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 onset of September comes with a shift in the average high-temperature, falling from a warm 84°F (28.9°C) in August to an agreeable 72.7°F (22.6°C). Deer Park observes a substantial disparity between daytime high and the average low-temperature of 46.6°F (8.1°C) during September nights.Humidity
The average relative humidity in September is 53%.Rainfall
In September, the rain falls for 7 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. In Deer Park, during the entire year, the rain falls for 124.9 days and collects up to 17.44" (443mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.51" (13mm) of snow. In Deer Park, during the entire year, snow falls for 69.2 days and aggregates up to 42.99" (1092mm) of snow.Daylight
The average length of the day in September in Deer Park is 12h and 33min.On the first day of the month, sunrise is at 6:09 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:30 pm PDT.
Sunshine
In September, the average sunshine in Deer Park is 10.1h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
What is the average September temperature in Deer Park?
What is the average humidity in September in Deer Park?
How many days does it rain in September in Deer Park?
When does it start snowing in Deer Park?
What is the average length of the day in September in Deer Park?
When is the sunrise / sunset in September in Deer Park?
How long on average sun shines in September in Deer Park?
What is the UV index intensity in September in Deer Park?
Average temperature in September
Deer Park, WA
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is August (84°F).
The month with the lowest average high temperature is December (31.3°F).
- Average low temperature in September: 46.6°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).
Average pressure in September
Deer Park, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in September
Deer Park, WA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (5.6mph).
The calmest month (with the lowest average wind speed) is December (4mph).
Average humidity in September
Deer Park, WA
- Average humidity in September: 53%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Deer Park, WA
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is January (2.4").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in September
Deer Park, WA
- Average rainfall days in September: 7 days
The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is August (5.1 days).
Average snowfall in September
Deer Park, WA
- Average snowfall in September: 0.51"
The month with the highest snowfall is January (13.23").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Deer Park, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Deer Park, WA
- Average daylight in September: 12h and 4min
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: 10h and 1min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Deer Park, WA
- Average sunshine days in September: 21.3 days
The month with the most sunshine days is July (24.2 days).
The month with the least sunshine days is March (9.7 days).
Average UV index in September
Deer Park, 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 February, November and December (UV index 1).
Average cloud cover in September
Deer Park, WA
- Average cloud cover in September: 22
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Deer Park, WA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
Deer Park, Washington, USA
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