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 transition into September is accompanied by a temperature decrease, with the average high-temperature shifting from a hot 86.7°F (30.4°C) in August to a warm 75.2°F (24°C). The nighttime temperature in Soap Lake dips to a cool 54.1°F (12.3°C) on average during September.Humidity
The average relative humidity in September is 45%.Rainfall
In September, in Soap Lake, the rain falls for 5.4 days. Throughout September, 0.35" (9mm) of precipitation is accumulated. Throughout the year, there are 95.2 rainfall days, and 7.91" (201mm) of precipitation is accumulated.Snowfall
January through April, September, November and December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 23.5 snowfall days, and 11.38" (289mm) of snow is accumulated.Daylight
In Soap Lake, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:37 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:38 pm PDT.
Sunshine
In Soap Lake, the average sunshine in September is 10.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A daily high UV index of 4 in September leads to these guidelines:
Exercise prevention - Warding off sunburn is urged. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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 does it start to snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Soap Lake have in September?
What is the UV index intensity in September?
Average temperature in September
Soap Lake, WA
- Average high temperature in September: 75.2°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 (33.4°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.2°F).
Average pressure in September
Soap Lake, 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 (29.91"Hg).
Average wind speed in September
Soap Lake, WA
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest months (with the lowest average wind speed) are January and December (5.3mph).
Average humidity in September
Soap Lake, WA
- Average humidity in September: 45%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are July and August (37%).
Average rainfall in September
Soap Lake, WA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is January (1.02").
The driest month (with the least rainfall) is August (0.24").
Average rainfall days in September
Soap Lake, WA
- Average rainfall days in September: 5.4 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (4.2 days).
Average snowfall in September
Soap Lake, WA
- Average snowfall in September: 0.12"
The month with the highest snowfall is December (3.98").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in September
Soap Lake, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (7.8 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Soap Lake, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 10h and 5min
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 30min).
Average sunshine days in September
Soap Lake, WA
- Average sunshine days in September: 23.3 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is March (15.6 days).
Average UV index in September
Soap Lake, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Soap Lake, WA
- Average cloud cover in September: 17
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Soap Lake, 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 month with the lowest visibility is January (4mi).
Soap Lake, Washington, USA
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