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
Brightwood, Oregon, in September undergoes a slight reduction in the average high-temperature, shifting from August's moderately hot 77.4°F (25.2°C) to a pleasant 69.1°F (20.6°C). The average low-temperature of 47.3°F (8.5°C) in September represents a significant drop from the daily high.Humidity
In Brightwood, the average relative humidity in September is 71%.Rainfall
In September, the rain falls for 10.9 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. Throughout the year, there are 178.5 rainfall days, and 41.65" (1058mm) of precipitation is accumulated.Snowfall
June through October are months without snowfall.Daylight
In September, the average length of the day in Brightwood is 12h and 31min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:49 pm PDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In Brightwood, Oregon, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. When the Sun is at its strongest around midday, find shade and limit exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September in Brightwood?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Brightwood, OR
- Average high temperature in September: 69.1°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (40.6°F).
- Average low temperature in September: 47.3°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (30.7°F).
Average pressure in September
Brightwood, OR
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in September
Brightwood, OR
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is January (6.7mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
Brightwood, OR
- Average humidity in September: 71%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (66%).
Average rainfall in September
Brightwood, OR
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is December (6.42").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in September
Brightwood, OR
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is July (6 days).
Average snowfall in September
Brightwood, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (11.69").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Brightwood, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (8.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Brightwood, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is August (Average sunshine: 11h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in September
Brightwood, OR
- Average sunshine days in September: 17 days
The month with the most sunshine days is July (22.9 days).
The month with the least sunshine days is February (7.3 days).
Average UV index in September
Brightwood, OR
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in September
Brightwood, OR
- Average cloud cover in September: 34
The months with the most cloud cover are February and March (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Brightwood, OR
- Average visibility in September: 5mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, September, October, November and December (5mi).
Brightwood, Oregon, USA
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