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
August, having an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 50°F (10°C), is the warmest month.Humidity
The average relative humidity in August is 74%.Rainfall
In August, the rain falls for 6.4 days. Throughout August, 0.55" (14mm) of precipitation is accumulated. In Chehalis, during the entire year, the rain falls for 185.5 days and collects up to 36.1" (917mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in August is 14h and 8min.On the first day of the month, sunrise is at 5:53 am and sunset at 8:42 pm. On the last day of August, sunrise is at 6:31 am and sunset at 7:52 pm PDT.
Sunshine
August has the most sunshine of the year, with an average of 10.2h of sunshine.UV index
The average daily maximum UV index in August is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: A daily maximum UV index of 4 in August translates into the following instructions:
Be vigilant - Suggestions to stave off sun damage are provided. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the hottest time of year?
What is the temperature in August in Chehalis?
What is the average humidity in August?
How much does it rain in August?
When it does not snow?
What is the average length of the day in August?
What time are sunrise and sunset in August?
What month has the most sunshine?
How long on average sun shines in August?
How high is the UV index in August?
Average temperature in August
Chehalis, WA
- Average high temperature in August: 77.5°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in August: 50°F
The month with the highest average low temperature is August (50°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).
Average pressure in August
Chehalis, WA
- Average pressure in August: 30.02"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.02"Hg).
Average wind speed in August
Chehalis, WA
- Average wind speed in August: 3.7mph
The windiest months (with the highest average wind speed) are January, March and November (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.6mph).
Average humidity in August
Chehalis, WA
- Average humidity in August: 74%
The months with the highest relative humidity are January, February, November and December (89%).
The month with the lowest relative humidity is July (73%).
Average rainfall in August
Chehalis, WA
- Average rainfall in August: 0.55"
The wettest month (with the highest rainfall) is January (5.51").
The driest month (with the least rainfall) is July (0.47").
Average rainfall days in August
Chehalis, WA
- Average rainfall days in August: 6.4 days
The month with the highest number of rainy days is March (21.5 days).
The month with the least rainy days is August (6.4 days).
Average snowfall in August
Chehalis, WA
- Average snowfall in August: 0"
The month with the highest snowfall is February (1.93").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in August
Chehalis, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (3.5 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
Chehalis, WA
- Average daylight in August: 14h and 1min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in August: 10h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).
Average sunshine days in August
Chehalis, WA
- Average sunshine days in August: 20.8 days
The months with the most sunshine days are July and August (20.8 days).
The month with the least sunshine days is February (7.6 days).
Average UV index in August
Chehalis, 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
Chehalis, WA
- Average cloud cover in August: 38
The months with the most cloud cover are January, February and December (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in August
Chehalis, WA
- Average visibility in August: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
Chehalis, Washington, USA
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