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
The arrival of September corresponds with a minor reduction in the average high-temperature, down from August's warm 77.7°F (25.4°C) to a pleasant 70.7°F (21.5°C). Despite a noticeable differential from daytime highs, Sandy notes an average nighttime low-temperature of 48°F (8.9°C) in September.Humidity
In Sandy, Oregon, the average relative humidity in September is 71%.Rainfall
In September, in Sandy, the rain falls for 10.5 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. Throughout the year, there are 172.1 rainfall days, and 37.95" (964mm) of precipitation is accumulated.Snowfall
In Sandy, snow does not fall in June through October.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:31 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:50 pm PDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In Sandy, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 4 during September leads to these instructions:
Be vigilant - Suggestions to stave off sun damage are provided. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September in Sandy?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Sandy have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Sandy have in September?
How high is the UV index in September?
Average temperature in September
Sandy, OR
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (41.5°F).
- Average low temperature in September: 48°F
The month with the highest average low temperature is August (51.1°F).
The coldest month (with the lowest average low temperature) is December (32°F).
Average pressure in September
Sandy, OR
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in September
Sandy, OR
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is January (6.6mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in September
Sandy, OR
- Average humidity in September: 71%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (66%).
Average rainfall in September
Sandy, OR
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is December (5.91").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in September
Sandy, OR
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is March (19.4 days).
The month with the least rainy days is July (5.2 days).
Average snowfall in September
Sandy, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.34").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Sandy, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (6.9 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Sandy, 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 1min
The months with the most sunshine are July and August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Sandy, OR
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is July (23.7 days).
The month with the least sunshine days is February (8.2 days).
Average UV index in September
Sandy, OR
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Sandy, OR
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Sandy, OR
- Average visibility in September: 5mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, September, October, November and December (5mi).
Sandy, Oregon, USA
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