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
September shows a mild decline in the average high-temperature, falling from August's moderately hot 78.4°F (25.8°C) to a pleasant 68.9°F (20.5°C). Dee experiences a significant reduction from daytime highs with an average low-temperature of 47.1°F (8.4°C) in September.Humidity
The average relative humidity in September is 66%.Rainfall
In Dee, in September, it is raining for 9.2 days, with typically 1.14" (29mm) of accumulated precipitation. Throughout the year, there are 159.7 rainfall days, and 31.42" (798mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Dee.Daylight
In September, the average length of the day in Dee is 12h and 31min.On the first day of September, sunrise is at 6:28 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:47 pm PDT.
Sunshine
The average sunshine in September is 9.9h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, the average maximum UV index of 3 translates into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
What is the average September temperature in Dee?
What is the average humidity in September in Dee?
How many days does it rain in September in Dee?
When it does not snow in Dee?
How many hours of daylight does Dee have in September?
When is the sunrise / sunset in September in Dee?
How many hours of sunshine does Dee have in September?
What is the UV index reading in September in Dee?
Average temperature in September
Dee, OR
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (36°F).
- Average low temperature in September: 47.1°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 (27°F).
Average pressure in September
Dee, OR
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in September
Dee, OR
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is June (6.1mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in September
Dee, OR
- Average humidity in September: 66%
The months with the highest relative humidity are February and December (88%).
The month with the lowest relative humidity is July (59%).
Average rainfall in September
Dee, OR
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is January (5.67").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in September
Dee, OR
- Average rainfall days in September: 9.2 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is August (4.2 days).
Average snowfall in September
Dee, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.76").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Dee, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (4.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Dee, 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 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Dee, OR
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is July (25.4 days).
The month with the least sunshine days is March (8.4 days).
Average UV index in September
Dee, OR
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in September
Dee, OR
- Average cloud cover in September: 29
The months with the most cloud cover are January and February (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 17).
Average visibility in September
Dee, OR
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (4mi).
Dee, Oregon, USA
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