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
With September's onset, the weather shows a temperature decrease, transitioning from a warm 83.5°F (28.6°C) in August to an agreeable 72.5°F (22.5°C). Four Lakes throughout September, experiences an average nighttime temperature of 51.4°F (10.8°C).Humidity
In Four Lakes, the average relative humidity in September is 47%.Rainfall
In Four Lakes, during September, the rain falls for 5.2 days and regularly aggregates up to 0.35" (9mm) of precipitation. In Four Lakes, during the entire year, the rain falls for 78.7 days and collects up to 7.72" (196mm) 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 0.2 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, there are 37.4 snowfall days, and 15.75" (400mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 33min.On the first day of the month, sunrise is at 6:10 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:30 pm PDT.
Sunshine
In Four Lakes, the average sunshine in September is 10.3h.UV index
In Four Lakes, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Take necessary precautions - Suggestions to elude sunburn are provided. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Four Lakes in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
How many hours of daylight does Four Lakes have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Four Lakes, WA
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (32°F).
- Average low temperature in September: 51.4°F
The month with the highest average low temperature is August (59.7°F).
The coldest month (with the lowest average low temperature) is December (22.5°F).
Average pressure in September
Four Lakes, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed in September
Four Lakes, WA
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Four Lakes, WA
- Average humidity in September: 47%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (38%).
Average rainfall in September
Four Lakes, WA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is May (1.06").
The driest months (with the least rainfall) are July and August (0.28").
Average rainfall days in September
Four Lakes, WA
- Average rainfall days in September: 5.2 days
The month with the highest number of rainy days is April (9.6 days).
The month with the least rainy days is February (3.2 days).
Average snowfall in September
Four Lakes, WA
- Average snowfall in September: 0.16"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Four Lakes, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (9.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Four Lakes, 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 2min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in September
Four Lakes, WA
- Average sunshine days in September: 23.5 days
The month with the most sunshine days is July (25.5 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in September
Four Lakes, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Four Lakes, WA
- Average cloud cover in September: 20
The months with the most cloud cover are January and December (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Four Lakes, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Four Lakes, Washington, USA
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