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 subtly indicates a reduction in the average high-temperature, down to a pleasant 68.7°F (20.4°C) from August's moderately hot 74.8°F (23.8°C). The average low-temperature of 50°F (10°C) is witnessed in Lake Forest Park during September.Humidity
In Lake Forest Park, the average relative humidity in September is 76%.Rainfall
In Lake Forest Park, during September, the rain falls for 12.5 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, there are 166.9 rainfall days, and 21.93" (557mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Lake Forest Park.Daylight
In September, the average length of the day is 12h and 33min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:49 pm PDT.
Sunshine
In Lake Forest Park, the average sunshine in September is 9.4h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: An average maximum UV index of 3 in September leads to these recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Frequently asked questions
What are September temperatures in Lake Forest Park?
What is the average humidity in September in Lake Forest Park?
How many days does it rain in September in Lake Forest Park?
When it does not snow in Lake Forest Park?
How many hours of daylight does Lake Forest Park have in September?
When is the sunrise / sunset in September in Lake Forest Park?
How long on average sun shines in September in Lake Forest Park?
What is the UV index reading in September in Lake Forest Park?
Average temperature in September
Lake Forest Park, WA
- Average high temperature in September: 68.7°F
The warmest month (with the highest average high temperature) is August (74.8°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in September: 50°F
The month with the highest average low temperature is August (53.1°F).
The coldest months (with the lowest average low temperature) are February and December (35.1°F).
Average pressure in September
Lake Forest Park, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in September
Lake Forest Park, WA
- Average wind speed in September: 3.8mph
The windiest months (with the highest average wind speed) are January and March (5.3mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in September
Lake Forest Park, WA
- Average humidity in September: 76%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (71%).
Average rainfall in September
Lake Forest Park, WA
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is January (2.87").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in September
Lake Forest Park, WA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is November (17.9 days).
The month with the least rainy days is August (6.9 days).
Average snowfall in September
Lake Forest Park, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.42").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Lake Forest Park, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.5 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
Lake Forest Park, 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: 9h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 24min).
Average sunshine days in September
Lake Forest Park, WA
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is April (10.5 days).
Average UV index in September
Lake Forest Park, WA
- Average UV index in September: 3
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
Lake Forest Park, WA
- Average cloud cover in September: 32
The months with the most cloud cover are January and December (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in September
Lake Forest Park, WA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).
Lake Forest Park, Washington, USA
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