September weather forecastSitkum, OR
September
Weather in September
September, the first month of the autumn in Sitkum, is still a pleasant month, with an average temperature varying between 70.5°F (21.4°C) and 47.8°F (8.8°C).Temperature
Sitkum sees the arrival of September with an average high-temperature of an agreeable 70.5°F (21.4°C), indicating a subtle variation from August. Sitkum documents a striking divergence from daytime highs, with an average nighttime temperature of 47.8°F (8.8°C) in September.Humidity
July through September, with an average relative humidity of 78%, are the least humid months.Rainfall
In Sitkum, during September, the rain falls for 6.7 days and regularly aggregates up to 1.06" (27mm) of precipitation. In Sitkum, during the entire year, the rain falls for 148.1 days and collects up to 30.87" (784mm) of precipitation.Snowfall
April through October and December are months without snowfall.Daylight
In Sitkum, Oregon, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:40 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:57 pm PDT.
Sunshine
The average sunshine in September is 9.7h.UV index
In Sitkum, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sitkum, OR
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is August (74.1°F).
The month with the lowest average high temperature is December (49.1°F).
- Average low temperature in September: 47.8°F
The month with the highest average low temperature is August (49.3°F).
The coldest month (with the lowest average low temperature) is February (37.4°F).
Average pressure in September
Sitkum, OR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in September
Sitkum, OR
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is March (6.2mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Sitkum, OR
- Average humidity in September: 78%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are July, August and September (78%).
Average rainfall in September
Sitkum, OR
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is December (5.12").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Sitkum, OR
- Average rainfall days in September: 6.7 days
The month with the highest number of rainy days is March (19.1 days).
The month with the least rainy days is August (3.3 days).
Average snowfall in September
Sitkum, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.1").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Sitkum, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.7 days).
The months with the least snowfall days are April, May, June, July, August, September, October and December (0 days).
Average daylight in September /
Average sunshine in September
Sitkum, OR
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 42min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 36min).
Average sunshine days in September
Sitkum, OR
- Average sunshine days in September: 21.5 days
The month with the most sunshine days is August (25.3 days).
The month with the least sunshine days is February (10.5 days).
Average UV index in September
Sitkum, OR
- 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 February, November and December (UV index 2).
Average cloud cover in September
Sitkum, OR
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in September
Sitkum, OR
- Average visibility in September: 4mi
The months with the highest visibility are January, February, March, April, May, October, November and December (5mi).
The months with the lowest visibility are June, July, August and September (4mi).
