September weather forecastPrevost, WA
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Prevost, Washington, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 63°F (17.2°C).Temperature
The transition into September involves a small decrease in the average high-temperature, dipping slightly from a pleasant 68.4°F (20.2°C) in August to a comfortable 63°F (17.2°C). In the month of September, Prevost's average low-temperature falls to a fresh 53.2°F (11.8°C).Humidity
The average relative humidity in September is 79%.Rainfall
In Prevost, in September, during 4.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. Throughout the year, there are 72.5 rainfall days, and 6.42" (163mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 34min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:54 pm. On the last day of September, sunrise is at 7:12 am and sunset at 6:52 pm PDT.
Sunshine
In September, the average sunshine is 9.6h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Prevost, WA
- Average high temperature in September: 63°F
The warmest months (with the highest average high temperature) are July and August (68.4°F).
The month with the lowest average high temperature is December (43.3°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is August (56.7°F).
The coldest month (with the lowest average low temperature) is February (37.9°F).
Average pressure in September
Prevost, WA
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January and July (30.06"Hg).
The month with the lowest atmospheric pressure is March (29.99"Hg).
Average wind speed in September
Prevost, WA
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is November (7.3mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
Prevost, WA
- Average humidity in September: 79%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Prevost, WA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is January (1.46").
The driest months (with the least rainfall) are July and August (0.12").
Average rainfall days in September
Prevost, WA
- Average rainfall days in September: 4.9 days
The month with the highest number of rainy days is December (8.6 days).
The month with the least rainy days is August (2.3 days).
Average snowfall in September
Prevost, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Prevost, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 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
Prevost, WA
- Average daylight in September: 12h and 36min
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 September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The months with the least sunshine are January and December (Average sunshine: 4h and 30min).
Average sunshine days in September
Prevost, WA
- Average sunshine days in September: 24.2 days
The month with the most sunshine days is August (28.2 days).
The month with the least sunshine days is February (17.4 days).
Average UV index in September
Prevost, WA
- Average UV index in September: 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 September
Prevost, WA
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 20).
Average visibility in September
Prevost, WA
- Average visibility in September: 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).
