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 shift from August to September coincides with a small decrease in the average high-temperature, down to an agreeable 70.7°F (21.5°C) from a warm 78.4°F (25.8°C). With a notable disparity from daily peak temperatures, the average low-temperature settles at a chilly 49.1°F (9.5°C) throughout September.Humidity
The average relative humidity in September is 75%.Rainfall
In September, the rain falls for 12.3 days. Throughout September, 1.57" (40mm) of precipitation is accumulated. In Spanaway, during the entire year, the rain falls for 176.3 days and collects up to 30.28" (769mm) of precipitation.Snowfall
May through October are months without snowfall in Spanaway.Daylight
In September, the average length of the day in Spanaway is 12h and 32min.On the first day of September, sunrise is at 6:30 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:50 pm PDT.
Sunshine
In Spanaway, the average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: An average UV index of 4 in September transforms into this advice:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's radiation is especially intense around midday; try to stay in shade during this period. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Spanaway have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Spanaway have in September?
How high is the UV index in September?
Average temperature in September
Spanaway, WA
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is February (34.2°F).
Average pressure in September
Spanaway, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in September
Spanaway, WA
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is March (5.2mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
Spanaway, WA
- Average humidity in September: 75%
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Spanaway, WA
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is December (4.76").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Spanaway, WA
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is March (19.9 days).
The month with the least rainy days is August (5.1 days).
Average snowfall in September
Spanaway, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Spanaway, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.4 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
Spanaway, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).
Average sunshine days in September
Spanaway, WA
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is August (23.3 days).
The months with the least sunshine days are February and March (9 days).
Average UV index in September
Spanaway, WA
- 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
Spanaway, WA
- Average cloud cover in September: 37
The months with the most cloud cover are January and December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Spanaway, WA
- Average visibility in September: 5mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February, March, April, May, June, September, October, November and December (5mi).
Spanaway, Washington, USA
Weather forecast for your location
2. Allow the app to use your location