Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's arrival correlates with a reduction in the average high-temperature, down from a warm 83.1°F (28.4°C) in August to a pleasant 72°F (22.2°C). A significant temperature decrease to an average a fresh 50°F (10°C) characterizes Brownstown's nighttime temperatures during September.Humidity
The average relative humidity in September in Brownstown is 53%.Rainfall
In September, in Brownstown, the rain falls for 6.5 days. Throughout September, 0.47" (12mm) of precipitation is accumulated. In Brownstown, Washington, during the entire year, the rain falls for 112.8 days and collects up to 10.28" (261mm) of precipitation.Snowfall
Months with snowfall in Brownstown are January through April, September, November and December. September is the first month it typically snows in Brownstown. Throughout September, in the average 0.1 snowfall days, it receives 0.16" (4mm) of snow. In Brownstown, during the entire year, snow falls for 19.9 days and aggregates up to 12.36" (314mm) of snow.Daylight
In September, the average length of the day in Brownstown is 12h and 32min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:40 pm. On the last day of September, in Brownstown, sunrise is at 7:00 am and sunset at 6:43 pm PDT.
Sunshine
The average sunshine in September is 10.9h.UV index
In Brownstown, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk 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:
Act with care - Obligation to protect against skin and eye damage is highlighted. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Enhance your sun protection with tightly woven, yet airy clothing. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Frequently asked questions
What is the temperature in September in Brownstown?
What is the average humidity in September in Brownstown?
How much does it rain in Brownstown in September?
When does it start to snow in Brownstown?
What is the average length of the day in September in Brownstown?
When are sunrise and sunset in September in Brownstown?
How many hours of sunshine does Brownstown have in September?
What is the UV index reading in September in Brownstown?
Average temperature in September
Brownstown, WA
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is August (83.1°F).
The month with the lowest average high temperature is December (35.2°F).
- Average low temperature in September: 50°F
The month with the highest average low temperature is August (56.8°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).
Average pressure in September
Brownstown, WA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed in September
Brownstown, WA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is December (4.5mph).
Average humidity in September
Brownstown, WA
- Average humidity in September: 53%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Brownstown, WA
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is January (1.61").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days in September
Brownstown, WA
- Average rainfall days in September: 6.5 days
The month with the highest number of rainy days is March (13.7 days).
The month with the least rainy days is July (3.1 days).
Average snowfall in September
Brownstown, WA
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (3.5").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in September
Brownstown, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (5.5 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Brownstown, WA
- Average daylight in September: 12h and 3min
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: 10h and 5min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Brownstown, WA
- Average sunshine days in September: 21.1 days
The month with the most sunshine days is July (25.9 days).
The month with the least sunshine days is February (12.6 days).
Average UV index in September
Brownstown, 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
Brownstown, WA
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in September
Brownstown, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Brownstown, Washington, USA
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