September weather forecastCedar Hills, OR
September
Weather in September
The first month of the autumn, September, is still a warm month in Cedar Hills, Oregon, with an average temperature fluctuating between 74.3°F (23.5°C) and 52°F (11.1°C).Temperature
As September arrives, Cedar Hills's weather displays a minor decrease in high-temperatures, transitioning from August's moderately hot 81.7°F (27.6°C) to a still warm 74.3°F (23.5°C). Cedar Hills sees a large disparity in day to night temperatures in September, with the night temperature dropping to an average of 52°F (11.1°C).Humidity
In September, the average relative humidity is 69%.Rainfall
In Cedar Hills, during September, the rain falls for 10.5 days and regularly aggregates up to 1.54" (39mm) of precipitation. In Cedar Hills, during the entire year, the rain falls for 173.2 days and collects up to 30.55" (776mm) of precipitation.Snowfall
In Cedar Hills, snow does not fall in April through October.Daylight
In Cedar Hills, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:33 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:52 pm PDT.
Sunshine
In September, the average sunshine is 9.2h.UV index
In September, the average daily maximum UV index in Cedar Hills is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Be vigilant - A duty to shield skin and eyes from injury exists. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cedar Hills, OR
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is August (81.7°F).
The month with the lowest average high temperature is December (44.2°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is August (55.6°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).
Average pressure in September
Cedar Hills, OR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in September
Cedar Hills, OR
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is January (5.4mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Cedar Hills, OR
- Average humidity in September: 69%
The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is August (63%).
Average rainfall in September
Cedar Hills, OR
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is December (4.61").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in September
Cedar Hills, OR
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is March (20.6 days).
The month with the least rainy days is August (4.6 days).
Average snowfall in September
Cedar Hills, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.61").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Cedar Hills, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Cedar Hills, OR
- Average daylight in September: 12h and 30min
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 12min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in September
Cedar Hills, OR
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is March (8.6 days).
Average UV index in September
Cedar Hills, OR
- 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
Cedar Hills, OR
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Cedar Hills, OR
- Average visibility in September: 6mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).
