September weather forecastYacolt, WA
September
Weather in September
September, the first month of the autumn in Yacolt, is also an agreeable month, with an average temperature ranging between min 49.1°F (9.5°C) and max 71.6°F (22°C).Temperature
September's onset introduces a mild reduction in the average high-temperature, from a moderately hot 79.3°F (26.3°C) in August to an agreeable 71.6°F (22°C). In Yacolt, September nights witness a remarkable decline from the day's zenith to a frosty 49.1°F (9.5°C).Humidity
In Yacolt, Washington, the average relative humidity in September is 72%.Rainfall
In September, in Yacolt, the rain falls for 10.5 days. Throughout September, 2.01" (51mm) of precipitation is accumulated. Throughout the year, in Yacolt, Washington, there are 177.9 rainfall days, and 40.67" (1033mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Yacolt.Daylight
In Yacolt, the average length of the day in September is 12h and 31min.On the first day of September in Yacolt, sunrise is at 6:31 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:50 pm PDT.
Sunshine
In Yacolt, the average sunshine in September is 9h.UV index
In Yacolt, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Yacolt, WA
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).
Average pressure in September
Yacolt, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in September
Yacolt, WA
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is January (6.1mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in September
Yacolt, WA
- Average humidity in September: 72%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (67%).
Average rainfall in September
Yacolt, WA
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is January (6.06").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Yacolt, WA
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is August (5.1 days).
Average snowfall in September
Yacolt, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.76").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Yacolt, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Yacolt, WA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).
Average sunshine days in September
Yacolt, WA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is February (8.2 days).
Average UV index in September
Yacolt, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Yacolt, WA
- Average cloud cover in September: 36
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Yacolt, WA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
