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
With the onset of September, Wilsonville experiences a modest temperature adjustment, with the average high-temperature gently receding from a moderately hot 81°F (27.2°C) in August to a pleasant 73.2°F (22.9°C). The nighttime temperature during September displays a significant divergence from daily peaks, averaging at a fresh 50.9°F (10.5°C).Humidity
In September, the average relative humidity is 70%.Rainfall
In Wilsonville, in September, it is raining for 9.9 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, in Wilsonville, there are 173.8 rainfall days, and 29.96" (761mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Wilsonville.Daylight
The average length of the day in September is 12h and 31min.On the first day of September in Wilsonville, sunrise is at 6:33 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:52 pm PDT.
Sunshine
In Wilsonville, the average sunshine in September is 9.4h.UV index
In Wilsonville, Oregon, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A maximum UV index of 4 in September translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Frequently asked questions
What are September temperatures in Wilsonville?
What is the average humidity in September in Wilsonville?
How many days does it rain in September in Wilsonville?
When it does not snow in Wilsonville?
What is the average length of the day in September in Wilsonville?
What time are sunrise and sunset in September in Wilsonville?
How many hours of sunshine does Wilsonville have in September?
How high is the UV index in September in Wilsonville?
Average temperature in September
Wilsonville, OR
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (44.2°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).
Average pressure in September
Wilsonville, OR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in September
Wilsonville, OR
- Average wind speed in September: 4mph
The windiest months (with the highest average wind speed) are January and February (5.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in September
Wilsonville, OR
- Average humidity in September: 70%
The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is August (65%).
Average rainfall in September
Wilsonville, OR
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is December (4.49").
The driest months (with the least rainfall) are July and August (0.31").
Average rainfall days in September
Wilsonville, OR
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is March (20.9 days).
The months with the least rainy days are July and August (4.4 days).
Average snowfall in September
Wilsonville, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.26").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Wilsonville, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 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
Wilsonville, 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 2min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in September
Wilsonville, OR
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is July (25 days).
The month with the least sunshine days is March (8.3 days).
Average UV index in September
Wilsonville, 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
Wilsonville, OR
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in September
Wilsonville, 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).
Wilsonville, Oregon, USA
Weather forecast for your location
2. Allow the app to use your location
