September weather forecastWeston, OR
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Weston, Oregon, with an average temperature fluctuating between 48.2°F (9°C) and 71.1°F (21.7°C).Temperature
With the onset of September, Weston's average high-temperature adjusts, receding from August's warm 80.6°F (27°C) to a pleasant 71.1°F (21.7°C). Weston observes a dramatic plunge from daytime highs in September, settling at an average low-temperature of 48.2°F (9°C).Humidity
In September, the average relative humidity is 53%.Rainfall
In Weston, in September, during 7.2 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Weston, during the entire year, the rain falls for 127.6 days and collects up to 24.33" (618mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.39" (10mm) of snow. In Weston, during the entire year, snow falls for 84.8 days and aggregates up to 74.33" (1888mm) of snow.Daylight
The average length of the day in September is 12h and 31min.On the first day of September in Weston, sunrise is at 6:15 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:34 pm PDT.
Sunshine
In Weston, the average sunshine in September is 10.3h.UV index
The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Weston, OR
- Average high temperature in September: 71.1°F
The warmest month (with the highest average high temperature) is August (80.6°F).
The month with the lowest average high temperature is December (34.5°F).
- Average low temperature in September: 48.2°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (22.3°F).
Average pressure in September
Weston, 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
Weston, OR
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is March (6.7mph).
The calmest month (with the lowest average wind speed) is September (4.9mph).
Average humidity in September
Weston, OR
- Average humidity in September: 53%
The months with the highest relative humidity are January, February and December (84%).
The month with the lowest relative humidity is August (44%).
Average rainfall in September
Weston, OR
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is February (3.23").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Weston, OR
- Average rainfall days in September: 7.2 days
The month with the highest number of rainy days is March (15.9 days).
The month with the least rainy days is August (4.8 days).
Average snowfall in September
Weston, OR
- Average snowfall in September: 0.39"
The month with the highest snowfall is February (19.21").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Weston, OR
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (17.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Weston, OR
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 18min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 36min).
Average sunshine days in September
Weston, OR
- Average sunshine days in September: 21.5 days
The month with the most sunshine days is July (24.5 days).
The months with the least sunshine days are February and March (8.2 days).
Average UV index in September
Weston, 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, April, November and December (UV index 2).
Average cloud cover in September
Weston, OR
- Average cloud cover in September: 19
The month with the most cloud cover is February (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Weston, OR
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
