cloud cover in August: 30
The months with the most cloud cover are March and December (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in August
Index, WA
- Average visibility in August: 5mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
