August weather forecastRoche Harbor, WA
August
Weather in August
August, the last month of the summer in Roche Harbor, is another comfortable month, with an average temperature varying between 57.7°F (14.3°C) and 64.4°F (18°C).Temperature
Roche Harbor's August average high-temperature settles at a still comfortable 64.4°F (18°C), showing a near match with the preceding month. Roche Harbor registers a subtle dip to an average of 57.7°F (14.3°C) during the nights of August.Humidity
January, August and September, with an average relative humidity of 79%, are the most humid months.Rainfall
In Roche Harbor, in August, during 5.3 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. In Roche Harbor, during the entire year, the rain falls for 167.7 days and collects up to 23.46" (596mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In August, the average length of the day is 14h and 17min.On the first day of August, sunrise is at 5:48 am and sunset at 8:49 pm. On the last day of the month, sunrise is at 6:29 am and sunset at 7:55 pm PDT.
Sunshine
In August, the average sunshine is 10.8h.UV index
The average daily maximum UV index in August is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In August, a daily maximum UV index of 4 leads to the following instructions:
Take precautions - Protection against skin and eye damage is obliged. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Roche Harbor, WA
- Average high temperature in August: 64.4°F
The warmest month (with the highest average high temperature) is July (64.9°F).
The months with the lowest average high temperature are January, February and December (45.3°F).
- Average low temperature in August: 57.7°F
The month with the highest average low temperature is August (57.7°F).
The coldest month (with the lowest average low temperature) is February (40.5°F).
Average pressure in August
Roche Harbor, WA
- Average pressure in August: 30.02"Hg
The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).
Average wind speed in August
Roche Harbor, WA
- Average wind speed in August: 4.9mph
The windiest month (with the highest average wind speed) is November (10.7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in August
Roche Harbor, WA
- Average humidity in August: 79%
The months with the highest relative humidity are January, August and September (79%).
The month with the lowest relative humidity is April (76%).
Average rainfall in August
Roche Harbor, WA
- Average rainfall in August: 0.71"
The wettest month (with the highest rainfall) is November (3.43").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in August
Roche Harbor, WA
- Average rainfall days in August: 5.3 days
The month with the highest number of rainy days is March (20.2 days).
The month with the least rainy days is August (5.3 days).
Average snowfall in August
Roche Harbor, WA
- Average snowfall in August: 0"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in August
Roche Harbor, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (2.7 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
Roche Harbor, WA
- Average daylight in August: 14h and 18min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in August: 10h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days in August
Roche Harbor, WA
- Average sunshine days in August: 24.7 days
The month with the most sunshine days is August (24.7 days).
The month with the least sunshine days is November (8.7 days).
Average UV index in August
Roche Harbor, 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, November and December (UV index 2).
Average cloud cover in August
Roche Harbor, WA
- Average cloud cover in August: 23
The months with the most cloud cover are February and December (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 23).
Average visibility in August
Roche Harbor, WA
- 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).
