September weather forecastBrush Prairie, WA
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Brush Prairie, Washington, with an average temperature fluctuating between 49.1°F (9.5°C) and 71.6°F (22°C).Temperature
The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a moderately hot 79.3°F (26.3°C) in August to an agreeable 71.6°F (22°C). The significant decline in Brush Prairie's temperature, from day to night, averages of 49.1°F (9.5°C) in September.Humidity
The average relative humidity in September in Brush Prairie is 72%.Rainfall
In Brush Prairie, during September, the rain falls for 10.5 days and regularly aggregates up to 2.01" (51mm) of precipitation. In Brush Prairie, Washington, during the entire year, the rain falls for 177.9 days and collects up to 40.67" (1033mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September in Brush Prairie, sunrise is at 6:32 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:51 pm PDT.
Sunshine
In September, the average sunshine in Brush Prairie is 9h.UV index
In September, the average daily maximum UV index in Brush Prairie, Washington, is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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
Brush Prairie, 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).
