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
In September, the average high-temperature goes from a moderately hot 81.1°F (27.3°C) in August to an agreeable 71.6°F (22°C). The nighttime temperature during September exhibits a clear drop from daytime highs, settling at a frosty 45.1°F (7.3°C).Humidity
In September, the average relative humidity is 54%.Rainfall
In September, the rain falls for 6.5 days. Throughout September, 0.67" (17mm) of precipitation is accumulated. Throughout the year, there are 137.5 rainfall days, and 20.94" (532mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, there are 68.6 snowfall days, and 52.4" (1331mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:14 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:33 pm PDT.
Sunshine
In September, the average sunshine is 10.4h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 3 during September translates into these guidelines:
Guard yourself - Precautionary measures against sun damage are advocated. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Summerville have in September?
How high is the UV index in September?
Average temperature in September
Summerville, OR
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (33.8°F).
- Average low temperature in September: 45.1°F
The month with the highest average low temperature is August (51.4°F).
The coldest month (with the lowest average low temperature) is December (21°F).
Average pressure in September
Summerville, OR
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
Summerville, OR
- Average wind speed in September: 4.3mph
The windiest month (with the highest average wind speed) is January (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in September
Summerville, OR
- Average humidity in September: 54%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (47%).
Average rainfall in September
Summerville, OR
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is January (2.99").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Summerville, OR
- Average rainfall days in September: 6.5 days
The month with the highest number of rainy days is March (17.8 days).
The month with the least rainy days is August (4.3 days).
Average snowfall in September
Summerville, OR
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (13.62").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Summerville, OR
- Average snowfall days in September: 0.2 days
The months with the highest number of snowfall days are February and December (14.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Summerville, 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: 10h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Summerville, OR
- Average sunshine days in September: 21.8 days
The month with the most sunshine days is August (24.3 days).
The month with the least sunshine days is March (7.6 days).
Average UV index in September
Summerville, OR
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Summerville, OR
- Average cloud cover in September: 19
The month with the most cloud cover is February (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Summerville, OR
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is February (4mi).
Summerville, Oregon, USA
Weather forecast for your location
2. Allow the app to use your location