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 is characterized by a mild reduction in the average high-temperature, from a moderately hot 81°F (27.2°C) in August to a still warm 74.8°F (23.8°C). The average low-temperature of 44.4°F (6.9°C) in September represents a significant drop from the daily high.Humidity
The average relative humidity in September is 74%.Rainfall
In Winston, during September, the rain falls for 6.6 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Winston, during the entire year, the rain falls for 148.4 days and collects up to 25" (635mm) of precipitation.Snowfall
In Winston, snow does not fall in April through October.Daylight
In September, the average length of the day in Winston is 12h and 29min.On the first day of September, sunrise is at 6:38 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:55 pm PDT.
Sunshine
The average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 3 in September interprets into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
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 it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Winston have in September?
How high is the UV index in September?
Average temperature in September
Winston, OR
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (46.2°F).
- Average low temperature in September: 44.4°F
The month with the highest average low temperature is August (47.5°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).
Average pressure in September
Winston, OR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in September
Winston, OR
- Average wind speed in September: 3.2mph
The windiest month (with the highest average wind speed) is January (4mph).
The calmest months (with the lowest average wind speed) are September and October (3.2mph).
Average humidity in September
Winston, OR
- Average humidity in September: 74%
The months with the highest relative humidity are February and December (87%).
The months with the lowest relative humidity are July and August (71%).
Average rainfall in September
Winston, OR
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is December (3.74").
The driest month (with the least rainfall) is August (0.2").
Average rainfall days in September
Winston, OR
- Average rainfall days in September: 6.6 days
The month with the highest number of rainy days is March (19.4 days).
The month with the least rainy days is July (3.5 days).
Average snowfall in September
Winston, 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
Winston, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 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
Winston, OR
- Average daylight in September: 12h and 3min
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 3min
The months with the most sunshine are July and August (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in September
Winston, OR
- Average sunshine days in September: 21.3 days
The month with the most sunshine days is August (26.2 days).
The month with the least sunshine days is March (9.7 days).
Average UV index in September
Winston, 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, March, November and December (UV index 2).
Average cloud cover in September
Winston, OR
- Average cloud cover in September: 35
The month with the most cloud cover is March (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Winston, OR
- Average visibility in September: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
Winston, Oregon, USA
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