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 in Lynnwood correlates with a minor temperature reduction, down from August's warm 73.9°F (23.3°C) to a comfortable 67.6°F (19.8°C). During September, the average low-temperature is a cool 51.6°F (10.9°C).Humidity
In Lynnwood, Washington, the average relative humidity in September is 76%.Rainfall
In Lynnwood, in September, it is raining for 11.9 days, with typically 1.42" (36mm) of accumulated precipitation. Throughout the year, there are 173 rainfall days, and 25" (635mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Lynnwood.Daylight
The average length of the day in September is 12h and 33min.On the first day of September in Lynnwood, sunrise is at 6:28 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:49 pm PDT.
Sunshine
In September, the average sunshine in Lynnwood is 9.5h.UV index
In Lynnwood, Washington, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Undertake protective steps - Recommendations to avoid sunburn are issued. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Frequently asked questions
What are the temperatures in Lynnwood in September?
What is the average humidity in September in Lynnwood?
How many days does it rain in September in Lynnwood?
When it does not snow in Lynnwood?
What is the average length of the day in September in Lynnwood?
When is the sunrise / sunset in September in Lynnwood?
How many hours of sunshine does Lynnwood have in September?
What is the UV index reading in September in Lynnwood?
Average temperature in September
Lynnwood, WA
- Average high temperature in September: 67.6°F
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is December (43.3°F).
- Average low temperature in September: 51.6°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (35.8°F).
Average pressure in September
Lynnwood, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in September
Lynnwood, WA
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is November (5.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in September
Lynnwood, WA
- Average humidity in September: 76%
The months with the highest relative humidity are January, February and December (84%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Lynnwood, WA
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is December (3.5").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Lynnwood, WA
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in September
Lynnwood, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Lynnwood, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.7 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
Lynnwood, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Lynnwood, WA
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is August (22.5 days).
The month with the least sunshine days is November (9.2 days).
Average UV index in September
Lynnwood, WA
- 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
Lynnwood, WA
- Average cloud cover in September: 32
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Lynnwood, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Lynnwood, Washington, USA
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