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 onset of September brings a small change in high-temperatures, falling from a hot 86.2°F (30.1°C) in August to a warm 75.4°F (24.1°C). September brings with it a nighttime average temperature of 54.9°F (12.7°C).Humidity
In Outlook, Washington, the average relative humidity in September is 46%.Rainfall
In September, in Outlook, Washington, the rain falls for 5.5 days. Throughout September, 0.35" (9mm) of precipitation is accumulated. In Outlook, Washington, during the entire year, the rain falls for 104.5 days and collects up to 8.23" (209mm) of precipitation.Snowfall
January through March, September, November and December are months with snowfall in Outlook. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5mm) of snow. In Outlook, during the entire year, snow falls for 15.6 days and aggregates up to 7.36" (187mm) of snow.Daylight
In September, the average length of the day in Outlook, Washington, is 12h and 32min.On the first day of September, sunrise is at 6:21 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:41 pm PDT.
Sunshine
The average sunshine in September is 10.7h.UV index
The average daily maximum UV index in September in Outlook is 4. 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 4 in September interprets into the following recommendations:
Make use of precautions - It is urged to ward off sun damage. To protect against the Sun's most potent rays, avoid direct exposure around midday. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Outlook?
What is the average humidity in September in Outlook?
How many days does it rain in September in Outlook?
When does it start to snow in Outlook?
What is the average length of the day in September in Outlook?
When are sunrise and sunset in September in Outlook?
How many hours of sunshine does Outlook have in September?
How high is the UV index in September in Outlook?
Average temperature in September
Outlook, WA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (36.1°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (25.3°F).
Average pressure in September
Outlook, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in September
Outlook, WA
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is December (5mph).
Average humidity in September
Outlook, WA
- Average humidity in September: 46%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (38%).
Average rainfall in September
Outlook, WA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Outlook, WA
- Average rainfall days in September: 5.5 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (4.1 days).
Average snowfall in September
Outlook, WA
- Average snowfall in September: 0.2"
The month with the highest snowfall is December (2.24").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in September
Outlook, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (5 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Outlook, WA
- Average daylight in September: 12h and 3min
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 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in September
Outlook, WA
- Average sunshine days in September: 22.6 days
The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is March (15.4 days).
Average UV index in September
Outlook, WA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Outlook, WA
- Average cloud cover in September: 17
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in September
Outlook, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Outlook, Washington, USA
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