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
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from 81.9°F (27.7°C) to a still moderately hot 73.8°F (23.2°C). The nighttime temperature during September displays a significant divergence from daily peaks, averaging at a fresh 50.2°F (10.1°C).Humidity
In Jefferson, the average relative humidity in September is 72%.Rainfall
In Jefferson, during September, the rain falls for 9.6 days and regularly aggregates up to 1.34" (34mm) of precipitation. In Jefferson, during the entire year, the rain falls for 164.2 days and collects up to 26.97" (685mm) of precipitation.Snowfall
April through October are months without snowfall in Jefferson.Daylight
In September, the average length of the day is 12h and 30min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:48 pm. On the last day of September, in Jefferson, sunrise is at 7:09 am and sunset at 6:53 pm PDT.
Sunshine
In September, the average sunshine in Jefferson is 9.4h.UV index
The average daily maximum UV index in September in Jefferson is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Frequently asked questions
What is the average September temperature in Jefferson?
What is the average humidity in September in Jefferson?
How much does it rain in Jefferson in September?
When it does not snow in Jefferson?
How many hours of daylight does Jefferson have in September?
When are sunrise and sunset in September in Jefferson?
How long on average sun shines in September in Jefferson?
What is the UV index reading in September in Jefferson?
Average temperature in September
Jefferson, OR
- Average high temperature in September: 73.8°F
The warmest month (with the highest average high temperature) is August (81.9°F).
The month with the lowest average high temperature is December (45.5°F).
- Average low temperature in September: 50.2°F
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is December (34.5°F).
Average pressure in September
Jefferson, 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
Jefferson, OR
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Jefferson, OR
- Average humidity in September: 72%
The months with the highest relative humidity are February and December (87%).
The month with the lowest relative humidity is August (66%).
Average rainfall in September
Jefferson, OR
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is December (3.98").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Jefferson, OR
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is August (3.9 days).
Average snowfall in September
Jefferson, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Jefferson, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.9 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
Jefferson, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- 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 6min).
Average sunshine days in September
Jefferson, OR
- Average sunshine days in September: 19.1 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (9 days).
Average UV index in September
Jefferson, 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
Jefferson, OR
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in September
Jefferson, OR
- Average visibility in September: 6mi
The months with the highest visibility are July, August and September (6mi).
The month with the lowest visibility is February (4mi).
Jefferson, Oregon, USA
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