August weather forecastGrass Valley, CA
August
Weather in August
August, the last month of the summer in Grass Valley, is another tropical month, with an average temperature varying between 89.2°F (31.8°C) and 59.2°F (15.1°C).Temperature
The ushering in of August brings an average high-temperature of a still tropical 89.2°F (31.8°C), closely mirroring the 90.1°F (32.3°C) of July. A significant drop from the day's peak to an average low-temperature of 59.2°F (15.1°C) is noted during the nights in August.Humidity
In Grass Valley, California, the average relative humidity in August is 38%.Rainfall
The months with the least rainfall in Grass Valley are July and August Rain falls for 1.2 days and accumulates 0.04" (1mm) of rain.Snowfall
In Grass Valley, California, snow does not fall in June through October.Daylight
In Grass Valley, the average length of the day in August is 13h and 39min.On the first day of the month, sunrise is at 6:05 am and sunset at 8:15 pm. On the last day of August, sunrise is at 6:32 am and sunset at 7:35 pm PDT.
Sunshine
In Grass Valley, the average sunshine in August is 12h.UV index
The average daily maximum UV index in August in Grass Valley is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the average person.Note: The UV index of 6 in August translates into these instructions:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Grass Valley, CA
- Average high temperature in August: 89.2°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (51.3°F).
- Average low temperature in August: 59.2°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).
Average pressure in August
Grass Valley, CA
- Average pressure in August: 29.91"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in August
Grass Valley, CA
- Average wind speed in August: 4.8mph
The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in August
Grass Valley, CA
- Average humidity in August: 38%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (37%).
Average rainfall in August
Grass Valley, CA
- Average rainfall in August: 0.04"
The wettest month (with the highest rainfall) is March (6.57").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in August
Grass Valley, CA
- Average rainfall days in August: 1.2 days
The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is July (1.1 days).
Average snowfall in August
Grass Valley, CA
- Average snowfall in August: 0"
The month with the highest snowfall is February (6.42").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in August
Grass Valley, CA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is March (2.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in August /
Average sunshine in August
Grass Valley, CA
- Average daylight in August: 13h and 42min
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: 12h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in August
Grass Valley, CA
- Average sunshine days in August: 28.7 days
The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).
Average UV index in August
Grass Valley, CA
- Average UV index in August: 6
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 2).
Average cloud cover in August
Grass Valley, CA
- Average cloud cover in August: 5
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in August
Grass Valley, CA
- 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).
